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fd-slider.js
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fd-slider.js
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/*
* Unobtrusive Slider Control / HTML5 Input Range polyfill
* http://www.frequency-decoder.com/
*
* Copyright 2010, 2011, Brian McAllister
* Dual licensed under the MIT or GPL Version 2 licenses.
*
*/
var fdSlider = (function() {
var sliders = {},
uniqueid = 0,
mouseWheelEnabled = true,
fullARIA = true,
describedBy = "fd-slider-describedby",
varSetRules = {
onfocus:true,
onvalue:true
},
noRangeBar = false,
html5Animation = "jump",
isOpera = Object.prototype.toString.call(window.opera) === "[object Opera]",
fpRegExp = /^([-]{0,1}[0-9]+(\.[0-9]+){0,1})$/,
stepRegExp = /^([0-9]+(\.[0-9]+){0,1})$/;
var parseJSON = function(str) {
// Check we have a String
if(typeof str !== 'string' || str == "") { return {}; };
try {
// Does a JSON (native or not) Object exist
if(typeof JSON === "object" && JSON.parse) {
return window.JSON.parse(str);
// Genious code taken from: http://kentbrewster.com/badges/
} else if(/mousewheelenabled|fullaria|describedby|norangebar|html5animation|varsetrules/.test(str.toLowerCase())) {
var f = Function(['var document,top,self,window,parent,Number,Date,Object,Function,',
'Array,String,Math,RegExp,Image,ActiveXObject;',
'return (' , str.replace(/<\!--.+-->/gim,'').replace(/\bfunction\b/g,'function-') , ');'].join(''));
return f();
};
} catch (e) { };
return {"err":"Could not parse the JSON object"};
};
var affectJSON = function(json) {
if(typeof json !== "object") { return; };
for(key in json) {
value = json[key];
switch(key.toLowerCase()) {
case "mousewheelenabled":
mouseWheelEnabled = !!value;
break;
case "fullaria":
fullARIA = !!value;
break;
case "describedby":
describedBy = String(value);
break;
case "norangebar":
noRangeBar = !!value;
break;
case "html5animation":
html5Animation = String(value).search(/^(jump|tween|timed)$/i) != -1 ? String(value).toLowerCase() : "jump";
break;
case "varsetrules":
if("onfocus" in value) {
varSetRules.onfocus = !!value.onfocus;
};
if("onvalue" in value) {
varSetRules.onvalue = !!value.onvalue;
};
break;
};
};
};
// Classic event functions
var addEvent = function(obj, type, fn) {
if( obj.attachEvent ) {
obj["e"+type+fn] = fn;
obj[type+fn] = function(){obj["e"+type+fn]( window.event );};
obj.attachEvent( "on"+type, obj[type+fn] );
} else { obj.addEventListener( type, fn, true ); }
};
var removeEvent = function(obj, type, fn) {
try {
if( obj.detachEvent ) {
obj.detachEvent( "on"+type, obj[type+fn] );
obj[type+fn] = null;
} else { obj.removeEventListener( type, fn, true ); }
} catch(err) {};
};
var stopEvent = function(e) {
e = e || window.event;
if(e.stopPropagation) {
e.stopPropagation();
e.preventDefault();
};
/*@cc_on@*/
/*@if(@_win32)
e.cancelBubble = true;
e.returnValue = false;
/*@end@*/
return false;
};
var preventDefault = function(e) {
e = e || window.event;
if(e.preventDefault) {
e.preventDefault();
return;
};
e.returnValue = false;
};
// Add/Remove classname utility functions
var addClass = function(e,c) {
if(new RegExp("(^|\\s)" + c + "(\\s|$)").test(e.className)) { return; };
e.className += ( e.className ? " " : "" ) + c;
};
var removeClass = function(e,c) {
e.className = !c ? "" : e.className.replace(new RegExp("(^|\\s)" + c + "(\\s|$)"), " ").replace(/^\s\s*/, '').replace(/\s\s*$/, '');
};
// Returns an Object of key value pairs indicating which sliders have values
// that have been "set" by the user
var getValueSet = function() {
var obj = {};
for(id in sliders) {
obj[id] = sliders[id].getValueSet();
};
return obj;
};
// Sets the valueSet variable for a specific slider
var setValueSet = function(sliderId, tf) {
if(!(sliderId in sliders)) return;
sliders[sliderId].setValueSet(!!tf);
};
// Javascript instantiation of a slider (input type="text" or select list)
var createSlider = function(options) {
if(!options || !options.inp || !options.inp.tagName || options.inp.tagName.search(/^input|select/i) == -1) { return false; };
options.html5Shim = false;
if(options.inp.tagName.toLowerCase() == "select") {
if(options.inp.options.length < 2) {
return false;
};
options.min = 0;
options.max = options.inp.options.length - 1;
options.step = 1;
options.precision = 0;
options.scale = false;
options.forceValue = true;
} else {
if(String(options.inp.type).search(/^text$/i) == -1) {
return false;
};
options.min = options.min && String(options.min).search(fpRegExp) != -1 ? +options.min : 0;
options.max = options.max && String(options.max).search(fpRegExp) != -1 ? +options.max : 100;
options.step = options.step && String(options.step).search(stepRegExp) != -1 ? options.step : 1;
options.precision = options.precision && String(options.precision).search(/^[0-9]+$/) != -1 ? options.precision : (String(options.step).search(/\.([0-9]+)$/) != -1 ? String(options.step).match(/\.([0-9]+)$/)[1].length : 0);
options.scale = options.scale || false;
options.forceValue = ("forceValue" in options) ? !!options.forceValue : false;
};
options.maxStep = options.maxStep && String(options.maxStep).search(stepRegExp) != -1 ? +options.maxStep : +options.step * 2;
options.classNames = options.classNames || "";
options.callbacks = options.callbacks || false;
destroySingleSlider(options.inp.id);
sliders[options.inp.id] = new fdRange(options);
return true;
};
var getAttribute = function(elem, att) {
return elem.getAttribute(att) || "";
};
// HTML5 input type="range" shim - called onload or onDomReady
var init = function() {
var inputs = document.getElementsByTagName("input"),
options;
for(var i = 0, inp; inp = inputs[i]; i++) {
if(inp.tagName.toLowerCase() == "input"
&&
inp.type.toLowerCase() == "text"
&&
(getAttribute(inp, "min") && getAttribute(inp, "min").search(fpRegExp) != -1
||
getAttribute(inp, "max") && getAttribute(inp, "max").search(fpRegExp) != -1
||
getAttribute(inp, "step") && getAttribute(inp, "step").search(/^(any|([0-9]+(\.[0-9]+){0,1}))$/i) != -1
)) {
// Skip elements that have already been created are are resident in the DOM
if(inp.id && document.getElementById("fd-slider-"+inp.id)) {
continue;
// Destroy elements that have already been created but not resident in the DOM
} else if(inp.id && !document.getElementById("fd-slider-"+inp.id)) {
destroySingleSlider(inp.id);
};
// Create an id for the form element if necessary
if(!inp.id) { inp.id = "fd-slider-form-elem-" + uniqueid++; };
// Basic option Object
options = {
inp: inp,
callbacks: [],
animation: html5Animation,
vertical: getAttribute(inp, "data-fd-slider-vertical") ? true : !!(inp.offsetHeight > inp.offsetWidth),
classNames: getAttribute(inp, "data-fd-slider-vertical"),
html5Shim: true
};
if(options.vertical && !getAttribute(inp, "data-fd-slider-vertical")) {
options.inpHeight = inp.offsetHeight;
};
options.min = getAttribute(inp, "min") || 0;
options.max = getAttribute(inp, "max") || 100;
options.step = getAttribute(inp, "step").search(/^any$/i) != -1 ? options.max - options.min : getAttribute(inp, "step").search(stepRegExp) != -1 ? inp.getAttribute("step") : 1;
options.precision = String(options.step).search(/\.([0-9]+)$/) != -1 ? String(options.step).match(/\.([0-9]+)$/)[1].length : 0;
options.maxStep = options.step * 2;
destroySingleSlider(options.inp.id);
sliders[options.inp.id] = new fdRange(options);
};
};
return true;
};
var destroySingleSlider = function(id) {
if(id in sliders) {
sliders[id].destroy();
delete sliders[id];
return true;
};
return false;
};
var destroyAllsliders = function(e) {
for(slider in sliders) { sliders[slider].destroy(); };
sliders = [];
};
var unload = function(e) {
destroyAllsliders();
sliders = null;
};
var resize = function(e) {
for(slider in sliders) { sliders[slider].onResize(); };
};
var onDomReady = function() {
removeEvent(window, "load", init);
init();
};
var removeOnLoadEvent = function() {
removeEvent(window, "load", init);
};
function fdRange(options) {
var inp = options.inp,
disabled = false,
tagName = inp.tagName.toLowerCase(),
min = +options.min,
max = +options.max,
rMin = +options.min,
rMax = +options.max,
range = Math.abs(max - min),
step = tagName == "select" ? 1 : +options.step,
maxStep = options.maxStep ? +options.maxStep : step * 2,
precision = options.precision || 0,
steps = Math.ceil(range / step),
scale = options.scale || false,
hideInput = !!options.hideInput,
animation = options.animation || "",
vertical = !!options.vertical,
callbacks = options.callbacks || {},
classNames = options.classNames || "",
html5Shim = !!options.html5Shim,
defaultVal = max < min ? min : min + ((max - min) / 2),
forceValue = html5Shim || !!options.forceValue,
inpHeight = html5Shim && vertical && ("inpHeight" in options) ? options.inpHeight : false,
timer = null,
kbEnabled = true,
sliderH = 0,
sliderW = 0,
tweenX = 0,
tweenB = 0,
tweenC = 0,
tweenD = 0,
frame = 0,
x = 0,
y = 0,
rMaxPx = 0,
rMinPx = 0,
handlePos = 0,
destPos = 0,
mousePos = 0,
stepPx = 0,
userSet = false,
touchEvents = false,
outerWrapper,
wrapper,
handle,
rangeBar,
bar;
// Make sure we have a negative step if the max < min
if(max < min) {
step = -Math.abs(step);
maxStep = -Math.abs(maxStep);
};
// Add the 100% scale mark if needs be
if(scale) {
scale[100] = max;
};
// Set the "userSet" variable programmatically for this slider
function valueSet(tf) {
tf = !!tf;
if(tf != userSet) {
userSet = tf;
valueToPixels(getWorkingValueFromInput());
};
};
function disableSlider(noCallback) {
if(disabled && !noCallback) { return; };
try {
removeEvent(handle, "focus", onFocus);
removeEvent(handle, "blur", onBlur);
if(!isOpera) {
removeEvent(handle, "keydown", onKeyDown);
removeEvent(handle, "keypress", onKeyPress);
} else {
removeEvent(handle, "keypress", onKeyDown);
};
removeEvent(outerWrapper, "mouseover", onMouseOver);
removeEvent(outerWrapper, "mouseout", onMouseOut);
removeEvent(outerWrapper, "mousedown", onMouseDown);
removeEvent(outerWrapper, "touchstart", onMouseDown);
if(mouseWheelEnabled) {
if (window.addEventListener && !window.devicePixelRatio) window.removeEventListener('DOMMouseScroll', trackMouseWheel, false);
else {
removeEvent(document, "mousewheel", trackMouseWheel);
removeEvent(window, "mousewheel", trackMouseWheel);
};
};
} catch(err) {};
clearTimeout(timer);
removeClass(outerWrapper, "fd-slider-focused");
removeClass(outerWrapper, "fd-slider-active");
addClass(outerWrapper, "fd-slider-disabled");
outerWrapper.setAttribute("aria-disabled", true);
inp.disabled = disabled = true;
if(!noCallback) {
callback("disable");
};
};
function enableSlider(noCallback) {
if(!disabled && !noCallback) return;
addEvent(handle, "focus", onFocus);
addEvent(handle, "blur", onBlur);
if(!isOpera) {
addEvent(handle, "keydown", onKeyDown);
addEvent(handle, "keypress", onKeyPress);
} else {
addEvent(handle, "keypress", onKeyDown);
};
addEvent(outerWrapper, "touchstart", onMouseDown);
addEvent(outerWrapper, "mousedown", onMouseDown);
addEvent(outerWrapper, "mouseover", onMouseOver);
addEvent(outerWrapper, "mouseout", onMouseOut);
removeClass(outerWrapper, "fd-slider-disabled");
outerWrapper.setAttribute("aria-disabled", false);
inp.disabled = disabled = touchEvents = false;
if(!noCallback) {
callback("enable");
};
};
// Destroys a slider
function destroySlider() {
// Clear any timeouts
clearTimeout(timer);
// Remove pointers to DOM nodes
wrapper = bar = handle = outerWrapper = timer = null;
// Call the "destroy" callback
callback("destroy");
// Delete the callback functions
callbacks = null;
};
// Calculates the pixel increment etc
function redraw() {
locate();
// Internet Explorer requires the try catch
try {
var sW = outerWrapper.offsetWidth,
sH = outerWrapper.offsetHeight,
hW = handle.offsetWidth,
hH = handle.offsetHeight,
bH = bar.offsetHeight,
bW = bar.offsetWidth,
mPx = vertical ? sH - hH : sW - hW;
stepPx = mPx / steps;
rMinPx = Math.max(scale ? percentToPixels(valueToPercent(rMin)) : Math.abs((rMin - min) / step) * stepPx, 0);
rMaxPx = Math.min(scale ? percentToPixels(valueToPercent(rMax)) : Math.abs((rMax - min) / step) * stepPx, Math.floor(vertical ? sH - hH : sW - hW));
sliderW = sW;
sliderH = sH;
// Use the input value
valueToPixels(html5Shim || forceValue ? getWorkingValueFromInput() : (tagName == "select" ? inp.selectedIndex : parseFloat(inp.value)));
} catch(err) {};
callback("redraw");
};
// Calls a callback function
function callback(type) {
if(!html5Shim) {
if(callbacks.hasOwnProperty(type)) {
var cbObj = {"disabled":disabled, "elem":inp, "value":tagName == "select" ? inp.options[inp.selectedIndex].value : inp.value};
// Call all functions in sequence
for(var i = 0, func; func = callbacks[type][i]; i++) {
func.call(inp, cbObj);
};
};
} else if(type.match(/^(blur|focus|change)$/i)) {
if(typeof(document.createEventObject) != 'undefined') {
try {
var e = document.createEventObject();
inp.fireEvent('on' + type.toLowerCase(), e);
} catch(err){ };
} else if(typeof(document.createEvent) != 'undefined') {
var e = document.createEvent('HTMLEvents');
e.initEvent(type, true, true);
inp.dispatchEvent(e);
};
};
};
// FOCUS & BLUR events
function onFocus(e) {
addClass(outerWrapper, 'fd-slider-focused');
// Is the value said to have been set by the user onfocus
if(varSetRules.onfocus) {
userSet = true;
valueToPixels(getWorkingValueFromInput());
};
// If mousewheel events required then add them
if(mouseWheelEnabled) {
addEvent(window, 'DOMMouseScroll', trackMouseWheel);
addEvent(document, 'mousewheel', trackMouseWheel);
if(!isOpera) addEvent(window, 'mousewheel', trackMouseWheel);
};
// Callback...
callback("focus");
return true;
};
function onBlur(e) {
removeClass(outerWrapper, 'fd-slider-focused');
// Remove mousewheel events if necessary
if(mouseWheelEnabled) {
removeEvent(document, 'mousewheel', trackMouseWheel);
removeEvent(window, 'DOMMouseScroll', trackMouseWheel);
if(!isOpera) removeEvent(window, 'mousewheel', trackMouseWheel);
};
kbEnabled = true;
// Callback...
callback("blur");
};
// MOUSEWHEEL events
function trackMouseWheel(e) {
if(!kbEnabled) return;
e = e || window.event;
var delta = 0;
if (e.wheelDelta) {
delta = e.wheelDelta/120;
// Older versions of Opera require a small hack to inverse the delta
if (isOpera && window.opera.version() < 9.2) delta = -delta;
} else if(e.detail) {
delta = -e.detail/3;
};
if(vertical) { delta = -delta; };
if(delta) {
var value = getWorkingValueFromInput();
value += (delta < 0) ? -step : step;
userSet = true;
valueToPixels(getValidValue(value));
};
return stopEvent(e);
};
// KEYBOARD events
function onKeyPress(e) {
e = e || window.event;
// Let all non-hijacked keyboard events pass
if((e.keyCode >= 33 && e.keyCode <= 40) || !kbEnabled || e.keyCode == 45 || e.keyCode == 46) {
return stopEvent(e);
};
return true;
};
function onKeyDown(e) {
if(!kbEnabled) return true;
e = e || window.event;
var kc = e.keyCode != null ? e.keyCode : e.charCode;
if ( kc < 33 || (kc > 40 && (kc != 45 && kc != 46))) return true;
var value = getWorkingValueFromInput();
if( kc == 37 || kc == 40 || kc == 46 || kc == 34) {
// left, down, ins, page down
value -= (e.ctrlKey || kc == 34 ? +maxStep : +step);
} else if( kc == 39 || kc == 38 || kc == 45 || kc == 33) {
// right, up, del, page up
value += (e.ctrlKey || kc == 33 ? +maxStep : +step);
} else if( kc == 35 ) {
// max
value = rMax;
} else if( kc == 36 ) {
// min
value = rMin;
};
userSet = true;
valueToPixels(getValidValue(value));
callback("update");
// Opera doesn't let us cancel key events so the up/down arrows and home/end buttons will scroll the screen - which sucks
preventDefault(e);
};
// MOUSE & TOUCH events
// Mouseover the slider
function onMouseOver(e) {
addClass(outerWrapper, 'fd-slider-hover');
};
// Mouseout of the slider
function onMouseOut(e) {
// Should really check we are not still in the slider
removeClass(outerWrapper, 'fd-slider-hover');
};
// Mousedown on the slider
function onMouseDown(e) {
e = e || window.event;
// Stop page scrolling
preventDefault(e);
// Grab the event target
var targ;
if (e.target) targ = e.target;
else if (e.srcElement) targ = e.srcElement;
if(targ.nodeType == 3) targ = targ.parentNode;
// Are we using touchEvents
if(e.touches) {
// Skip gestures
if(e.targetTouches && e.targetTouches.length != 1) {
return false;
};
e = e.touches[0];
touchEvents = true;
};
// Stop any animation timers
clearTimeout(timer);
timer = null;
// Not keyboard enabled
kbEnabled = false;
// User has set a value
userSet = true;
// Handle mousedown - initiate drag
if(targ.className.search("fd-slider-handle") != -1) {
mousePos = vertical ? e.clientY : e.clientX;
handlePos = parseInt(vertical ? handle.offsetTop : handle.offsetLeft)||0;
// Set a value on first click even if no movement
trackMouse(e);
if(!touchEvents) {
addEvent(document, 'mousemove', trackMouse);
addEvent(document, 'mouseup', stopDrag);
} else {
addEvent(document, 'touchmove', trackMouse);
addEvent(document, 'touchend', stopDrag);
// Remove mouseEvents to stop them firing after the touch event
removeEvent(outerWrapper, "mousedown", onMouseDown);
};
addClass(outerWrapper, 'fd-slider-active');
addClass(document.body, "fd-slider-drag-" + (vertical ? "vertical" : "horizontal"));
// Wrapper mousedown - initiate animation to click point
} else {
locate();
var posx = 0,
sLft = 0,
sTop = 0;
// Internet Explorer doctype woes
if (document.documentElement && document.documentElement.scrollTop) {
sTop = document.documentElement.scrollTop;
sLft = document.documentElement.scrollLeft;
} else if (document.body) {
sTop = document.body.scrollTop;
sLft = document.body.scrollLeft;
};
if (e.pageX) posx = vertical ? e.pageY : e.pageX;
else if (e.clientX) posx = vertical ? e.clientY + sTop : e.clientX + sLft;
posx -= vertical ? y + Math.round(handle.offsetHeight / 2) : x + Math.round(handle.offsetWidth / 2);
posx = snapToPxValue(posx);
// Tween animation to click point
if(animation == "tween") {
addClass(outerWrapper, 'fd-slider-active');
tweenTo(posx);
// Progressive increment to click point
} else if(animation == "timed") {
addClass(outerWrapper, 'fd-slider-active');
addEvent(document, touchEvents ? 'touchend' : 'mouseup', onDocMouseUp);
destPos = posx;
onTimer();
// Immediate jump to click point
} else {
pixelsToValue(posx);
//addEvent(document, touchEvents ? 'touchend' : 'mouseup', onMouseUp);
};
};
return stopEvent(e);
};
// Progressive increment to click point - clear the animation timer and remove the mouseup/touchend event
function onDocMouseUp( e ) {
e = e || window.event;
preventDefault(e);
removeEvent(document, touchEvents ? 'touchend' : 'mouseup', onDocMouseUp);
removeClass(outerWrapper, "fd-slider-active");
clearTimeout(timer);
timer = null;
kbEnabled = true;
return stopEvent(e);
};
// Mouseup or touchend event on the document to stop drag
function stopDrag(e) {
e = e || window.event;
preventDefault(e);
if(touchEvents) {
removeEvent(document, 'touchmove', trackMouse);
removeEvent(document, 'touchend', stopDrag);
} else {
removeEvent(document, 'mousemove', trackMouse);
removeEvent(document, 'mouseup', stopDrag);
};
kbEnabled = true;
removeClass(document.body, "fd-slider-drag-" + (vertical ? "vertical" : "horizontal"));
removeClass(outerWrapper, "fd-slider-active");
return stopEvent(e);
};
// Mousemove or touchmove event on the drag handle
function trackMouse(e) {
e = e || window.event;
preventDefault(e);
if(e.touches) {
// Skip gestures
if(e.targetTouches && e.targetTouches.length != 1) {
return false;
};
e = e.touches[0];
};
pixelsToValue(snapToPxValue(handlePos + (vertical ? e.clientY - mousePos : e.clientX - mousePos)));
return false;
};
// Increments the slider by "inc" steps
function increment(inc) {
var value = getWorkingValueFromInput();
userSet = true;
value += inc * step;
valueToPixels(getValidValue(value));
};
// Attempts to locate the on-screen position of the slider
function locate(){
var curleft = 0,
curtop = 0,
obj = outerWrapper;
// Try catch for IE's benefit
try {
while (obj.offsetParent) {
curleft += obj.offsetLeft;
curtop += obj.offsetTop;
obj = obj.offsetParent;
};
} catch(err) {};
x = curleft;
y = curtop;
};
// Used during the progressive animation to click point
function onTimer() {
var xtmp = parseInt(vertical ? handle.offsetTop : handle.offsetLeft, 10);
xtmp = Math.round((destPos < xtmp) ? Math.max(destPos, Math.floor(xtmp - stepPx)) : Math.min(destPos, Math.ceil(xtmp + stepPx)));
pixelsToValue(snapToPxValue(xtmp));
if(xtmp != destPos) timer = setTimeout(onTimer, steps > 20 ? 50 : 100);
else {
kbEnabled = true;
removeClass(outerWrapper, "fd-slider-active");
callback("finalise");
};
};
var tween = function(){
frame++;
var c = tweenC,
d = 20,
t = frame,
b = tweenB,
x = Math.ceil((t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b);
pixelsToValue(t == d ? tweenX : x);
if(t!=d) {
// Call the "move" callback on each animation increment
callback("move");
timer = setTimeout(tween, 20);
} else {
clearTimeout(timer);
timer = null;
kbEnabled = true;
removeClass(outerWrapper, "fd-slider-focused");
removeClass(outerWrapper, "fd-slider-active");
// Call the "finalise" callback whenever the animation is complete
callback("finalise");
};
};
function tweenTo(tx){
kbEnabled = false;
tweenX = parseInt(tx, 10);
tweenB = parseInt(vertical ? handle.offsetTop : handle.offsetLeft, 10);
tweenC = tweenX - tweenB;
tweenD = 20;
frame = 0;
if(!timer) { timer = setTimeout(tween, 20); };
};
// Returns a value within the range
function checkValue(value) {
if(isNaN(value) || value === "" || typeof value == "undefined") {
userSet = false;
return defaultVal;
} else if(value < Math.min(rMin,rMax)) {
userSet = false;
return Math.min(rMin,rMax);
} else if(value > Math.max(rMin,rMax)) {
userSet = false;
return Math.max(rMin,rMax);
};
userSet = true;
return value;
};
// Returns a value within a range - uses the form element value as base
function getWorkingValueFromInput() {
return getValidValue(tagName == "input" ? parseFloat(inp.value) : inp.selectedIndex);
};
// Returns a value within the range
function getValidValue(value) {
return (isNaN(value) || value === "" || typeof value == "undefined") ? defaultVal : Math.min(Math.max(value, Math.min(rMin,rMax)), Math.max(rMin,rMax));
};
// Calculates value according to pixel position of slider handle
function pixelsToValue(px) {
var val = getValidValue(scale ? percentToValue(pixelsToPercent(px)) : vertical ? max - (Math.round(px / stepPx) * step) : min + (Math.round(px / stepPx) * step));
handle.style[vertical ? "top" : "left"] = (px || 0) + "px";
redrawRange();
setInputValue((tagName == "select" || step == 1) ? Math.round(val) : val);
};
// Calculates pixel position according to form element value
function valueToPixels(val) {
var clearVal = false,
value;
// Allow empty values for non-polyfill sliders
if((typeof val == "undefined" || isNaN(val) || val === "") && tagName == "input" && !(html5Shim || forceValue)) {
value = defaultVal;
clearVal = true;
userSet = false;
} else {
value = checkValue(val);
};
handle.style[vertical ? "top" : "left"] = (scale ? percentToPixels(valueToPercent(value)) : vertical ? Math.round(((max - value) / step) * stepPx) : Math.round(((value - min) / step) * stepPx)) + "px";
redrawRange();
setInputValue(clearVal ? "" : value);
};
// Rounds a pixel value to the nearest "snap" point on the slider scale
function snapToPxValue(px) {
if(scale) {
return Math.max(Math.min(rMaxPx, px), rMinPx);
} else {
var rem = px % stepPx;
if(rem && rem >= (stepPx / 2)) { px += (stepPx - rem); }
else { px -= rem; };
if(px < Math.min(Math.abs(rMinPx), Math.abs(rMaxPx))) px = Math.min(Math.abs(rMinPx), Math.abs(rMaxPx));
else if(px > Math.max(Math.abs(rMinPx), Math.abs(rMaxPx))) px = Math.max(Math.abs(rMinPx), Math.abs(rMaxPx));
return Math.min(Math.max(px, 0), rMaxPx);
};
};
// Calculates a value according to percentage of distance handle has travelled
function percentToValue(pct) {
var st = 0,
fr = min,
value;
for(var s in scale) {
if(!scale.hasOwnProperty(s)) {
continue;
};
if(pct >= st && pct <= +s ) {
value = fr + ((pct - st) * (+scale[s] - fr) ) / (+s - st);
};
st = +s;
fr = +scale[s];
};
return value;
};
// Calculates the percentage handle position according to form element value
function valueToPercent(value) {
var st = 0,
fr = min,
pct = 0;
for(var s in scale) {
if(!scale.hasOwnProperty(s)) {
continue;
};
if(value >= fr && value <= +scale[s]){
pct = st + (value - fr) * (+s - st) / (+scale[s] - fr);
};
st = +s;
fr = +scale[s];
};
return pct;
};
function percentToPixels(percent) {
return ((outerWrapper[vertical ? "offsetHeight" : "offsetWidth"] - handle[vertical ? "offsetHeight" : "offsetWidth"]) / 100) * percent;
};
function pixelsToPercent(pixels) {
return pixels / ((outerWrapper[vertical ? "offsetHeight" : "offsetWidth"] - outerWrapper[handle ? "offsetHeight" : "offsetWidth"]) / 100);
};
// Sets the form element with a valid value
function setInputValue(val) {
callback("update");
// If the user has not set this value or has entered an incorrect value then set a class
// to enable styling of the slider
if(!userSet) {
addClass(outerWrapper, "fd-slider-no-value");
} else {
removeClass(outerWrapper, "fd-slider-no-value");
};
if(tagName == "select") {
try {
val = parseInt(val, 10);
if(inp.selectedIndex === val) return;
inp.options[val].selected = true;
} catch (err) {};
} else {
if(val != "") {
val = (min + (Math.round((val - min) / step) * step)).toFixed(precision);
};
if(inp.value === val) {
return;
};
inp.value = val;
};
updateAriaValues();
callback("change");
};
function checkInputValue(value) {
return !(isNaN(value) || value === "" || value < Math.min(rMin,rMax) || value > Math.max(rMin,rMax));
};
function setSliderRange(newMin, newMax) {
if(rMin > rMax) {
newMin = Math.min(min, Math.max(newMin, newMax));
newMax = Math.max(max, Math.min(newMin, newMax));
rMin = Math.max(newMin, newMax);
rMax = Math.min(newMin, newMax);
} else {
newMin = Math.max(min, Math.min(newMin, newMax));
newMax = Math.min(max, Math.max(newMin, newMax));
rMin = Math.min(newMin, newMax);
rMax = Math.max(newMin, newMax);
};
if(defaultVal < Math.min(rMin, rMax)) defaultVal = Math.min(rMin, rMax);
else if(defaultVal > Math.max(rMin, rMax)) defaultVal = Math.max(rMin, rMax);
handle.setAttribute("aria-valuemin", rMin);
handle.setAttribute("aria-valuemax", rMax);