diff --git a/README.MD b/README.MD
index 76b6205..8325c95 100644
--- a/README.MD
+++ b/README.MD
@@ -221,7 +221,36 @@ v.isFieldValid(document.getElementById('field'), true, myCallbackFn)
 ```
 
 ## Hidden fields validation
+
 By default validation is skipped for hidden fields. To enable validation for hidden fields validation use:
 ```ts
 v.allowHiddenFields = true;
+```
+
+## Monitoring the DOM for changes
+
+If configured, aspnet-client-validation can monitor the DOM for changes using [`MutationObserver`](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver), if the browser supports it.
+As new elements are added/modified, the library will automatically wire up validation directives found.
+This can be very useful when using frameworks that modify the DOM, such as [Turbo](http://turbo.hotwired.dev).
+To configure this, set the `watch` option to `true` when calling `bootstrap`:
+
+```js
+let v = new aspnetValidation.ValidationService();
+v.bootstrap({ watch: true });
+```
+
+## Logging
+
+There is a rudimentary logging infrastructure in place if you want to get more insight into what the library is doing.
+To enable logging, pass an object that implements the `Logger` interface (see below) in to the `ValidationService` constructor.
+The `window.console` object satisfies this interface automatically:
+
+```typescript
+// The Logger interface, for reference
+export interface Logger {
+    log(message: string, ...args: any[]): void;
+}
+
+let v = new aspnetValidation.ValidationService(console);
+v.bootstrap();
 ```
\ No newline at end of file
diff --git a/dist/aspnet-validation.js b/dist/aspnet-validation.js
index 189549d..45f98b4 100644
--- a/dist/aspnet-validation.js
+++ b/dist/aspnet-validation.js
@@ -143,6 +143,17 @@ var __generator = (undefined && undefined.__generator) || function (thisArg, bod
         if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
     }
 };
+var nullLogger = new (/** @class */ (function () {
+    function class_1() {
+    }
+    class_1.prototype.log = function (_) {
+        var args = [];
+        for (var _i = 1; _i < arguments.length; _i++) {
+            args[_i - 1] = arguments[_i];
+        }
+    };
+    return class_1;
+}()))();
 /**
  * Resolves and returns the element referred by original element using ASP.NET selector logic.
  * @param elementName
@@ -396,7 +407,7 @@ var MvcValidationProviders = /** @class */ (function () {
  * Responsibles for managing the DOM elements and running the validation providers.
  */
 var ValidationService = /** @class */ (function () {
-    function ValidationService() {
+    function ValidationService(logger) {
         var _this = this;
         /**
          * A key-value collection of loaded validation plugins.
@@ -500,6 +511,7 @@ var ValidationService = /** @class */ (function () {
             var fieldUID = _this.getElementUID(field);
             return _this.summary[fieldUID] != null;
         };
+        this.logger = logger || nullLogger;
     }
     /**
      * Registers a new validation plugin of the given name, if not registered yet.
@@ -513,6 +525,7 @@ var ValidationService = /** @class */ (function () {
             // Allows developers to override the default MVC Providers by adding custom providers BEFORE bootstrap() is called!
             return;
         }
+        this.logger.log("Registered provider: " + name);
         this.providers[name] = callback;
     };
     /**
@@ -546,8 +559,13 @@ var ValidationService = /** @class */ (function () {
     /**
      * Scans document for all validation message <span> generated by ASP.NET Core MVC, then tracks them.
      */
-    ValidationService.prototype.scanMessages = function () {
-        var validationMessageElements = document.querySelectorAll('[data-valmsg-for]');
+    ValidationService.prototype.scanMessages = function (root) {
+        var validationMessageElements = Array.from(root.querySelectorAll('[data-valmsg-for]'));
+        // querySelectorAll does not include the root element itself.
+        // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.
+        if (root.hasAttribute("data-valmsg-for")) {
+            validationMessageElements.push(root);
+        }
         for (var i = 0; i < validationMessageElements.length; i++) {
             var e = validationMessageElements[i];
             var name_1 = e.getAttribute('data-valmsg-for');
@@ -767,8 +785,13 @@ var ValidationService = /** @class */ (function () {
     /**
      * Scans the entire document for input elements to be validated.
      */
-    ValidationService.prototype.scanInputs = function () {
-        var inputs = document.querySelectorAll('[data-val="true"]');
+    ValidationService.prototype.scanInputs = function (root) {
+        var inputs = Array.from(root.querySelectorAll('[data-val="true"]'));
+        // querySelectorAll does not include the root element itself.
+        // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.
+        if (root.getAttribute("data-val") === "true") {
+            inputs.push(root);
+        }
         for (var i = 0; i < inputs.length; i++) {
             var input = inputs[i];
             this.addInput(input);
@@ -882,6 +905,7 @@ var ValidationService = /** @class */ (function () {
                             console.log('aspnet-validation provider not implemented: ' + key);
                             return [3 /*break*/, 6];
                         }
+                        this.logger.log("Running " + key + " validator on element", input);
                         result = provider(input.value, input, directive.params);
                         valid = false;
                         error = directive.error;
@@ -930,23 +954,67 @@ var ValidationService = /** @class */ (function () {
     };
     /**
      * Load default validation providers and scans the entire document when ready.
+     * @param options.watch If set to true, a MutationObserver will be used to continuously watch for new elements that provide validation directives.
      */
-    ValidationService.prototype.bootstrap = function () {
+    ValidationService.prototype.bootstrap = function (options) {
         var _this = this;
+        options = options || {};
+        options.root = options.root || window.document.body;
         this.addMvcProviders();
-        var document = window.document;
-        if (document.readyState === 'complete') {
-            this.scan();
+        // If the document is done loading, scan it now.
+        if (window.document.readyState !== 'loading') {
+            this.scan(options.root);
         }
         else {
+            // Otherwise wait until the document is done loading.
             window.document.addEventListener('DOMContentLoaded', function (event) {
-                _this.scan();
+                _this.scan(options.root);
             });
         }
+        // Watch for further mutations
+        if (options.watch) {
+            this.watch(options.root);
+        }
     };
-    ValidationService.prototype.scan = function () {
-        this.scanMessages();
-        this.scanInputs();
+    /**
+     * Scans the provided root element for any validation directives and attaches behavior to them.
+     */
+    ValidationService.prototype.scan = function (root) {
+        this.scanMessages(root);
+        this.scanInputs(root);
+    };
+    /**
+     * Watches the provided root element for mutations, and scans for new validation directives to attach behavior.
+     * @param root The root element to use, defaults to the document.documentElement.
+     */
+    ValidationService.prototype.watch = function (root) {
+        var _this = this;
+        this.observer = new MutationObserver(function (mutations) {
+            mutations.forEach(function (mutation) {
+                _this.observed(mutation);
+            });
+        });
+        this.observer.observe(root, {
+            attributes: true,
+            childList: true,
+            subtree: true
+        });
+        this.logger.log("Watching for mutations");
+    };
+    ValidationService.prototype.observed = function (mutation) {
+        if (mutation.type === 'childList') {
+            for (var i = 0; i < mutation.addedNodes.length; i++) {
+                var node = mutation.addedNodes[i];
+                if (node instanceof HTMLElement) {
+                    this.scan(node);
+                }
+            }
+        }
+        else if (mutation.type === 'attributes') {
+            if (mutation.target instanceof HTMLElement) {
+                this.scan(mutation.target);
+            }
+        }
     };
     return ValidationService;
 }());
diff --git a/dist/aspnet-validation.min.js b/dist/aspnet-validation.min.js
index 96a5dc9..28ff35d 100644
--- a/dist/aspnet-validation.min.js
+++ b/dist/aspnet-validation.min.js
@@ -1,2 +1,2 @@
-!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.aspnetValidation=t():e.aspnetValidation=t()}(window,(function(){return function(e){var t={};function r(n){if(t[n])return t[n].exports;var i=t[n]={i:n,l:!1,exports:{}};return e[n].call(i.exports,i,i.exports,r),i.l=!0,i.exports}return r.m=e,r.c=t,r.d=function(e,t,n){r.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:n})},r.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},r.t=function(e,t){if(1&t&&(e=r(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var i in e)r.d(n,i,function(t){return e[t]}.bind(null,i));return n},r.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return r.d(t,"a",t),t},r.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},r.p="",r(r.s=0)}([function(e,t,r){"use strict";r.r(t),r.d(t,"MvcValidationProviders",(function(){return o})),r.d(t,"ValidationService",(function(){return s}));var n=function(e,t,r,n){return new(r||(r=Promise))((function(i,a){function o(e){try{u(n.next(e))}catch(e){a(e)}}function s(e){try{u(n.throw(e))}catch(e){a(e)}}function u(e){var t;e.done?i(e.value):(t=e.value,t instanceof r?t:new r((function(e){e(t)}))).then(o,s)}u((n=n.apply(e,t||[])).next())}))},i=function(e,t){var r,n,i,a,o={label:0,sent:function(){if(1&i[0])throw i[1];return i[1]},trys:[],ops:[]};return a={next:s(0),throw:s(1),return:s(2)},"function"==typeof Symbol&&(a[Symbol.iterator]=function(){return this}),a;function s(a){return function(s){return function(a){if(r)throw new TypeError("Generator is already 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Boolean(e)},this.stringLength=function(e,t,r){if(!e)return!0;if(r.min){var n=parseInt(r.min);if(e.length<n)return!1}if(r.max){var i=parseInt(r.max);if(e.length>i)return!1}return!0},this.compare=function(e,t,r){if(!r.other)return!0;var n=a(t.name,r.other);return!n||n.value===e},this.range=function(e,t,r){if(!e)return!0;var n=parseFloat(e);return!isNaN(n)&&(!(r.min&&n<parseFloat(r.min))&&!(r.max&&n>parseFloat(r.max)))},this.regex=function(e,t,r){return!e||!r.pattern||new RegExp(r.pattern).test(e)},this.email=function(e,t,r){return!e||/^([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x22([^\x0d\x22\x5c\x80-\xff]|\x5c[\x00-\x7f])*\x22)(\x2e([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x22([^\x0d\x22\x5c\x80-\xff]|\x5c[\x00-\x7f])*\x22))*\x40([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x5b([^\x0d\x5b-\x5d\x80-\xff]|\x5c[\x00-\x7f])*\x5d)(\x2e([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x5b([^\x0d\x5b-\x5d\x80-\xff]|\x5c[\x00-\x7f])*\x5d))*(\.\w{2,})+$/.test(e)},this.creditcard=function(e,t,r){if(!e)return!0;if(/[^0-9 \-]+/.test(e))return!1;var n,i,a=0,o=0,s=!1;if((e=e.replace(/\D/g,"")).length<13||e.length>19)return!1;for(n=e.length-1;n>=0;n--)i=e.charAt(n),o=parseInt(i,10),s&&(o*=2)>9&&(o-=9),a+=o,s=!s;return a%10==0},this.url=function(e,t,r){if(!e)return!0;var n=e.toLowerCase();return n.indexOf("http://")>-1||n.indexOf("https://")>-1||n.indexOf("ftp://")>-1},this.phone=function(e,t,r){return!e||!/[\+\-\s][\-\s]/g.test(e)&&/^\+?[0-9\-\s]+$/.test(e)},this.remote=function(e,t,r){if(!e)return!0;for(var n=r.additionalfields.split(","),i={},o=0,s=n;o<s.length;o++){var u=s[o],l=u.substr(2),d=a(t.name,u);Boolean(d&&d.value)&&(i[l]=d.value)}var f=r.url,c=[];for(var l in i){var v=encodeURIComponent(l)+"="+encodeURIComponent(i[l]);c.push(v)}var m=c.join("&");return new Promise((function(e,t){var n=new XMLHttpRequest;if("Post"===r.type){var a=new FormData;for(var o in i)a.append(o,i[o]);n.open("post",f),n.setRequestHeader("Content-Type","application/x-www-form-urlencoded"),n.send(m)}else n.open("get",f+"?"+m),n.send();n.onload=function(r){if(n.status>=200&&n.status<300){var i=JSON.parse(n.responseText);e(i)}else t({status:n.status,statusText:n.statusText,data:n.responseText})},n.onerror=function(e){t({status:n.status,statusText:n.statusText,data:n.responseText})}}))}},s=function(){function e(){var e=this;this.providers={},this.messageFor={},this.elementUIDs=[],this.elementByUID={},this.formInputs={},this.validators={},this.elementEvents={},this.summary={},this.debounce=300,this.allowHiddenFields=!1,this.validateForm=function(t,r){var n=e.getElementUID(t),i=e.elementEvents[n];i&&i(null,r)},this.focusFirstInvalid=function(t){var r=e.getElementUID(t),n=e.formInputs[r].filter((function(t){return e.summary[t]}));if(n.length>0){var i=e.elementByUID[n[0]];i&&i.focus()}},this.isValid=function(t,r,n){void 0===r&&(r=!0),r&&e.validateForm(t,n);var i=e.getElementUID(t);return 0==e.formInputs[i].filter((function(t){return e.summary[t]})).length},this.isFieldValid=function(t,r,n){if(void 0===r&&(r=!0),r){var i=t.closest("form");null!=i&&e.validateForm(i,n)}var a=e.getElementUID(t);return null!=e.summary[a]}}return e.prototype.addProvider=function(e,t){this.providers[e]||(this.providers[e]=t)},e.prototype.addMvcProviders=function(){var e=new o;this.addProvider("required",e.required),this.addProvider("length",e.stringLength),this.addProvider("maxlength",e.stringLength),this.addProvider("minlength",e.stringLength),this.addProvider("equalto",e.compare),this.addProvider("range",e.range),this.addProvider("regex",e.regex),this.addProvider("creditcard",e.creditcard),this.addProvider("email",e.email),this.addProvider("url",e.url),this.addProvider("phone",e.phone),this.addProvider("remote",e.remote)},e.prototype.scanMessages=function(){for(var e=document.querySelectorAll("[data-valmsg-for]"),t=0;t<e.length;t++){var r=e[t],n=r.getAttribute("data-valmsg-for");this.messageFor[n]||(this.messageFor[n]=[]),this.messageFor[n].push(r)}},e.prototype.parseDirectives=function(e){for(var t={},r={},n="data-val-".length,i=0;i<e.length;i++){var a=e[i];if(0===a.name.indexOf("data-val-")){var o=a.name.substr(n);r[o]=a.value}}var s=function(e){if(-1===e.indexOf("-")){for(var n=Object.keys(r).filter((function(t){return t!==e&&0===t.indexOf(e)})),i={error:r[e],params:{}},a=(e+"-").length,o=0;o<n.length;o++){var s=r[n[o]],u=n[o].substr(a);i.params[u]=s}t[e]=i}};for(var o in r)s(o);return t},e.prototype.guid4=function(){return"xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g,(function(e){var t=16*Math.random()|0;return("x"==e?t:3&t|8).toString(16)}))},e.prototype.getElementUID=function(e){var t=this.elementUIDs.filter((function(t){return t.node===e}))[0];if(t)return t.uid;var r=this.guid4();return this.elementUIDs.push({node:e,uid:r}),this.elementByUID[r]=e,r},e.prototype.getFormValidationTask=function(e){var t=this.formInputs[e];if(!t||0===t.length)return null;for(var r=[],n=0;n<t.length;n++){var i=t[n];r.push(this.validators[i])}var a=r.map((function(e){return e()}));return Promise.all(a).then((function(e){return e.every((function(e){return e}))}))},e.prototype.shouldValidate=function(e){return!(null!==e&&e.submitter&&e.submitter.formNoValidate)},e.prototype.trackFormInput=function(e,t){var r=this,n=this.getElementUID(e);if(this.formInputs[n]||(this.formInputs[n]=[]),-1===this.formInputs[n].indexOf(t)&&this.formInputs[n].push(t),!this.elementEvents[n]){var i=function(t,i){if(r.shouldValidate(t)){var a=r.getFormValidationTask(n);a&&a.then((function(n){var a=!t;if(n){if(a)return void i(!0);var o=new CustomEvent("validation",{detail:{valid:!0}});e.dispatchEvent(o)}else{t&&(t.preventDefault(),t.stopImmediatePropagation());var s=new CustomEvent("validation",{detail:{valid:!1}});e.dispatchEvent(s),a?i(!1):r.focusFirstInvalid(e)}})).catch((function(e){console.log(e)}))}};e.addEventListener("submit",i),e.addEventListener("reset",(function(e){for(var t=0,i=r.formInputs[n];t<i.length;t++){var a=i[t],o=r.elementByUID[a];o.classList.remove("input-validation-error"),o.classList.remove("input-validation-valid");var s=r.messageFor[o.name];if(s)for(var u=0;u<s.length;u++)s[u].innerHTML="";delete r.summary[a]}r.renderSummary()})),this.elementEvents[n]=i}},e.prototype.addInput=function(e){var t=this,r=this.getElementUID(e),n=this.parseDirectives(e.attributes),i=this.createValidator(e,n);if(this.validators[r]=i,e.form&&this.trackFormInput(e.form,r),!this.elementEvents[r]){var a,o=function(e){var n=t.validators[r];clearTimeout(a),a=setTimeout(n,t.debounce)},s="select"===e.tagName.toLowerCase(),u=e.dataset.valEvent;s?e.addEventListener("change",o):u?e.addEventListener(u,o):e.addEventListener("input",o),this.elementEvents[r]=o}},e.prototype.scanInputs=function(){for(var e=document.querySelectorAll('[data-val="true"]'),t=0;t<e.length;t++){var r=e[t];this.addInput(r)}},e.prototype.createSummaryDOM=function(){if(!Object.keys(this.summary).length)return null;var e=document.createElement("ul");for(var t in this.summary){var r=document.createElement("li");r.innerHTML=this.summary[t],e.appendChild(r)}return e},e.prototype.renderSummary=function(){var e=document.querySelectorAll('[data-valmsg-summary="true"]');if(e.length){var t=JSON.stringify(this.summary,Object.keys(this.summary).sort());if(t!==this.renderedSummaryJSON){this.renderedSummaryJSON=t;for(var r=this.createSummaryDOM(),n=0;n<e.length;n++){var i=e[n];i.innerHTML="",r?(i.className="validation-summary-errors",i.appendChild(r.cloneNode(!0))):i.className="validation-summary-valid"}}}},e.prototype.addError=function(e,t){var r=this.messageFor[e.name];if(r)for(var n=0;n<r.length;n++)r[n].innerHTML=t,r[n].className="field-validation-error";e.classList.remove("input-validation-valid"),e.classList.add("input-validation-error");var i=this.getElementUID(e);this.summary[i]=t,this.renderSummary()},e.prototype.removeError=function(e){var t=this.messageFor[e.name];if(t)for(var r=0;r<t.length;r++)t[r].innerHTML="",t[r].className="field-validation-valid";e.classList.remove("input-validation-error"),e.classList.add("input-validation-valid");var n=this.getElementUID(e);delete this.summary[n],this.renderSummary()},e.prototype.createValidator=function(e,t){var r=this;return function(){return n(r,void 0,void 0,(function(){var r,n,a,o,s,u,l,d,f,c;return i(this,(function(i){switch(i.label){case 0:if(this.isHidden(e))return[3,7];for(n in r=[],t)r.push(n);a=0,i.label=1;case 1:return a<r.length?(o=r[a],s=t[o],(u=this.providers[o])?(l=u(e.value,e,s.params),d=!1,f=s.error,"boolean"!=typeof l?[3,2]:(d=l,[3,5])):(console.log("aspnet-validation provider not implemented: "+o),[3,6])):[3,7];case 2:return"string"!=typeof l?[3,3]:(d=!1,f=l,[3,5]);case 3:return[4,l];case 4:"boolean"==typeof(c=i.sent())?d=c:(d=!1,f=c),i.label=5;case 5:if(!d)return this.addError(e,f),[2,!1];i.label=6;case 6:return a++,[3,1];case 7:return this.removeError(e),[2,!0]}}))}))}},e.prototype.isHidden=function(e){return!(this.allowHiddenFields||e.offsetWidth||e.offsetHeight||e.getClientRects().length)},e.prototype.bootstrap=function(){var e=this;this.addMvcProviders(),"complete"===window.document.readyState?this.scan():window.document.addEventListener("DOMContentLoaded",(function(t){e.scan()}))},e.prototype.scan=function(){this.scanMessages(),this.scanInputs()},e}()}])}));
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i=t.substr(0,n)+"."+r,a=document.getElementsByName(i)[0];if(a)return a}return document.getElementsByName(r)[0]}var s=function(){this.required=function(t,e,r){return Boolean(t)},this.stringLength=function(t,e,r){if(!t)return!0;if(r.min){var n=parseInt(r.min);if(t.length<n)return!1}if(r.max){var i=parseInt(r.max);if(t.length>i)return!1}return!0},this.compare=function(t,e,r){if(!r.other)return!0;var n=o(e.name,r.other);return!n||n.value===t},this.range=function(t,e,r){if(!t)return!0;var n=parseFloat(t);return!isNaN(n)&&(!(r.min&&n<parseFloat(r.min))&&!(r.max&&n>parseFloat(r.max)))},this.regex=function(t,e,r){return!t||!r.pattern||new RegExp(r.pattern).test(t)},this.email=function(t,e,r){return!t||/^([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x22([^\x0d\x22\x5c\x80-\xff]|\x5c[\x00-\x7f])*\x22)(\x2e([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x22([^\x0d\x22\x5c\x80-\xff]|\x5c[\x00-\x7f])*\x22))*\x40([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x5b([^\x0d\x5b-\x5d\x80-\xff]|\x5c[\x00-\x7f])*\x5d)(\x2e([^\x00-\x20\x22\x28\x29\x2c\x2e\x3a-\x3c\x3e\x40\x5b-\x5d\x7f-\xff]+|\x5b([^\x0d\x5b-\x5d\x80-\xff]|\x5c[\x00-\x7f])*\x5d))*(\.\w{2,})+$/.test(t)},this.creditcard=function(t,e,r){if(!t)return!0;if(/[^0-9 \-]+/.test(t))return!1;var n,i,a=0,o=0,s=!1;if((t=t.replace(/\D/g,"")).length<13||t.length>19)return!1;for(n=t.length-1;n>=0;n--)i=t.charAt(n),o=parseInt(i,10),s&&(o*=2)>9&&(o-=9),a+=o,s=!s;return a%10==0},this.url=function(t,e,r){if(!t)return!0;var n=t.toLowerCase();return n.indexOf("http://")>-1||n.indexOf("https://")>-1||n.indexOf("ftp://")>-1},this.phone=function(t,e,r){return!t||!/[\+\-\s][\-\s]/g.test(t)&&/^\+?[0-9\-\s]+$/.test(t)},this.remote=function(t,e,r){if(!t)return!0;for(var n=r.additionalfields.split(","),i={},a=0,s=n;a<s.length;a++){var u=s[a],l=u.substr(2),d=o(e.name,u);Boolean(d&&d.value)&&(i[l]=d.value)}var f=r.url,c=[];for(var l in i){var v=encodeURIComponent(l)+"="+encodeURIComponent(i[l]);c.push(v)}var h=c.join("&");return new Promise((function(t,e){var n=new XMLHttpRequest;if("Post"===r.type){var a=new FormData;for(var o in i)a.append(o,i[o]);n.open("post",f),n.setRequestHeader("Content-Type","application/x-www-form-urlencoded"),n.send(h)}else n.open("get",f+"?"+h),n.send();n.onload=function(r){if(n.status>=200&&n.status<300){var i=JSON.parse(n.responseText);t(i)}else 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null!=e.summary[a]},this.logger=t||a}return t.prototype.addProvider=function(t,e){this.providers[t]||(this.logger.log("Registered provider: "+t),this.providers[t]=e)},t.prototype.addMvcProviders=function(){var t=new s;this.addProvider("required",t.required),this.addProvider("length",t.stringLength),this.addProvider("maxlength",t.stringLength),this.addProvider("minlength",t.stringLength),this.addProvider("equalto",t.compare),this.addProvider("range",t.range),this.addProvider("regex",t.regex),this.addProvider("creditcard",t.creditcard),this.addProvider("email",t.email),this.addProvider("url",t.url),this.addProvider("phone",t.phone),this.addProvider("remote",t.remote)},t.prototype.scanMessages=function(t){var e=Array.from(t.querySelectorAll("[data-valmsg-for]"));t.hasAttribute("data-valmsg-for")&&e.push(t);for(var r=0;r<e.length;r++){var n=e[r],i=n.getAttribute("data-valmsg-for");this.messageFor[i]||(this.messageFor[i]=[]),this.messageFor[i].push(n)}},t.prototype.parseDirectives=function(t){for(var e={},r={},n="data-val-".length,i=0;i<t.length;i++){var a=t[i];if(0===a.name.indexOf("data-val-")){var o=a.name.substr(n);r[o]=a.value}}var s=function(t){if(-1===t.indexOf("-")){for(var n=Object.keys(r).filter((function(e){return e!==t&&0===e.indexOf(t)})),i={error:r[t],params:{}},a=(t+"-").length,o=0;o<n.length;o++){var s=r[n[o]],u=n[o].substr(a);i.params[u]=s}e[t]=i}};for(var o in r)s(o);return e},t.prototype.guid4=function(){return"xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g,(function(t){var e=16*Math.random()|0;return("x"==t?e:3&e|8).toString(16)}))},t.prototype.getElementUID=function(t){var e=this.elementUIDs.filter((function(e){return e.node===t}))[0];if(e)return e.uid;var r=this.guid4();return this.elementUIDs.push({node:t,uid:r}),this.elementByUID[r]=t,r},t.prototype.getFormValidationTask=function(t){var e=this.formInputs[t];if(!e||0===e.length)return null;for(var r=[],n=0;n<e.length;n++){var i=e[n];r.push(this.validators[i])}var a=r.map((function(t){return t()}));return Promise.all(a).then((function(t){return t.every((function(t){return t}))}))},t.prototype.shouldValidate=function(t){return!(null!==t&&t.submitter&&t.submitter.formNoValidate)},t.prototype.trackFormInput=function(t,e){var r=this,n=this.getElementUID(t);if(this.formInputs[n]||(this.formInputs[n]=[]),-1===this.formInputs[n].indexOf(e)&&this.formInputs[n].push(e),!this.elementEvents[n]){var i=function(e,i){if(r.shouldValidate(e)){var a=r.getFormValidationTask(n);a&&a.then((function(n){var a=!e;if(n){if(a)return void i(!0);var o=new CustomEvent("validation",{detail:{valid:!0}});t.dispatchEvent(o)}else{e&&(e.preventDefault(),e.stopImmediatePropagation());var s=new CustomEvent("validation",{detail:{valid:!1}});t.dispatchEvent(s),a?i(!1):r.focusFirstInvalid(t)}})).catch((function(t){console.log(t)}))}};t.addEventListener("submit",i),t.addEventListener("reset",(function(t){for(var e=0,i=r.formInputs[n];e<i.length;e++){var a=i[e],o=r.elementByUID[a];o.classList.remove("input-validation-error"),o.classList.remove("input-validation-valid");var s=r.messageFor[o.name];if(s)for(var u=0;u<s.length;u++)s[u].innerHTML="";delete r.summary[a]}r.renderSummary()})),this.elementEvents[n]=i}},t.prototype.addInput=function(t){var e=this,r=this.getElementUID(t),n=this.parseDirectives(t.attributes),i=this.createValidator(t,n);if(this.validators[r]=i,t.form&&this.trackFormInput(t.form,r),!this.elementEvents[r]){var a,o=function(t){var n=e.validators[r];clearTimeout(a),a=setTimeout(n,e.debounce)},s="select"===t.tagName.toLowerCase(),u=t.dataset.valEvent;s?t.addEventListener("change",o):u?t.addEventListener(u,o):t.addEventListener("input",o),this.elementEvents[r]=o}},t.prototype.scanInputs=function(t){var e=Array.from(t.querySelectorAll('[data-val="true"]'));"true"===t.getAttribute("data-val")&&e.push(t);for(var r=0;r<e.length;r++){var n=e[r];this.addInput(n)}},t.prototype.createSummaryDOM=function(){if(!Object.keys(this.summary).length)return null;var t=document.createElement("ul");for(var e in this.summary){var r=document.createElement("li");r.innerHTML=this.summary[e],t.appendChild(r)}return t},t.prototype.renderSummary=function(){var t=document.querySelectorAll('[data-valmsg-summary="true"]');if(t.length){var e=JSON.stringify(this.summary,Object.keys(this.summary).sort());if(e!==this.renderedSummaryJSON){this.renderedSummaryJSON=e;for(var r=this.createSummaryDOM(),n=0;n<t.length;n++){var i=t[n];i.innerHTML="",r?(i.className="validation-summary-errors",i.appendChild(r.cloneNode(!0))):i.className="validation-summary-valid"}}}},t.prototype.addError=function(t,e){var r=this.messageFor[t.name];if(r)for(var n=0;n<r.length;n++)r[n].innerHTML=e,r[n].className="field-validation-error";t.classList.remove("input-validation-valid"),t.classList.add("input-validation-error");var i=this.getElementUID(t);this.summary[i]=e,this.renderSummary()},t.prototype.removeError=function(t){var e=this.messageFor[t.name];if(e)for(var r=0;r<e.length;r++)e[r].innerHTML="",e[r].className="field-validation-valid";t.classList.remove("input-validation-error"),t.classList.add("input-validation-valid");var n=this.getElementUID(t);delete this.summary[n],this.renderSummary()},t.prototype.createValidator=function(t,e){var r=this;return function(){return n(r,void 0,void 0,(function(){var r,n,a,o,s,u,l,d,f,c;return i(this,(function(i){switch(i.label){case 0:if(this.isHidden(t))return[3,7];for(n in r=[],e)r.push(n);a=0,i.label=1;case 1:return a<r.length?(o=r[a],s=e[o],(u=this.providers[o])?(this.logger.log("Running "+o+" validator on element",t),l=u(t.value,t,s.params),d=!1,f=s.error,"boolean"!=typeof l?[3,2]:(d=l,[3,5])):(console.log("aspnet-validation provider not implemented: "+o),[3,6])):[3,7];case 2:return"string"!=typeof l?[3,3]:(d=!1,f=l,[3,5]);case 3:return[4,l];case 4:"boolean"==typeof(c=i.sent())?d=c:(d=!1,f=c),i.label=5;case 5:if(!d)return this.addError(t,f),[2,!1];i.label=6;case 6:return a++,[3,1];case 7:return this.removeError(t),[2,!0]}}))}))}},t.prototype.isHidden=function(t){return!(this.allowHiddenFields||t.offsetWidth||t.offsetHeight||t.getClientRects().length)},t.prototype.bootstrap=function(t){var e=this;(t=t||{}).root=t.root||window.document.body,this.addMvcProviders(),"loading"!==window.document.readyState?this.scan(t.root):window.document.addEventListener("DOMContentLoaded",(function(r){e.scan(t.root)})),t.watch&&this.watch(t.root)},t.prototype.scan=function(t){this.scanMessages(t),this.scanInputs(t)},t.prototype.watch=function(t){var e=this;this.observer=new MutationObserver((function(t){t.forEach((function(t){e.observed(t)}))})),this.observer.observe(t,{attributes:!0,childList:!0,subtree:!0}),this.logger.log("Watching for mutations")},t.prototype.observed=function(t){if("childList"===t.type)for(var e=0;e<t.addedNodes.length;e++){var r=t.addedNodes[e];r instanceof HTMLElement&&this.scan(r)}else"attributes"===t.type&&t.target instanceof HTMLElement&&this.scan(t.target)},t}()}])}));
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diff --git a/dist/aspnet-validation.min.js.map b/dist/aspnet-validation.min.js.map
index 6c6104c..e00081a 100644
--- a/dist/aspnet-validation.min.js.map
+++ b/dist/aspnet-validation.min.js.map
@@ -1 +1 @@
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'a', getter);\n \t\treturn getter;\n \t};\n\n \t// Object.prototype.hasOwnProperty.call\n \t__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };\n\n \t// __webpack_public_path__\n \t__webpack_require__.p = \"\";\n\n\n \t// Load entry module and return exports\n \treturn __webpack_require__(__webpack_require__.s = 0);\n","/**\n * A simple IDictionary<string, string>\n */\nexport interface StringKeyValuePair {\n    [key: string]: string\n}\n\n/**\n * A duplex key-value pair for an element, by GUID or its DOM object reference.\n */\ninterface ElementUID {\n    node: Element,\n    uid: string;\n}\n\n/**\n * Parameters passed into validation providers from the element attributes.\n * error property is read from data-val-[Provider Name] attribute.\n * params property is populated from data-val-[Provider Name]-[Parameter Name] attributes.\n */\nexport interface ValidationDirectiveBindings {\n    error: string,\n    params: StringKeyValuePair\n}\n\n/**\n * A key-value pair describing what validations to enforce to an input element, with respective parameters.\n */\nexport type ValidationDirective = {\n    [key: string]: ValidationDirectiveBindings\n};\n\n/**\n * Validation plugin signature with multitype return.\n * Boolean return signifies the validation result, which uses the default validation error message read from the element attribute.\n * String return signifies failed validation, which then will be used as the validation error message.\n * Promise return signifies asynchronous plugin behavior, with same behavior as Boolean or String.\n */\nexport type ValidationProvider = (value: string, element: HTMLInputElement, params: StringKeyValuePair) => boolean | string | Promise<boolean | string>;\n\n/**\n * A callback method signature that kickstarts a new validation task for an input element, as a Boolean Promise.\n */\ntype Validator = () => Promise<boolean>;\n\n/**\n * Resolves and returns the element referred by original element using ASP.NET selector logic.\n * @param elementName\n */\nfunction getRelativeFormElement(elementName: string, selector: string) {\n    // example elementName: Form.PasswordConfirm, Form.Email\n    // example selector (dafuq): *.Password, *.__RequestVerificationToken\n    // example result element name: Form.Password, __RequestVerificationToken\n\n    let realSelector = selector.substr(2); // Password, __RequestVerificationToken\n    let objectName = '';\n\n    let dotLocation = elementName.lastIndexOf('.');\n    if (dotLocation > -1) {\n        // Form\n        objectName = elementName.substr(0, dotLocation);\n\n        // Form.Password\n        let relativeElementName = objectName + '.' + realSelector;\n        let relativeElement = document.getElementsByName(relativeElementName)[0];\n        if (relativeElement) {\n            return relativeElement;\n        }\n    }\n\n    // __RequestVerificationToken\n    return document.getElementsByName(realSelector)[0];\n}\n\n/**\n * Contains default implementations for ASP.NET Core MVC validation attributes.\n */\nexport class MvcValidationProviders {\n    /**\n     * Validates whether the input has a value.\n     */\n    required: ValidationProvider = (value, element, params) => {\n        return Boolean(value);\n    }\n\n    /**\n     * Validates whether the input value satisfies the length contstraint.\n     */\n    stringLength: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        if (params.min) {\n            let min = parseInt(params.min);\n            if (value.length < min) {\n                return false;\n            }\n        }\n\n        if (params.max) {\n            let max = parseInt(params.max);\n            if (value.length > max) {\n                return false;\n            }\n        }\n\n        return true;\n    }\n\n    /**\n     * Validates whether the input value is equal to another input value.\n     */\n    compare: ValidationProvider = (value, element, params) => {\n        if (!params.other) {\n            return true;\n        }\n\n        let otherElement = getRelativeFormElement(element.name, params.other) as HTMLInputElement;\n        if (!otherElement) {\n            return true;\n        }\n\n        return (otherElement.value === value);\n    }\n\n    /**\n     * Validates whether the input value is a number within a given range.\n     */\n    range: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        let val = parseFloat(value);\n        if (isNaN(val)) {\n            return false;\n        }\n\n        if (params.min) {\n            let min = parseFloat(params.min);\n            if (val < min) {\n                return false;\n            }\n        }\n\n        if (params.max) {\n            let max = parseFloat(params.max);\n            if (val > max) {\n                return false;\n            }\n        }\n\n        return true;\n    }\n\n    /**\n     * Validates whether the input value satisfies a regular expression pattern.\n     */\n    regex: ValidationProvider = (value, element, params) => {\n        if (!value || !params.pattern) {\n            return true;\n        }\n\n        let r = new RegExp(params.pattern);\n        return r.test(value);\n    }\n\n    /**\n     * Validates whether the input value is an email in accordance to RFC822 specification, with a top level domain.\n     */\n    email: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // RFC822 email address with .TLD validation\n        // (c) Richard Willis, Chris Ferdinandi, MIT Licensed\n        // https://gist.github.com/badsyntax/719800\n        // https://gist.github.com/cferdinandi/d04aad4ce064b8da3edf21e26f8944c4\n\n        let r = /^([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22)(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22))*\\x40([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d)(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d))*(\\.\\w{2,})+$/;\n        return r.test(value);\n    }\n\n    /**\n     * Validates whether the input value is a credit card number, with Luhn's Algorithm.\n     */\n    creditcard: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // (c) jquery-validation, MIT Licensed\n        // https://github.com/jquery-validation/jquery-validation/blob/master/src/additional/creditcard.js\n        // based on https://en.wikipedia.org/wiki/Luhn_algorithm\n\n        // Accept only spaces, digits and dashes\n        if (/[^0-9 \\-]+/.test(value)) {\n            return false;\n        }\n\n        var nCheck = 0,\n            nDigit = 0,\n            bEven = false,\n            n, cDigit;\n\n        value = value.replace(/\\D/g, \"\");\n\n        // Basing min and max length on https://developer.ean.com/general_info/Valid_Credit_Card_Types\n        if (value.length < 13 || value.length > 19) {\n            return false;\n        }\n\n        for (n = value.length - 1; n >= 0; n--) {\n            cDigit = value.charAt(n);\n            nDigit = parseInt(cDigit, 10);\n            if (bEven) {\n                if ((nDigit *= 2) > 9) {\n                    nDigit -= 9;\n                }\n            }\n\n            nCheck += nDigit;\n            bEven = !bEven;\n        }\n\n        return (nCheck % 10) === 0;\n    }\n\n    /**\n     * Validates whether the input value is a URL.\n     */\n    url: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        let lowerCaseValue = value.toLowerCase();\n\n        // Match the logic in `UrlAttribute`\n        return lowerCaseValue.indexOf('http://') > -1\n            || lowerCaseValue.indexOf('https://') > -1\n            || lowerCaseValue.indexOf('ftp://') > -1;\n    }\n\n    /**\n     * Validates whether the input value is a phone number.\n     */\n    phone: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // Allows whitespace or dash as number separator because some people like to do that...\n        let consecutiveSeparator = /[\\+\\-\\s][\\-\\s]/g;\n        if (consecutiveSeparator.test(value)) {\n            return false;\n        }\n\n        let r = /^\\+?[0-9\\-\\s]+$/;\n        return r.test(value);\n    }\n\n    /**\n     * Asynchronously validates the input value to a JSON GET API endpoint.\n     */\n    remote: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // params.additionalfields: *.Email,*.Username\n        let fieldSelectors: string[] = (params.additionalfields as string).split(',');\n        let fields: StringKeyValuePair = {};\n\n        for (let fieldSelector of fieldSelectors) {\n            let fieldName = fieldSelector.substr(2);\n            let fieldElement = getRelativeFormElement(element.name, fieldSelector) as HTMLInputElement;\n\n            let hasValue = Boolean(fieldElement && fieldElement.value);\n            if (!hasValue) {\n                continue;\n            }\n\n            fields[fieldName] = fieldElement.value;\n        }\n\n        let url: string = params['url'];\n        // console.log(fields);\n\n        let encodedParams: string[] = [];\n        for (let fieldName in fields) {\n            let encodedParam = encodeURIComponent(fieldName) + '=' + encodeURIComponent(fields[fieldName]);\n            encodedParams.push(encodedParam);\n        }\n        let payload = encodedParams.join('&');\n        // console.log(payload);\n\n        return new Promise((ok, reject) => {\n            let request = new XMLHttpRequest();\n\n            if (params.type === 'Post') {\n                let postData = new FormData();\n                for (let fieldName in fields) {\n                    postData.append(fieldName, fields[fieldName]);\n                }\n                request.open('post', url);\n                request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');\n                request.send(payload);\n            } else {\n                request.open('get', url + '?' + payload);\n                request.send();\n            }\n\n            request.onload = e => {\n                if (request.status >= 200 && request.status < 300) {\n                    let data = JSON.parse(request.responseText);\n                    ok(data);\n                } else {\n                    reject({\n                        status: request.status,\n                        statusText: request.statusText,\n                        data: request.responseText\n                    });\n                }\n            };\n\n            request.onerror = e => {\n                reject({\n                    status: request.status,\n                    statusText: request.statusText,\n                    data: request.responseText\n                });\n            };\n        });\n    }\n}\n\n/**\n * Responsibles for managing the DOM elements and running the validation providers.\n */\nexport class ValidationService {\n    /**\n     * A key-value collection of loaded validation plugins.\n     */\n    private providers: { [name: string]: ValidationProvider } = {};\n\n    /**\n     * A key-value collection of <span> elements for displaying validation messages for an input (by DOM ID).\n     */\n    private messageFor: { [id: string]: Element[] } = {};\n\n    /**\n     * A list of managed elements, each having a randomly assigned unique identifier (UID).\n     */\n    private elementUIDs: ElementUID[] = [];\n\n    /**\n     * A key-value collection of UID to Element for quick lookup.\n     */\n    private elementByUID: { [uid: string]: Element } = {};\n\n    /**\n     * A key-value collection of input UIDs for a <form> UID.\n     */\n    private formInputs: { [formUID: string]: string[] } = {};\n\n    /**\n     * A key-value map for input UID to its validator factory.\n     */\n    private validators: { [inputUID: string]: Validator } = {};\n\n    /**\n     * A key-value map for element UID to its trigger element (submit event for <form>, input event for <textarea> and <input>).\n     */\n    private elementEvents: { [id: string]: (e: Event, callback?: Function) => any } = {};\n\n    /**\n     * A key-value map of input UID to its validation error message.\n     */\n    private summary: StringKeyValuePair = {};\n\n    /**\n     * A serialized representation of the validation error message summary rendered to the user.\n     */\n    private renderedSummaryJSON: string;\n\n    /**\n     * In milliseconds, the rate of fire of the input validation.\n     */\n    debounce = 300;\n\n    /**\n     * Allow hidden fields validation     \n     */\n    allowHiddenFields = false;\n\n    /**\n     * Registers a new validation plugin of the given name, if not registered yet.\n     * Registered plugin validates inputs with data-val-[name] attribute, used as error message.\n     * @param name\n     * @param callback\n     */\n    addProvider(name: string, callback: ValidationProvider) {\n        if (this.providers[name]) {\n            // First-Come-First-Serve validation plugin design.\n            // Allows developers to override the default MVC Providers by adding custom providers BEFORE bootstrap() is called!\n            return;\n        }\n        this.providers[name] = callback;\n    }\n\n    /**\n     * Registers the default providers for enabling ASP.NET Core MVC client-side validation.\n     */\n    private addMvcProviders() {\n        let mvc = new MvcValidationProviders();\n\n        // [Required]\n        this.addProvider('required', mvc.required);\n        // [StringLength], [MinLength], [MaxLength]\n        this.addProvider('length', mvc.stringLength);\n        this.addProvider('maxlength', mvc.stringLength);\n        this.addProvider('minlength', mvc.stringLength);\n        // [Compare]\n        this.addProvider('equalto', mvc.compare);\n        // [Range]\n        this.addProvider('range', mvc.range);\n        // [RegularExpression]\n        this.addProvider('regex', mvc.regex);\n        // [CreditCard]\n        this.addProvider('creditcard', mvc.creditcard);\n        // [EmailAddress]\n        this.addProvider('email', mvc.email);\n        // [Url]\n        this.addProvider('url', mvc.url);\n        // [Phone]\n        this.addProvider('phone', mvc.phone);\n        // [Remote]\n        this.addProvider('remote', mvc.remote);\n    }\n\n    /**\n     * Scans document for all validation message <span> generated by ASP.NET Core MVC, then tracks them.\n     */\n    private scanMessages() {\n        let validationMessageElements = document.querySelectorAll('[data-valmsg-for]');\n\n        for (let i = 0; i < validationMessageElements.length; i++) {\n            let e = validationMessageElements[i];\n            let name = e.getAttribute('data-valmsg-for');\n\n            if (!this.messageFor[name]) {\n                this.messageFor[name] = [];\n            }\n\n            this.messageFor[name].push(e);\n        }\n    }\n\n    /**\n     * Given attribute map for an HTML input, returns the validation directives to be executed.\n     * @param attributes\n     */\n    parseDirectives(attributes: NamedNodeMap) {\n        let directives: ValidationDirective = {};\n        let validationAtributes: StringKeyValuePair = {};\n\n        let cut = 'data-val-'.length;\n        for (let i = 0; i < attributes.length; i++) {\n            let a = attributes[i];\n            if (a.name.indexOf('data-val-') === 0) {\n                let key = a.name.substr(cut);\n                validationAtributes[key] = a.value;\n            }\n        }\n\n        for (let key in validationAtributes) {\n            if (key.indexOf('-') === -1) {\n                let parameters = Object.keys(validationAtributes).filter(Q => {\n                    return (Q !== key) && (Q.indexOf(key) === 0);\n                });\n\n                let directive: ValidationDirectiveBindings = {\n                    error: validationAtributes[key],\n                    params: {}\n                };\n\n                let pcut = (key + '-').length;\n                for (let i = 0; i < parameters.length; i++) {\n                    let pvalue = validationAtributes[parameters[i]];\n                    let pkey = parameters[i].substr(pcut);\n\n                    directive.params[pkey] = pvalue;\n                }\n\n                directives[key] = directive;\n            }\n        }\n\n        // console.log(directives);\n        return directives;\n    }\n\n    /**\n     *  Returns an RFC4122 version 4 compliant GUID.\n     */\n    private guid4() {\n        // (c) broofa, MIT Licensed\n        // https://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript/2117523#2117523\n\n        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {\n            var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);\n            return v.toString(16);\n        });\n    }\n\n    /**\n     * Gets a UID for an DOM element.\n     * @param node\n     */\n    private getElementUID(node: Element) {\n        let x = this.elementUIDs.filter(e => {\n            return e.node === node;\n        })[0];\n\n        if (x) {\n            return x.uid;\n        }\n\n        let uid = this.guid4();\n        this.elementUIDs.push({\n            node: node,\n            uid: uid\n        });\n        this.elementByUID[uid] = node;\n        return uid;\n    }\n\n    /**\n     * Returns a Promise that returns validation result for each and every inputs within the form.\n     * @param formUID\n     */\n    private getFormValidationTask(formUID: string) {\n        let formInputUIDs = this.formInputs[formUID];\n        if (!formInputUIDs || formInputUIDs.length === 0) {\n            return null;\n        }\n\n        let formValidators: Validator[] = [];\n\n        for (let i = 0; i < formInputUIDs.length; i++) {\n            let inputUID = formInputUIDs[i];\n            formValidators.push(this.validators[inputUID]);\n        }\n\n        let tasks = formValidators.map(factory => factory());\n        return Promise.all(tasks).then(result => result.every(e => e));\n    }\n\n    /**\n     * Fires off validation for elements within the provided form and then calls the callback\n     * @param form\n     * @param callback\n     */\n    validateForm = (form: HTMLFormElement, callback: Function) => {\n        let formUID = this.getElementUID(form);\n        let formValidationEvent = this.elementEvents[formUID];\n        if (formValidationEvent) {\n            formValidationEvent(null, callback);\n        }\n    }\n\n\n    /**\n     * Focuses the first invalid element within the provided form\n     * @param form\n     */\n    focusFirstInvalid = (form: HTMLFormElement) => {\n        let formUID = this.getElementUID(form);\n        let formInputUIDs = this.formInputs[formUID];\n        let invalidFormInputUIDs = formInputUIDs.filter(uid => this.summary[uid]);\n\n        if (invalidFormInputUIDs.length > 0) {\n            var firstInvalid = this.elementByUID[invalidFormInputUIDs[0]] as HTMLElement;\n            if (firstInvalid) {\n                firstInvalid.focus();\n            }\n        }\n    }\n\n    /**\n     * Returns true if the provided form is valid, and then calls the callback. The form will be validated before checking, unless prevalidate is set to false\n     * @param form\n     * @param prevalidate\n     * @param callback\n     * @returns\n     */\n    isValid = (form: HTMLFormElement, prevalidate: boolean = true, callback: Function) => {\n        if (prevalidate) {\n            this.validateForm(form, callback);\n        }\n        let formUID = this.getElementUID(form);\n        let formInputUIDs = this.formInputs[formUID];\n        let invalidFormInputUIDs = formInputUIDs.filter(uid => this.summary[uid]);\n        return invalidFormInputUIDs.length == 0;\n    }\n\n    /**\n     * Returns true if the provided field is valid, and then calls the callback. The form will be validated before checking, unless prevalidate is set to false\n     * @param form\n     * @param prevalidate\n     * @param callback\n     * @returns\n     */\n    isFieldValid = (field: HTMLElement, prevalidate: boolean = true, callback: Function) => {\n\n        if (prevalidate) {\n            let form = field.closest(\"form\");\n            if (form != null) {\n                this.validateForm(form, callback);\n            }\n        }\n\n        let fieldUID = this.getElementUID(field);\n        return this.summary[fieldUID] != null;\n    }\n\n    /**\n     * Returns true if the event triggering the form submission indicates we should validate the form.\n     * @param e\n     */\n    private shouldValidate(e: Event) {\n        // Skip client-side validation if the form has been submitted via a button that has the \"formnovalidate\" attribute.\n        return !(e !== null && e['submitter'] && e['submitter']['formNoValidate']);\n    }\n\n    /**\n     * Tracks a <form> element as parent of an input UID. When the form is submitted, attempts to validate the said input asynchronously.\n     * @param form\n     * @param inputUID\n     */\n    private trackFormInput(form: HTMLFormElement, inputUID: string) {\n        let formUID = this.getElementUID(form);\n        if (!this.formInputs[formUID]) {\n            this.formInputs[formUID] = [];\n        }\n        let add = (this.formInputs[formUID].indexOf(inputUID) === -1);\n        if (add) {\n            this.formInputs[formUID].push(inputUID);\n        }\n\n        if (this.elementEvents[formUID]) {\n            return;\n        }\n\n        let cb = (e: Event, callback?: Function) => {\n            if (!this.shouldValidate(e)) {\n                return;\n            }\n\n            let validate = this.getFormValidationTask(formUID);\n            if (!validate) {\n                return;\n            }\n\n            validate.then(success => {\n                let isProgrammaticValidate = !e;\n                if (success) {\n                    if (isProgrammaticValidate) {\n                        callback(true);\n                        return;\n                    }\n                    const validationEvent = new CustomEvent('validation',\n                    {\n                        detail: { valid: true }\n                    });\n                    form.dispatchEvent(validationEvent);\n                    return;\n                }\n\n                if (e) {\n                    e.preventDefault();\n                    e.stopImmediatePropagation();\n                }\n\n                const validationEvent = new CustomEvent('validation',\n                {\n                    detail: { valid: false }\n                });\n                form.dispatchEvent(validationEvent);\n\n\n                if (isProgrammaticValidate) {\n                    callback(false);\n                }\n                else {\n                    this.focusFirstInvalid(form);\n                }\n            }).catch(error => {\n                console.log(error);\n            });\n        };\n\n        form.addEventListener('submit', cb);\n        form.addEventListener('reset', e => {\n            let uids = this.formInputs[formUID];\n\n            for (let uid of uids) {\n                let input = this.elementByUID[uid] as HTMLInputElement;\n                input.classList.remove('input-validation-error');\n                input.classList.remove('input-validation-valid');\n\n                let spans = this.messageFor[input.name];\n                if (spans) {\n                    for (let i = 0; i < spans.length; i++) {\n                        spans[i].innerHTML = '';\n                    }\n                }\n\n                delete this.summary[uid];\n            }\n            this.renderSummary();\n        });\n        this.elementEvents[formUID] = cb;\n    }\n\n    /**\n     * Adds an input element to be managed and validated by the service.\n     * Triggers a debounced live validation when input value changes.\n     * @param input\n     */\n    addInput(input: HTMLInputElement) {\n        let uid = this.getElementUID(input);\n\n        let directives = this.parseDirectives(input.attributes);\n        let validate = this.createValidator(input, directives);\n\n        this.validators[uid] = validate;\n        if (input.form) {\n            this.trackFormInput(input.form, uid);\n        }\n\n        if (this.elementEvents[uid]) {\n            return;\n        }\n\n        let delay;\n        let cb = e => {\n            let validate = this.validators[uid];\n            clearTimeout(delay);\n            delay = setTimeout(validate, this.debounce);\n        };\n\n        let isDropdown = input.tagName.toLowerCase() === 'select';\n        let validateEvent = input.dataset.valEvent;\n        if (isDropdown) {\n            input.addEventListener('change', cb);\n        } else if (validateEvent) {\n            input.addEventListener(validateEvent, cb);\n        }\n        else {\n            input.addEventListener('input', cb);\n        }\n\n        this.elementEvents[uid] = cb;\n    }\n\n    /**\n     * Scans the entire document for input elements to be validated.\n     */\n    private scanInputs() {\n        let inputs = document.querySelectorAll('[data-val=\"true\"]');\n\n        for (let i = 0; i < inputs.length; i++) {\n            let input = inputs[i] as HTMLInputElement;\n            this.addInput(input);\n        }\n    }\n\n    /**\n     * Returns a <ul> element as a validation errors summary.\n     */\n    createSummaryDOM() {\n        if (!Object.keys(this.summary).length) {\n            return null;\n        }\n\n        let ul = document.createElement('ul');\n        for (let key in this.summary) {\n            let li = document.createElement('li');\n            li.innerHTML = this.summary[key];\n            ul.appendChild(li);\n        }\n        return ul;\n    }\n\n    /**\n     * Displays validation summary to ASP.NET Core MVC designated elements, when it actually gets updated.\n     */\n    private renderSummary() {\n        let summaryElements = document.querySelectorAll('[data-valmsg-summary=\"true\"]');\n        if (!summaryElements.length) {\n            return;\n        }\n\n        // Using JSON.stringify for quick and painless deep compare of simple KVP. 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\ No newline at end of file
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'a', getter);\n \t\treturn getter;\n \t};\n\n \t// Object.prototype.hasOwnProperty.call\n \t__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };\n\n \t// __webpack_public_path__\n \t__webpack_require__.p = \"\";\n\n\n \t// Load entry module and return exports\n \treturn __webpack_require__(__webpack_require__.s = 0);\n","/**\n * A simple IDictionary<string, string>\n */\nexport interface StringKeyValuePair {\n    [key: string]: string\n}\n\n/**\n * A duplex key-value pair for an element, by GUID or its DOM object reference.\n */\ninterface ElementUID {\n    node: Element,\n    uid: string;\n}\n\n/**\n * A simple logging interface that mirrors the Console object.\n */\nexport interface Logger {\n    log(message: string, ...args: any[]): void;\n}\n\nconst nullLogger = new (class implements Logger {\n    log(_: string, ...args: any[]): void {}\n})();\n\n/**\n * Parameters passed into validation providers from the element attributes.\n * error property is read from data-val-[Provider Name] attribute.\n * params property is populated from data-val-[Provider Name]-[Parameter Name] attributes.\n */\nexport interface ValidationDirectiveBindings {\n    error: string,\n    params: StringKeyValuePair\n}\n\n/**\n * A key-value pair describing what validations to enforce to an input element, with respective parameters.\n */\nexport type ValidationDirective = {\n    [key: string]: ValidationDirectiveBindings\n};\n\n/**\n * Validation plugin signature with multitype return.\n * Boolean return signifies the validation result, which uses the default validation error message read from the element attribute.\n * String return signifies failed validation, which then will be used as the validation error message.\n * Promise return signifies asynchronous plugin behavior, with same behavior as Boolean or String.\n */\nexport type ValidationProvider = (value: string, element: HTMLInputElement, params: StringKeyValuePair) => boolean | string | Promise<boolean | string>;\n\n/**\n * A callback method signature that kickstarts a new validation task for an input element, as a Boolean Promise.\n */\ntype Validator = () => Promise<boolean>;\n\n/**\n * Resolves and returns the element referred by original element using ASP.NET selector logic.\n * @param elementName\n */\nfunction getRelativeFormElement(elementName: string, selector: string) {\n    // example elementName: Form.PasswordConfirm, Form.Email\n    // example selector (dafuq): *.Password, *.__RequestVerificationToken\n    // example result element name: Form.Password, __RequestVerificationToken\n\n    let realSelector = selector.substr(2); // Password, __RequestVerificationToken\n    let objectName = '';\n\n    let dotLocation = elementName.lastIndexOf('.');\n    if (dotLocation > -1) {\n        // Form\n        objectName = elementName.substr(0, dotLocation);\n\n        // Form.Password\n        let relativeElementName = objectName + '.' + realSelector;\n        let relativeElement = document.getElementsByName(relativeElementName)[0];\n        if (relativeElement) {\n            return relativeElement;\n        }\n    }\n\n    // __RequestVerificationToken\n    return document.getElementsByName(realSelector)[0];\n}\n\n/**\n * Contains default implementations for ASP.NET Core MVC validation attributes.\n */\nexport class MvcValidationProviders {\n    /**\n     * Validates whether the input has a value.\n     */\n    required: ValidationProvider = (value, element, params) => {\n        return Boolean(value);\n    }\n\n    /**\n     * Validates whether the input value satisfies the length contstraint.\n     */\n    stringLength: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        if (params.min) {\n            let min = parseInt(params.min);\n            if (value.length < min) {\n                return false;\n            }\n        }\n\n        if (params.max) {\n            let max = parseInt(params.max);\n            if (value.length > max) {\n                return false;\n            }\n        }\n\n        return true;\n    }\n\n    /**\n     * Validates whether the input value is equal to another input value.\n     */\n    compare: ValidationProvider = (value, element, params) => {\n        if (!params.other) {\n            return true;\n        }\n\n        let otherElement = getRelativeFormElement(element.name, params.other) as HTMLInputElement;\n        if (!otherElement) {\n            return true;\n        }\n\n        return (otherElement.value === value);\n    }\n\n    /**\n     * Validates whether the input value is a number within a given range.\n     */\n    range: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        let val = parseFloat(value);\n        if (isNaN(val)) {\n            return false;\n        }\n\n        if (params.min) {\n            let min = parseFloat(params.min);\n            if (val < min) {\n                return false;\n            }\n        }\n\n        if (params.max) {\n            let max = parseFloat(params.max);\n            if (val > max) {\n                return false;\n            }\n        }\n\n        return true;\n    }\n\n    /**\n     * Validates whether the input value satisfies a regular expression pattern.\n     */\n    regex: ValidationProvider = (value, element, params) => {\n        if (!value || !params.pattern) {\n            return true;\n        }\n\n        let r = new RegExp(params.pattern);\n        return r.test(value);\n    }\n\n    /**\n     * Validates whether the input value is an email in accordance to RFC822 specification, with a top level domain.\n     */\n    email: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // RFC822 email address with .TLD validation\n        // (c) Richard Willis, Chris Ferdinandi, MIT Licensed\n        // https://gist.github.com/badsyntax/719800\n        // https://gist.github.com/cferdinandi/d04aad4ce064b8da3edf21e26f8944c4\n\n        let r = /^([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22)(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x22([^\\x0d\\x22\\x5c\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x22))*\\x40([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d)(\\x2e([^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+|\\x5b([^\\x0d\\x5b-\\x5d\\x80-\\xff]|\\x5c[\\x00-\\x7f])*\\x5d))*(\\.\\w{2,})+$/;\n        return r.test(value);\n    }\n\n    /**\n     * Validates whether the input value is a credit card number, with Luhn's Algorithm.\n     */\n    creditcard: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // (c) jquery-validation, MIT Licensed\n        // https://github.com/jquery-validation/jquery-validation/blob/master/src/additional/creditcard.js\n        // based on https://en.wikipedia.org/wiki/Luhn_algorithm\n\n        // Accept only spaces, digits and dashes\n        if (/[^0-9 \\-]+/.test(value)) {\n            return false;\n        }\n\n        var nCheck = 0,\n            nDigit = 0,\n            bEven = false,\n            n, cDigit;\n\n        value = value.replace(/\\D/g, \"\");\n\n        // Basing min and max length on https://developer.ean.com/general_info/Valid_Credit_Card_Types\n        if (value.length < 13 || value.length > 19) {\n            return false;\n        }\n\n        for (n = value.length - 1; n >= 0; n--) {\n            cDigit = value.charAt(n);\n            nDigit = parseInt(cDigit, 10);\n            if (bEven) {\n                if ((nDigit *= 2) > 9) {\n                    nDigit -= 9;\n                }\n            }\n\n            nCheck += nDigit;\n            bEven = !bEven;\n        }\n\n        return (nCheck % 10) === 0;\n    }\n\n    /**\n     * Validates whether the input value is a URL.\n     */\n    url: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        let lowerCaseValue = value.toLowerCase();\n\n        // Match the logic in `UrlAttribute`\n        return lowerCaseValue.indexOf('http://') > -1\n            || lowerCaseValue.indexOf('https://') > -1\n            || lowerCaseValue.indexOf('ftp://') > -1;\n    }\n\n    /**\n     * Validates whether the input value is a phone number.\n     */\n    phone: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // Allows whitespace or dash as number separator because some people like to do that...\n        let consecutiveSeparator = /[\\+\\-\\s][\\-\\s]/g;\n        if (consecutiveSeparator.test(value)) {\n            return false;\n        }\n\n        let r = /^\\+?[0-9\\-\\s]+$/;\n        return r.test(value);\n    }\n\n    /**\n     * Asynchronously validates the input value to a JSON GET API endpoint.\n     */\n    remote: ValidationProvider = (value, element, params) => {\n        if (!value) {\n            return true;\n        }\n\n        // params.additionalfields: *.Email,*.Username\n        let fieldSelectors: string[] = (params.additionalfields as string).split(',');\n        let fields: StringKeyValuePair = {};\n\n        for (let fieldSelector of fieldSelectors) {\n            let fieldName = fieldSelector.substr(2);\n            let fieldElement = getRelativeFormElement(element.name, fieldSelector) as HTMLInputElement;\n\n            let hasValue = Boolean(fieldElement && fieldElement.value);\n            if (!hasValue) {\n                continue;\n            }\n\n            fields[fieldName] = fieldElement.value;\n        }\n\n        let url: string = params['url'];\n        // console.log(fields);\n\n        let encodedParams: string[] = [];\n        for (let fieldName in fields) {\n            let encodedParam = encodeURIComponent(fieldName) + '=' + encodeURIComponent(fields[fieldName]);\n            encodedParams.push(encodedParam);\n        }\n        let payload = encodedParams.join('&');\n        // console.log(payload);\n\n        return new Promise((ok, reject) => {\n            let request = new XMLHttpRequest();\n\n            if (params.type === 'Post') {\n                let postData = new FormData();\n                for (let fieldName in fields) {\n                    postData.append(fieldName, fields[fieldName]);\n                }\n                request.open('post', url);\n                request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');\n                request.send(payload);\n            } else {\n                request.open('get', url + '?' + payload);\n                request.send();\n            }\n\n            request.onload = e => {\n                if (request.status >= 200 && request.status < 300) {\n                    let data = JSON.parse(request.responseText);\n                    ok(data);\n                } else {\n                    reject({\n                        status: request.status,\n                        statusText: request.statusText,\n                        data: request.responseText\n                    });\n                }\n            };\n\n            request.onerror = e => {\n                reject({\n                    status: request.status,\n                    statusText: request.statusText,\n                    data: request.responseText\n                });\n            };\n        });\n    }\n}\n\n/**\n * Responsibles for managing the DOM elements and running the validation providers.\n */\nexport class ValidationService {\n    /**\n     * A key-value collection of loaded validation plugins.\n     */\n    private providers: { [name: string]: ValidationProvider } = {};\n\n    /**\n     * A key-value collection of <span> elements for displaying validation messages for an input (by DOM ID).\n     */\n    private messageFor: { [id: string]: Element[] } = {};\n\n    /**\n     * A list of managed elements, each having a randomly assigned unique identifier (UID).\n     */\n    private elementUIDs: ElementUID[] = [];\n\n    /**\n     * A key-value collection of UID to Element for quick lookup.\n     */\n    private elementByUID: { [uid: string]: Element } = {};\n\n    /**\n     * A key-value collection of input UIDs for a <form> UID.\n     */\n    private formInputs: { [formUID: string]: string[] } = {};\n\n    /**\n     * A key-value map for input UID to its validator factory.\n     */\n    private validators: { [inputUID: string]: Validator } = {};\n\n    /**\n     * A key-value map for element UID to its trigger element (submit event for <form>, input event for <textarea> and <input>).\n     */\n    private elementEvents: { [id: string]: (e: Event, callback?: Function) => any } = {};\n\n    /**\n     * A key-value map of input UID to its validation error message.\n     */\n    private summary: StringKeyValuePair = {};\n\n    /**\n     * A serialized representation of the validation error message summary rendered to the user.\n     */\n    private renderedSummaryJSON: string;\n\n    /**\n     * In milliseconds, the rate of fire of the input validation.\n     */\n    debounce = 300;\n\n    /**\n     * Allow hidden fields validation     \n     */\n    allowHiddenFields = false;\n\n    private logger: Logger;\n    observer?: MutationObserver;\n\n    constructor(logger?: Logger) {\n        this.logger = logger || nullLogger;\n    }\n\n    /**\n     * Registers a new validation plugin of the given name, if not registered yet.\n     * Registered plugin validates inputs with data-val-[name] attribute, used as error message.\n     * @param name\n     * @param callback\n     */\n    addProvider(name: string, callback: ValidationProvider) {\n        if (this.providers[name]) {\n            // First-Come-First-Serve validation plugin design.\n            // Allows developers to override the default MVC Providers by adding custom providers BEFORE bootstrap() is called!\n            return;\n        }\n        this.logger.log(`Registered provider: ${name}`);\n        this.providers[name] = callback;\n    }\n\n    /**\n     * Registers the default providers for enabling ASP.NET Core MVC client-side validation.\n     */\n    private addMvcProviders() {\n        let mvc = new MvcValidationProviders();\n\n        // [Required]\n        this.addProvider('required', mvc.required);\n        // [StringLength], [MinLength], [MaxLength]\n        this.addProvider('length', mvc.stringLength);\n        this.addProvider('maxlength', mvc.stringLength);\n        this.addProvider('minlength', mvc.stringLength);\n        // [Compare]\n        this.addProvider('equalto', mvc.compare);\n        // [Range]\n        this.addProvider('range', mvc.range);\n        // [RegularExpression]\n        this.addProvider('regex', mvc.regex);\n        // [CreditCard]\n        this.addProvider('creditcard', mvc.creditcard);\n        // [EmailAddress]\n        this.addProvider('email', mvc.email);\n        // [Url]\n        this.addProvider('url', mvc.url);\n        // [Phone]\n        this.addProvider('phone', mvc.phone);\n        // [Remote]\n        this.addProvider('remote', mvc.remote);\n    }\n\n    /**\n     * Scans document for all validation message <span> generated by ASP.NET Core MVC, then tracks them.\n     */\n    private scanMessages(root: HTMLElement) {\n        let validationMessageElements = Array.from(root.querySelectorAll<HTMLElement>('[data-valmsg-for]'));\n\n        // querySelectorAll does not include the root element itself.\n        // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.\n        if (root.hasAttribute(\"data-valmsg-for\")) {\n            validationMessageElements.push(root);\n        }\n\n        for (let i = 0; i < validationMessageElements.length; i++) {\n            let e = validationMessageElements[i];\n            let name = e.getAttribute('data-valmsg-for');\n\n            if (!this.messageFor[name]) {\n                this.messageFor[name] = [];\n            }\n\n            this.messageFor[name].push(e);\n        }\n    }\n\n    /**\n     * Given attribute map for an HTML input, returns the validation directives to be executed.\n     * @param attributes\n     */\n    parseDirectives(attributes: NamedNodeMap) {\n        let directives: ValidationDirective = {};\n        let validationAtributes: StringKeyValuePair = {};\n\n        let cut = 'data-val-'.length;\n        for (let i = 0; i < attributes.length; i++) {\n            let a = attributes[i];\n            if (a.name.indexOf('data-val-') === 0) {\n                let key = a.name.substr(cut);\n                validationAtributes[key] = a.value;\n            }\n        }\n\n        for (let key in validationAtributes) {\n            if (key.indexOf('-') === -1) {\n                let parameters = Object.keys(validationAtributes).filter(Q => {\n                    return (Q !== key) && (Q.indexOf(key) === 0);\n                });\n\n                let directive: ValidationDirectiveBindings = {\n                    error: validationAtributes[key],\n                    params: {}\n                };\n\n                let pcut = (key + '-').length;\n                for (let i = 0; i < parameters.length; i++) {\n                    let pvalue = validationAtributes[parameters[i]];\n                    let pkey = parameters[i].substr(pcut);\n\n                    directive.params[pkey] = pvalue;\n                }\n\n                directives[key] = directive;\n            }\n        }\n\n        // console.log(directives);\n        return directives;\n    }\n\n    /**\n     *  Returns an RFC4122 version 4 compliant GUID.\n     */\n    private guid4() {\n        // (c) broofa, MIT Licensed\n        // https://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript/2117523#2117523\n\n        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {\n            var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);\n            return v.toString(16);\n        });\n    }\n\n    /**\n     * Gets a UID for an DOM element.\n     * @param node\n     */\n    private getElementUID(node: Element) {\n        let x = this.elementUIDs.filter(e => {\n            return e.node === node;\n        })[0];\n\n        if (x) {\n            return x.uid;\n        }\n\n        let uid = this.guid4();\n        this.elementUIDs.push({\n            node: node,\n            uid: uid\n        });\n        this.elementByUID[uid] = node;\n        return uid;\n    }\n\n    /**\n     * Returns a Promise that returns validation result for each and every inputs within the form.\n     * @param formUID\n     */\n    private getFormValidationTask(formUID: string) {\n        let formInputUIDs = this.formInputs[formUID];\n        if (!formInputUIDs || formInputUIDs.length === 0) {\n            return null;\n        }\n\n        let formValidators: Validator[] = [];\n\n        for (let i = 0; i < formInputUIDs.length; i++) {\n            let inputUID = formInputUIDs[i];\n            formValidators.push(this.validators[inputUID]);\n        }\n\n        let tasks = formValidators.map(factory => factory());\n        return Promise.all(tasks).then(result => result.every(e => e));\n    }\n\n    /**\n     * Fires off validation for elements within the provided form and then calls the callback\n     * @param form\n     * @param callback\n     */\n    validateForm = (form: HTMLFormElement, callback: Function) => {\n        let formUID = this.getElementUID(form);\n        let formValidationEvent = this.elementEvents[formUID];\n        if (formValidationEvent) {\n            formValidationEvent(null, callback);\n        }\n    }\n\n\n    /**\n     * Focuses the first invalid element within the provided form\n     * @param form\n     */\n    focusFirstInvalid = (form: HTMLFormElement) => {\n        let formUID = this.getElementUID(form);\n        let formInputUIDs = this.formInputs[formUID];\n        let invalidFormInputUIDs = formInputUIDs.filter(uid => this.summary[uid]);\n\n        if (invalidFormInputUIDs.length > 0) {\n            var firstInvalid = this.elementByUID[invalidFormInputUIDs[0]] as HTMLElement;\n            if (firstInvalid) {\n                firstInvalid.focus();\n            }\n        }\n    }\n\n    /**\n     * Returns true if the provided form is valid, and then calls the callback. The form will be validated before checking, unless prevalidate is set to false\n     * @param form\n     * @param prevalidate\n     * @param callback\n     * @returns\n     */\n    isValid = (form: HTMLFormElement, prevalidate: boolean = true, callback: Function) => {\n        if (prevalidate) {\n            this.validateForm(form, callback);\n        }\n        let formUID = this.getElementUID(form);\n        let formInputUIDs = this.formInputs[formUID];\n        let invalidFormInputUIDs = formInputUIDs.filter(uid => this.summary[uid]);\n        return invalidFormInputUIDs.length == 0;\n    }\n\n    /**\n     * Returns true if the provided field is valid, and then calls the callback. The form will be validated before checking, unless prevalidate is set to false\n     * @param form\n     * @param prevalidate\n     * @param callback\n     * @returns\n     */\n    isFieldValid = (field: HTMLElement, prevalidate: boolean = true, callback: Function) => {\n\n        if (prevalidate) {\n            let form = field.closest(\"form\");\n            if (form != null) {\n                this.validateForm(form, callback);\n            }\n        }\n\n        let fieldUID = this.getElementUID(field);\n        return this.summary[fieldUID] != null;\n    }\n\n    /**\n     * Returns true if the event triggering the form submission indicates we should validate the form.\n     * @param e\n     */\n    private shouldValidate(e: Event) {\n        // Skip client-side validation if the form has been submitted via a button that has the \"formnovalidate\" attribute.\n        return !(e !== null && e['submitter'] && e['submitter']['formNoValidate']);\n    }\n\n    /**\n     * Tracks a <form> element as parent of an input UID. When the form is submitted, attempts to validate the said input asynchronously.\n     * @param form\n     * @param inputUID\n     */\n    private trackFormInput(form: HTMLFormElement, inputUID: string) {\n        let formUID = this.getElementUID(form);\n        if (!this.formInputs[formUID]) {\n            this.formInputs[formUID] = [];\n        }\n        let add = (this.formInputs[formUID].indexOf(inputUID) === -1);\n        if (add) {\n            this.formInputs[formUID].push(inputUID);\n        }\n\n        if (this.elementEvents[formUID]) {\n            return;\n        }\n\n        let cb = (e: Event, callback?: Function) => {\n            if (!this.shouldValidate(e)) {\n                return;\n            }\n\n            let validate = this.getFormValidationTask(formUID);\n            if (!validate) {\n                return;\n            }\n\n            validate.then(success => {\n                let isProgrammaticValidate = !e;\n                if (success) {\n                    if (isProgrammaticValidate) {\n                        callback(true);\n                        return;\n                    }\n                    const validationEvent = new CustomEvent('validation',\n                    {\n                        detail: { valid: true }\n                    });\n                    form.dispatchEvent(validationEvent);\n                    return;\n                }\n\n                if (e) {\n                    e.preventDefault();\n                    e.stopImmediatePropagation();\n                }\n\n                const validationEvent = new CustomEvent('validation',\n                {\n                    detail: { valid: false }\n                });\n                form.dispatchEvent(validationEvent);\n\n\n                if (isProgrammaticValidate) {\n                    callback(false);\n                }\n                else {\n                    this.focusFirstInvalid(form);\n                }\n            }).catch(error => {\n                console.log(error);\n            });\n        };\n\n        form.addEventListener('submit', cb);\n        form.addEventListener('reset', e => {\n            let uids = this.formInputs[formUID];\n\n            for (let uid of uids) {\n                let input = this.elementByUID[uid] as HTMLInputElement;\n                input.classList.remove('input-validation-error');\n                input.classList.remove('input-validation-valid');\n\n                let spans = this.messageFor[input.name];\n                if (spans) {\n                    for (let i = 0; i < spans.length; i++) {\n                        spans[i].innerHTML = '';\n                    }\n                }\n\n                delete this.summary[uid];\n            }\n            this.renderSummary();\n        });\n        this.elementEvents[formUID] = cb;\n    }\n\n    /**\n     * Adds an input element to be managed and validated by the service.\n     * Triggers a debounced live validation when input value changes.\n     * @param input\n     */\n    addInput(input: HTMLInputElement) {\n        let uid = this.getElementUID(input);\n\n        let directives = this.parseDirectives(input.attributes);\n        let validate = this.createValidator(input, directives);\n\n        this.validators[uid] = validate;\n        if (input.form) {\n            this.trackFormInput(input.form, uid);\n        }\n\n        if (this.elementEvents[uid]) {\n            return;\n        }\n\n        let delay;\n        let cb = e => {\n            let validate = this.validators[uid];\n            clearTimeout(delay);\n            delay = setTimeout(validate, this.debounce);\n        };\n\n        let isDropdown = input.tagName.toLowerCase() === 'select';\n        let validateEvent = input.dataset.valEvent;\n        if (isDropdown) {\n            input.addEventListener('change', cb);\n        } else if (validateEvent) {\n            input.addEventListener(validateEvent, cb);\n        }\n        else {\n            input.addEventListener('input', cb);\n        }\n\n        this.elementEvents[uid] = cb;\n    }\n\n    /**\n     * Scans the entire document for input elements to be validated.\n     */\n    private scanInputs(root: HTMLElement) {\n        let inputs = Array.from(root.querySelectorAll<HTMLElement>('[data-val=\"true\"]'));\n\n        // querySelectorAll does not include the root element itself.\n        // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.\n        if (root.getAttribute(\"data-val\") === \"true\") {\n            inputs.push(root);\n        }\n\n        for (let i = 0; i < inputs.length; i++) {\n            let input = inputs[i] as HTMLInputElement;\n            this.addInput(input);\n        }\n    }\n\n    /**\n     * Returns a <ul> element as a validation errors summary.\n     */\n    createSummaryDOM() {\n        if (!Object.keys(this.summary).length) {\n            return null;\n        }\n\n        let ul = document.createElement('ul');\n        for (let key in this.summary) {\n            let li = document.createElement('li');\n            li.innerHTML = this.summary[key];\n            ul.appendChild(li);\n        }\n        return ul;\n    }\n\n    /**\n     * Displays validation summary to ASP.NET Core MVC designated elements, when it actually gets updated.\n     */\n    private renderSummary() {\n        let summaryElements = document.querySelectorAll('[data-valmsg-summary=\"true\"]');\n        if (!summaryElements.length) {\n            return;\n        }\n\n        // Using JSON.stringify for quick and painless deep compare of simple KVP. You need to sort the keys first, tho...\n        let shadow = JSON.stringify(this.summary, Object.keys(this.summary).sort());\n        if (shadow === this.renderedSummaryJSON) {\n            return;\n        }\n\n        // Prevents wasteful re-rendering of summary list element with identical items!\n        // console.log('RENDERING VALIDATION SUMMARY');\n        this.renderedSummaryJSON = shadow;\n        let ul = this.createSummaryDOM();\n\n        for (let i = 0; i < summaryElements.length; i++) {\n            let e = summaryElements[i];\n            e.innerHTML = '';\n            if (ul) {\n                e.className = 'validation-summary-errors';\n                e.appendChild(ul.cloneNode(true));\n            } else {\n                e.className = 'validation-summary-valid';\n            }\n        }\n    }\n\n    /**\n     * Adds an error message to an input element, which also updates the validation message elements and validation summary elements.\n     * @param input\n     * @param message\n     */\n    addError(input: HTMLInputElement, message: string) {\n        let spans = this.messageFor[input.name];\n        if (spans) {\n            for (let i = 0; i < spans.length; i++) {\n                spans[i].innerHTML = message;\n                spans[i].className = 'field-validation-error';\n            }\n        }\n\n        input.classList.remove('input-validation-valid');\n        input.classList.add('input-validation-error');\n\n        let uid = this.getElementUID(input);\n        this.summary[uid] = message;\n        this.renderSummary();\n    }\n\n    /**\n     * Removes an error message from an input element, which also updates the validation message elements and validation summary elements.\n     * @param input\n     */\n    removeError(input: HTMLInputElement) {\n        let spans = this.messageFor[input.name];\n        if (spans) {\n            for (let i = 0; i < spans.length; i++) {\n                spans[i].innerHTML = '';\n                spans[i].className = 'field-validation-valid';\n            }\n        }\n\n        input.classList.remove('input-validation-error');\n        input.classList.add('input-validation-valid');\n\n        let uid = this.getElementUID(input);\n        delete this.summary[uid];\n        this.renderSummary();\n    }\n\n    /**\n     * Returns a validation Promise factory for an input element, using given validation directives.\n     * @param input\n     * @param directives\n     */\n    createValidator(input: HTMLInputElement, directives: ValidationDirective) {\n        return async () => {\n\n            // only validate visible fields\n            if (!this.isHidden(input))\n            {\n                for (let key in directives) {\n                    let directive = directives[key];\n                    let provider = this.providers[key];\n\n                    if (!provider) {\n                        console.log('aspnet-validation provider not implemented: ' + key);\n                        continue;\n                    }\n                    this.logger.log(`Running ${key} validator on element`, input);\n\n                    let result = provider(input.value, input, directive.params);\n                    let valid = false;\n                    let error = directive.error;\n\n                    if (typeof result === 'boolean') {\n                        valid = result;\n                    } else if (typeof result === 'string') {\n                        valid = false;\n                        error = result;\n                    } else {\n                        let resolution = await result;\n                        if (typeof resolution === 'boolean') {\n                            valid = resolution;\n                        } else {\n                            valid = false;\n                            error = resolution;\n                        }\n                    }\n\n                    if (!valid) {\n                        this.addError(input, error);\n                        return false;\n                    }\n                }\n            }\n\n            this.removeError(input);\n            return true;\n\n        };\n    }\n\n    /**\n     * Checks if the provided input is hidden from the browser\n     * @param input\n     * @returns\n     */\n    private isHidden(input: HTMLElement) {\n        return !(this.allowHiddenFields || input.offsetWidth || input.offsetHeight || input.getClientRects().length );\n    }\n\n    /**\n     * Load default validation providers and scans the entire document when ready.\n     * @param options.watch If set to true, a MutationObserver will be used to continuously watch for new elements that provide validation directives.\n     */\n    bootstrap(options?: { watch?: boolean, root?: HTMLElement }) {\n        options = options || {};\n        options.root = options.root || window.document.body;\n\n        this.addMvcProviders();\n\n        // If the document is done loading, scan it now.\n        if(window.document.readyState !== 'loading') {\n            this.scan(options.root);\n        }\n        else {\n            // Otherwise wait until the document is done loading.\n            window.document.addEventListener('DOMContentLoaded', event => {\n                this.scan(options.root);\n            });\n        }\n\n        // Watch for further mutations\n        if (options.watch) {\n            this.watch(options.root);\n        }\n    }\n\n    /**\n     * Scans the provided root element for any validation directives and attaches behavior to them.\n     */\n    scan(root: HTMLElement) {\n        this.scanMessages(root);\n        this.scanInputs(root);\n    }\n\n    /**\n     * Watches the provided root element for mutations, and scans for new validation directives to attach behavior.\n     * @param root The root element to use, defaults to the document.documentElement.\n     */\n    watch(root: HTMLElement) {\n        this.observer = new MutationObserver(mutations => {\n            mutations.forEach(mutation => {\n                this.observed(mutation);\n            });\n        });\n        this.observer.observe(root, {\n            attributes: true,\n            childList: true,\n            subtree: true\n        });\n        this.logger.log(\"Watching for mutations\");\n    }\n\n    private observed(mutation: MutationRecord) {\n        if(mutation.type === 'childList') {\n            for(let i = 0; i < mutation.addedNodes.length; i++) {\n                let node = mutation.addedNodes[i];\n                if (node instanceof HTMLElement) {\n                    this.scan(node);\n                }\n            }\n        } else if(mutation.type === 'attributes') {\n            if (mutation.target instanceof HTMLElement) {\n                this.scan(mutation.target);\n            }\n        }\n    }\n}\n"],"sourceRoot":""}
\ No newline at end of file
diff --git a/docs/DEVELOPMENT.md b/docs/DEVELOPMENT.md
index 22fde28..5bb8b8d 100644
--- a/docs/DEVELOPMENT.md
+++ b/docs/DEVELOPMENT.md
@@ -18,4 +18,4 @@ git push --tags
 Now you can go to GitHub to [Draft a new Release](https://github.com/haacked/aspnet-client-validation/releases/new) and click the button to "Auto-generate release notes". Edit the notes accordingly create the Release.
 
 
-When you cerate the Release, the [`release.yml`](../.github/.workflow.release.yml) workflow builds and publishes the package to NPM.
+When you create the Release, the [`release.yml`](../.github/.workflow.release.yml) workflow builds and publishes the package to NPM.
diff --git a/package-lock.json b/package-lock.json
index 1b709fc..933ee9e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "aspnet-client-validation",
-  "version": "0.5.3",
+  "version": "0.7.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "aspnet-client-validation",
-      "version": "0.5.3",
+      "version": "0.7.0",
       "license": "MIT",
       "devDependencies": {
         "ts-loader": "^5.3.1",
diff --git a/package.json b/package.json
index 4319cea..dd10dd7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "aspnet-client-validation",
-  "version": "0.6.0",
+  "version": "0.7.0",
   "description": "Enables ASP.NET MVC client-side validation, without jQuery!",
   "main": "dist/aspnet-validation.js",
   "style": "dist/aspnet-validation.css",
diff --git a/script/build b/script/build
index 9c2f11f..a43c034 100755
--- a/script/build
+++ b/script/build
@@ -1,3 +1,4 @@
 #! /bin/sh
 
+npm install
 npm run-script build
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index fc0217e..1d2d1a7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -13,6 +13,17 @@ interface ElementUID {
     uid: string;
 }
 
+/**
+ * A simple logging interface that mirrors the Console object.
+ */
+export interface Logger {
+    log(message: string, ...args: any[]): void;
+}
+
+const nullLogger = new (class implements Logger {
+    log(_: string, ...args: any[]): void {}
+})();
+
 /**
  * Parameters passed into validation providers from the element attributes.
  * error property is read from data-val-[Provider Name] attribute.
@@ -396,6 +407,13 @@ export class ValidationService {
      */
     allowHiddenFields = false;
 
+    private logger: Logger;
+    observer?: MutationObserver;
+
+    constructor(logger?: Logger) {
+        this.logger = logger || nullLogger;
+    }
+
     /**
      * Registers a new validation plugin of the given name, if not registered yet.
      * Registered plugin validates inputs with data-val-[name] attribute, used as error message.
@@ -408,6 +426,7 @@ export class ValidationService {
             // Allows developers to override the default MVC Providers by adding custom providers BEFORE bootstrap() is called!
             return;
         }
+        this.logger.log(`Registered provider: ${name}`);
         this.providers[name] = callback;
     }
 
@@ -444,8 +463,14 @@ export class ValidationService {
     /**
      * Scans document for all validation message <span> generated by ASP.NET Core MVC, then tracks them.
      */
-    private scanMessages() {
-        let validationMessageElements = document.querySelectorAll('[data-valmsg-for]');
+    private scanMessages(root: HTMLElement) {
+        let validationMessageElements = Array.from(root.querySelectorAll<HTMLElement>('[data-valmsg-for]'));
+
+        // querySelectorAll does not include the root element itself.
+        // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.
+        if (root.hasAttribute("data-valmsg-for")) {
+            validationMessageElements.push(root);
+        }
 
         for (let i = 0; i < validationMessageElements.length; i++) {
             let e = validationMessageElements[i];
@@ -770,8 +795,14 @@ export class ValidationService {
     /**
      * Scans the entire document for input elements to be validated.
      */
-    private scanInputs() {
-        let inputs = document.querySelectorAll('[data-val="true"]');
+    private scanInputs(root: HTMLElement) {
+        let inputs = Array.from(root.querySelectorAll<HTMLElement>('[data-val="true"]'));
+
+        // querySelectorAll does not include the root element itself.
+        // we could use 'matches', but that's newer than querySelectorAll so we'll keep it simple and compatible.
+        if (root.getAttribute("data-val") === "true") {
+            inputs.push(root);
+        }
 
         for (let i = 0; i < inputs.length; i++) {
             let input = inputs[i] as HTMLInputElement;
@@ -890,6 +921,7 @@ export class ValidationService {
                         console.log('aspnet-validation provider not implemented: ' + key);
                         continue;
                     }
+                    this.logger.log(`Running ${key} validator on element`, input);
 
                     let result = provider(input.value, input, directive.params);
                     let valid = false;
@@ -934,22 +966,68 @@ export class ValidationService {
 
     /**
      * Load default validation providers and scans the entire document when ready.
+     * @param options.watch If set to true, a MutationObserver will be used to continuously watch for new elements that provide validation directives.
      */
-    bootstrap() {
+    bootstrap(options?: { watch?: boolean, root?: HTMLElement }) {
+        options = options || {};
+
         this.addMvcProviders();
-        let document = window.document;
-        if(document.readyState === 'complete') {
-            this.scan();
+
+        // If the document is done loading, scan it now.
+        if(window.document.readyState !== 'loading') {
+            this.scan(options.root || window.document.body);
         }
         else {
+            // Otherwise wait until the document is done loading.
             window.document.addEventListener('DOMContentLoaded', event => {
-                this.scan();
+                this.scan(options.root || window.document.body);
             });
         }
+
+        // Watch for further mutations
+        if (options.watch) {
+            this.watch(options.root);
+        }
     }
 
-    private scan() {
-        this.scanMessages();
-        this.scanInputs();
+    /**
+     * Scans the provided root element for any validation directives and attaches behavior to them.
+     */
+    scan(root: HTMLElement) {
+        this.scanMessages(root);
+        this.scanInputs(root);
+    }
+
+    /**
+     * Watches the provided root element for mutations, and scans for new validation directives to attach behavior.
+     * @param root The root element to use, defaults to the document.documentElement.
+     */
+    watch(root: HTMLElement) {
+        this.observer = new MutationObserver(mutations => {
+            mutations.forEach(mutation => {
+                this.observed(mutation);
+            });
+        });
+        this.observer.observe(root, {
+            attributes: true,
+            childList: true,
+            subtree: true
+        });
+        this.logger.log("Watching for mutations");
+    }
+
+    private observed(mutation: MutationRecord) {
+        if(mutation.type === 'childList') {
+            for(let i = 0; i < mutation.addedNodes.length; i++) {
+                let node = mutation.addedNodes[i];
+                if (node instanceof HTMLElement) {
+                    this.scan(node);
+                }
+            }
+        } else if(mutation.type === 'attributes') {
+            if (mutation.target instanceof HTMLElement) {
+                this.scan(mutation.target);
+            }
+        }
     }
 }
diff --git a/tsconfig.json b/tsconfig.json
index 7e84266..05aead0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -26,7 +26,7 @@
     "lib": [
       "dom",
       "es5",
-      "es2015.promise",
+      "es2015",
       "es2018.promise"
     ]
   },
diff --git a/types/index.d.ts b/types/index.d.ts
index 8d07577..7e93688 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -4,6 +4,12 @@
 export interface StringKeyValuePair {
     [key: string]: string;
 }
+/**
+ * A simple logging interface that mirrors the Console object.
+ */
+export interface Logger {
+    log(message: string, ...args: any[]): void;
+}
 /**
  * Parameters passed into validation providers from the element attributes.
  * error property is read from data-val-[Provider Name] attribute.
@@ -119,6 +125,9 @@ export declare class ValidationService {
      * Allow hidden fields validation
      */
     allowHiddenFields: boolean;
+    private logger;
+    observer?: MutationObserver;
+    constructor(logger?: Logger);
     /**
      * Registers a new validation plugin of the given name, if not registered yet.
      * Registered plugin validates inputs with data-val-[name] attribute, used as error message.
@@ -234,7 +243,20 @@ export declare class ValidationService {
     private isHidden;
     /**
      * Load default validation providers and scans the entire document when ready.
+     * @param options.watch If set to true, a MutationObserver will be used to continuously watch for new elements that provide validation directives.
+     */
+    bootstrap(options?: {
+        watch?: boolean;
+        root?: HTMLElement;
+    }): void;
+    /**
+     * Scans the provided root element for any validation directives and attaches behavior to them.
+     */
+    scan(root: HTMLElement): void;
+    /**
+     * Watches the provided root element for mutations, and scans for new validation directives to attach behavior.
+     * @param root The root element to use, defaults to the document.documentElement.
      */
-    bootstrap(): void;
-    private scan;
+    watch(root: HTMLElement): void;
+    private observed;
 }
diff --git a/yarn.lock b/yarn.lock
index b1c28be..9f9ce35 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -908,6 +908,11 @@
   "resolved" "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.2.tgz"
   "version" "3.5.2"
 
+"file-uri-to-path@1.0.0":
+  "integrity" "sha512-0Zt+s3L7Vf1biwWZ29aARiVYLx7iMGnEUl9x33fbB/j3jR81u/O2LbqK+Bm1CDSNDKVtJ/YjwY7TUd5SkeLQLw=="
+  "resolved" "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz"
+  "version" "1.0.0"
+
 "fill-range@^4.0.0":
   "integrity" "sha1-1USBHUKPmOsGpj3EAtJAPDKMOPc="
   "resolved" "https://registry.npmjs.org/fill-range/-/fill-range-4.0.0.tgz"
@@ -994,6 +999,11 @@
   "resolved" "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz"
   "version" "1.0.0"
 
+"fsevents@~2.1.2":
+  "integrity" "sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ=="
+  "resolved" "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz"
+  "version" "2.1.3"
+
 "get-caller-file@^2.0.1":
   "integrity" "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg=="
   "resolved" "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz"