ie8.max.js

/*!
Copyright (C) 2013 by WebReflection

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

*/
(function(window){
  /*! (C) WebReflection Mit Style License */
  if (document.createEvent) return;
  var
    DUNNOABOUTDOMLOADED = true,
    READYEVENTDISPATCHED = false,
    ONREADYSTATECHANGE = 'onreadystatechange',
    DOMCONTENTLOADED = 'DOMContentLoaded',
    SECRET = '__IE8__' + Math.random(),
    Object = window.Object,
    defineProperty = Object.defineProperty ||
    // just in case ...
    function (object, property, descriptor) {
      object[property] = descriptor.value;
    },
    defineProperties = Object.defineProperties ||
    // IE8 implemented defineProperty but not the plural...
    function (object, descriptors) {
      for(var key in descriptors) {
        if (hasOwnProperty.call(descriptors, key)) {
          try {
            defineProperty(object, key, descriptors[key]);
          } catch(o_O) {
            if (window.console) {
              console.log(key + ' failed on object:', object, o_O.message);
            }
          }
        }
      }
    },
    getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor,
    hasOwnProperty = Object.prototype.hasOwnProperty,
    // here IE7 will break like a charm
    ElementPrototype = window.Element.prototype,
    TextPrototype = window.Text.prototype,
    // none of above native constructors exist/are exposed
    possiblyNativeEvent = /^[a-z]+$/,
    // ^ actually could probably be just /^[a-z]+$/
    readyStateOK = /loaded|complete/,
    types = {},
    div = document.createElement('div')
  ;

  function commonEventLoop(currentTarget, e, $handlers, synthetic) {
    for(var
      continuePropagation,
      handlers = $handlers.slice(),
      evt = enrich(e, currentTarget),
      i = 0, length = handlers.length; i < length; i++
    ) {
      handler = handlers[i];
      if (
        typeof handler === 'object' &&
        typeof handler.handleEvent === 'function'
      ) {
        handler.handleEvent(evt);
      } else {
        handler.call(currentTarget, evt);
      }
      if (evt.stoppedImmediatePropagation) break;
    }
    continuePropagation = !evt.stoppedPropagation;
    /*
    if (continuePropagation && !synthetic && !live(currentTarget)) {
      evt.cancelBubble = true;
    }
    */
    return (
      synthetic &&
      continuePropagation &&
      currentTarget.parentNode
    ) ?
      currentTarget.parentNode.dispatchEvent(evt) :
      !evt.defaultPrevented
    ;
  }

  function commonDescriptor(get, set) {
    return {
      // if you try with enumerable: true
      // IE8 will miserably fail
      configurable: true,
      get: get,
      set: set
    };
  }

  function commonTextContent(protoDest, protoSource, property) {
    var descriptor = getOwnPropertyDescriptor(
      protoSource || protoDest, property
    );
    defineProperty(
      protoDest,
      'textContent',
      commonDescriptor(
        function () {
          return descriptor.get.call(this);
        },
        function (textContent) {
          descriptor.set.call(this, textContent);
        }
      )
    );
  }

  function enrich(e, currentTarget) {
    e.currentTarget = currentTarget;
    e.eventPhase = (
      // AT_TARGET : BUBBLING_PHASE
      e.target === e.currentTarget ? 2 : 3
    );
    return e;
  }

  function find(array, value) {
    var i = array.length;
    while(i-- && array[i] !== value);
    return i;
  }

  function getTextContent() {
    if (this.tagName === 'BR') return '\n';
    var
      textNode = this.firstChild,
      arrayContent = []
    ;
    while(textNode) {
      if (textNode.nodeType !== 8 && textNode.nodeType !== 7) {
        arrayContent.push(textNode.textContent);
      }
      textNode = textNode.nextSibling;
    }
    return arrayContent.join('');
  }

  function live(self) {
    return self.nodeType !== 9 && document.documentElement.contains(self);
  }

  function onReadyState(e) {
    if (!READYEVENTDISPATCHED && readyStateOK.test(
      document.readyState
    )) {
      READYEVENTDISPATCHED = !READYEVENTDISPATCHED;
      document.detachEvent(ONREADYSTATECHANGE, onReadyState);
      e = document.createEvent('Event');
      e.initEvent(DOMCONTENTLOADED, true, true);
      document.dispatchEvent(e);
    }
  }

  function setTextContent(textContent) {
    var node;
    while ((node = this.lastChild)) {
      this.removeChild(node);
    }
    if (textContent != null) {
      this.appendChild(document.createTextNode(textContent));
    }
  }

  function verify(self, e) {
    if (!e) {
      e = window.event;
    }
    if (!e.target) {
      e.target = e.srcElement || e.fromElement || document;
    }
    if (!e.timeStamp) {
      e.timeStamp = (new Date).getTime();
    }
    return e;
  }

  // normalized textContent for:
  //  comment, script, style, text, title
  commonTextContent(
    window.HTMLCommentElement.prototype,
    ElementPrototype,
    'nodeValue'
  );

  commonTextContent(
    window.HTMLScriptElement.prototype,
    null,
    'text'
  );

  commonTextContent(
    TextPrototype,
    null,
    'nodeValue'
  );

  commonTextContent(
    window.HTMLTitleElement.prototype,
    null,
    'text'
  );

  defineProperty(
    window.HTMLStyleElement.prototype,
    'textContent',
    (function(descriptor){
      return commonDescriptor(
        function () {
          return descriptor.get.call(this.styleSheet);
        },
        function (textContent) {
          descriptor.set.call(this.styleSheet, textContent);
        }
      );
    }(getOwnPropertyDescriptor(window.CSSStyleSheet.prototype, 'cssText')))
  );

  defineProperties(
    ElementPrototype,
    {
      // bonus
      textContent: {
        get: getTextContent,
        set: setTextContent
      },
      // http://www.w3.org/TR/ElementTraversal/#interface-elementTraversal
      firstElementChild: {
        get: function () {
          for(var
            childNodes = this.childNodes || [],
            i = 0, length = childNodes.length;
            i < length; i++
          ) {
            if (childNodes[i].nodeType == 1) return childNodes[i];
          }
        }
      },
      lastElementChild: {
        get: function () {
          for(var
            childNodes = this.childNodes || [],
            i = childNodes.length;
            i--;
          ) {
            if (childNodes[i].nodeType == 1) return childNodes[i];
          }
        }
      },
      previousElementSibling: {
        get: function () {
          var previousElementSibling = this.previousSibling;
          while (previousElementSibling && previousElementSibling.nodeType != 1) {
            previousElementSibling = previousElementSibling.previousSibling;
          }
          return previousElementSibling;
        }
      },
      nextElementSibling: {
        get: function () {
          var nextElementSibling = this.nextSibling;
          while (nextElementSibling && nextElementSibling.nodeType != 1) {
            nextElementSibling = nextElementSibling.nextSibling;
          }
          return nextElementSibling;
        }
      },
      childElementCount: {
        get: function () {
          for(var
            count = 0,
            childNodes = this.childNodes || [],
            i = childNodes.length; i--; count += childNodes[i].nodeType == 1
          );
          return count;
        }
      },
      /*
      // children would be an override
      // IE8 already supports them but with comments too
      // not just nodeType 1
      children: {
        get: function () {
          for(var
            children = [],
            childNodes = this.childNodes || [],
            i = 0, length = childNodes.length;
            i < length; i++
          ) {
            if (childNodes[i].nodeType == 1) {
              children.push(childNodes[i]);
            }
          }
          return children;
        }
      },
      */
      // DOM Level 2 EventTarget methods and events
      addEventListener: {value: function (type, handler, capture) {
        var
          self = this,
          ontype = 'on' + type,
          temple =  self[SECRET] ||
                      defineProperty(
                        self, SECRET, {value: {}}
                      )[SECRET],
          currentType = temple[ontype] || (temple[ontype] = {}),
          handlers  = currentType.h || (currentType.h = []),
          e
        ;
        if (!hasOwnProperty.call(currentType, 'w')) {
          currentType.w = function (e) {
            // e[SECRET] is a silent notification needed to avoid
            // fired events during live test
            return e[SECRET] || commonEventLoop(self, verify(self, e), handlers, false);
          };
          // if not detected yet
          if (!hasOwnProperty.call(types, ontype)) {
            // and potentially a native event
            if(possiblyNativeEvent.test(type)) {
              // do this heavy thing
              try {
                // TODO:  should I consider tagName too so that
                //        INPUT[ontype] could be different ?
                e = document.createEventObject();
                // do not clone ever a node
                // specially a document one ...
                // use the secret to ignore them all
                e[SECRET] = true;
                // document a part if a node has never been
                // added to any other node, fireEvent might
                // behave very weirdly (read: trigger unspecified errors)
                if (self.nodeType != 9 && self.parentNode == null) {
                  div.appendChild(self);
                }
                self.fireEvent(ontype, e);
                types[ontype] = true;
              } catch(e) {
                types[ontype] = false;
                while (div.hasChildNodes()) {
                  div.removeChild(div.firstChild);
                }
              }
            } else {
              // no need to bother since
              // 'x-event' ain't native for sure
              types[ontype] = false;
            }
          }
          if (currentType.n = types[ontype]) {
            self.attachEvent(ontype, currentType.w);
          }
        }
        if (find(handlers, handler) < 0) {
          handlers[capture ? 'unshift' : 'push'](handler);
        }
      }},
      dispatchEvent: {value: function (e) {
        var
          self = this,
          ontype = 'on' + e.type,
          temple =  self[SECRET],
          currentType = temple && temple[ontype],
          valid = !!currentType,
          parentNode
        ;
        if (!e.target) e.target = self;
        return (valid ? (
          currentType.n /* && live(self) */ ?
            self.fireEvent(ontype, e) :
            commonEventLoop(
              self,
              e,
              currentType.h,
              true
            )
        ) : (
          (parentNode = self.parentNode) /* && live(self) */ ?
            parentNode.dispatchEvent(e) :
            true
        )), !e.defaultPrevented;
      }},
      removeEventListener: {value: function (type, handler, capture) {
        var
          self = this,
          ontype = 'on' + type,
          temple =  self[SECRET],
          currentType = temple && temple[ontype],
          handlers = currentType && currentType.h,
          i = handlers ? find(handlers, handler) : -1
        ;
        if (-1 < i) handlers.splice(i, 1);
      }}
    }
  );

  // EventTarget methods for Text nodes too
  defineProperties(TextPrototype, {
    addEventListener: {value: ElementPrototype.addEventListener},
    dispatchEvent: {value: ElementPrototype.dispatchEvent},
    removeEventListener: {value: ElementPrototype.removeEventListener}
  });

  defineProperties(
    window.XMLHttpRequest.prototype,
    {
      addEventListener: {value: function (type, handler, capture) {
        var
          self = this,
          ontype = 'on' + type,
          temple =  self[SECRET] ||
                      defineProperty(
                        self, SECRET, {value: {}}
                      )[SECRET],
          currentType = temple[ontype] || (temple[ontype] = {}),
          handlers  = currentType.h || (currentType.h = [])
        ;
        if (find(handlers, handler) < 0) {
          if (!self[ontype]) {
            self[ontype] = function () {
              var e = document.createEvent('Event');
              e.initEvent(type, true, true);
              self.dispatchEvent(e);
            };
          }
          handlers[capture ? 'unshift' : 'push'](handler);
        }
      }},
      dispatchEvent: {value: function (e) {
        var
          self = this,
          ontype = 'on' + e.type,
          temple =  self[SECRET],
          currentType = temple && temple[ontype],
          valid = !!currentType
        ;
        return valid && (
          currentType.n /* && live(self) */ ?
            self.fireEvent(ontype, e) :
            commonEventLoop(
              self,
              e,
              currentType.h,
              true
            )
        );
      }},
      removeEventListener: {value: ElementPrototype.removeEventListener}
    }
  );

  defineProperties(
    window.Event.prototype,
    {
      bubbles: {value: true, writable: true},
      cancelable: {value: true, writable: true},
      preventDefault: {value: function () {
        if (this.cancelable) {
          this.defaultPrevented = true;
          this.returnValue = false;
        }
      }},
      stopPropagation: {value: function () {
        this.stoppedPropagation = true;
        this.cancelBubble = true;
      }},
      stopImmediatePropagation: {value: function () {
        this.stoppedImmediatePropagation = true;
        this.stopPropagation();
      }},
      initEvent: {value: function(type, bubbles, cancelable){
        this.type = type;
        this.bubbles = !!bubbles;
        this.cancelable = !!cancelable;
        if (!this.bubbles) {
          this.stopPropagation();
        }
      }}
    }
  );

  defineProperties(
    window.HTMLDocument.prototype,
    {
      textContent: {
        get: function () {
          return this.nodeType === 11 ? getTextContent.call(this) : null;
        },
        set: function (textContent) {
          if (this.nodeType === 11) {
            setTextContent.call(this, textContent);
          }
        }
      },
      addEventListener: {value: function(type, handler, capture) {
        var self = this;
        ElementPrototype.addEventListener.call(self, type, handler, capture);
        // NOTE:  it won't fire if already loaded, this is NOT a $.ready() shim!
        //        this behaves just like standard browsers
        if (
          DUNNOABOUTDOMLOADED &&
          type === DOMCONTENTLOADED &&
          !readyStateOK.test(
            self.readyState
          )
        ) {
          DUNNOABOUTDOMLOADED = false;
          self.attachEvent(ONREADYSTATECHANGE, onReadyState);
          if (window == top) {
            (function gonna(e){try{
              self.documentElement.doScroll('left');
              onReadyState();
              }catch(o_O){
              setTimeout(gonna, 50);
            }}());
          }
        }
      }},
      dispatchEvent: {value: ElementPrototype.dispatchEvent},
      removeEventListener: {value: ElementPrototype.removeEventListener},
      createEvent: {value: function(Class){
        var e;
        if (Class !== 'Event') throw new Error('unsupported ' + Class);
        e = document.createEventObject();
        e.timeStamp = (new Date).getTime();
        return e;
      }}
    }
  );

  defineProperties(
    window.Window.prototype,
    {
      getComputedStyle: {value: function(){

        var // partially grabbed from jQuery and Dean's hack
          notpixel = /^(?:[+-]?(?:\d*\.|)\d+(?:[eE][+-]?\d+|))(?!px)[a-z%]+$/,
          position = /^(top|right|bottom|left)$/,
          re = /\-([a-z])/g,
          place = function (match, $1) {
            return $1.toUpperCase();
          }
        ;

        function ComputedStyle(_) {
          this._ = _;
        }

        ComputedStyle.prototype.getPropertyValue = function (name) {
          var
            el = this._,
            style = el.style,
            currentStyle = el.currentStyle,
            runtimeStyle = el.runtimeStyle,
            result,
            left,
            rtLeft
          ;
          name = (name === 'float' ? 'style-float' : name).replace(re, place);
          result = currentStyle ? currentStyle[name] : style[name];
          if (notpixel.test(result) && !position.test(name)) {
            left = style.left;
            rtLeft = runtimeStyle && runtimeStyle.left;
            if (rtLeft) {
              runtimeStyle.left = currentStyle.left;
            }
            style.left = name === 'fontSize' ? '1em' : result;
            result = style.pixelLeft + 'px';
            style.left = left;
            if (rtLeft) {
              runtimeStyle.left = rtLeft;
            }
          }
          return result == null ?
            result : ((result + '') || 'auto');
        };

        // unsupported
        function PseudoComputedStyle() {}
        PseudoComputedStyle.prototype.getPropertyValue = function () {
          return null;
        };

        return function (el, pseudo) {
          return pseudo ?
            new PseudoComputedStyle(el) :
            new ComputedStyle(el);
        };

      }()},

      addEventListener: {value: function (type, handler, capture) {
        var
          self = window,
          ontype = 'on' + type,
          handlers
        ;
        if (!self[ontype]) {
          self[ontype] = function(e) {
            return commonEventLoop(self, verify(self, e), handlers, false);
          };
        }
        handlers = self[ontype][SECRET] || (
          self[ontype][SECRET] = []
        );
        if (find(handlers, handler) < 0) {
          handlers[capture ? 'unshift' : 'push'](handler);
        }
      }},
      dispatchEvent: {value: function (e) {
        var method = window['on' + e.type];
        return method ? method.call(window, e) !== false && !e.defaultPrevented : true;
      }},
      removeEventListener: {value: function (type, handler, capture) {
        var
          ontype = 'on' + type,
          handlers = (window[ontype] || Object)[SECRET],
          i = handlers ? find(handlers, handler) : -1
         ;
        if (-1 < i) handlers.splice(i, 1);
      }}
    }
  );
}(this));