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* File: iframeSizer.contentWindow.js\n * Desc: Include this file in any page being loaded into an iframe\n *       to force the iframe to resize to the content size.\n * Requires: iframeResizer.js on host page.\n * Author: David J. Bradshaw - dave@bradshaw.net\n * Contributor: Jure Mav - jure.mav@gmail.com\n */\n\n;(function() {\n\t'use strict';\n\n\tvar\n\t\tautoResize            = true,\n\t\tbase                  = 10,\n\t\tbodyBackground        = '',\n\t\tbodyMargin            = 0,\n\t\tbodyMarginStr         = '',\n\t\tbodyPadding           = '',\n\t\tcalculateWidth        = false,\n\t\tdoubleEventList       = {'resize':1,'click':1},\n\t\teventCancelTimer      = 128,\n\t\theight                = 1,\n\t\tfirstRun              = true,\n\t\theightCalcModeDefault = 'offset',\n\t\theightCalcMode        = heightCalcModeDefault,\n\t\tinitLock              = true,\n\t\tinitMsg               = '',\n\t\tinterval              = 32,\n\t\tlogging               = false,\n\t\tmsgID                 = '[iFrameSizer]',  //Must match host page msg ID\n\t\tmsgIdLen              = msgID.length,\n\t\tmyID                  = '',\n\t\tpublicMethods         = false,\n\t\tresetRequiredMethods  = {max:1,scroll:1,bodyScroll:1,documentElementScroll:1},\n\t\ttargetOriginDefault   = '*',\n\t\ttarget                = window.parent,\n\t\ttolerance             = 0,\n\t\ttriggerLocked         = false,\n\t\ttriggerLockedTimer    = null,\n\t\twidth                 = 1;\n\n\n\tfunction addEventListener(el,evt,func){\n\t\tif ('addEventListener' in window){\n\t\t\tel.addEventListener(evt,func, false);\n\t\t} else if ('attachEvent' in window){ //IE\n\t\t\tel.attachEvent('on'+evt,func);\n\t\t}\n\t}\n\n\tfunction formatLogMsg(msg){\n\t\treturn msgID + '[' + myID + ']' + ' ' + msg;\n\t}\n\n\tfunction log(msg){\n\t\tif (logging && ('object' === typeof window.console)){\n\t\t\tconsole.log(formatLogMsg(msg));\n\t\t}\n\t}\n\n\tfunction warn(msg){\n\t\tif ('object' === typeof window.console){\n\t\t\tconsole.warn(formatLogMsg(msg));\n\t\t}\n\t}\n\n\n\tfunction init(){\n\t\tlog('Initialising iFrame');\n\t\treadData();\n\t\tsetMargin();\n\t\tsetBodyStyle('background',bodyBackground);\n\t\tsetBodyStyle('padding',bodyPadding);\n\t\tinjectClearFixIntoBodyElement();\n\t\tcheckHeightMode();\n\t\tstopInfiniteResizingOfIFrame();\n\t\tsetupPublicMethods();\n\t\tstartEventListeners();\n\t\tsendSize('init','Init message from host page');\n\t}\n\n\tfunction readData(){\n\n\t\tvar data = initMsg.substr(msgIdLen).split(':');\n\n\t\tfunction strBool(str){\n\t\t\treturn 'true' === str ? true : false;\n\t\t}\n\n\t\tmyID             = data[0];\n\t\tbodyMargin       = (undefined !== data[1]) ? Number(data[1])   : bodyMargin; //For V1 compatibility\n\t\tcalculateWidth   = (undefined !== data[2]) ? strBool(data[2])  : calculateWidth;\n\t\tlogging          = (undefined !== data[3]) ? strBool(data[3])  : logging;\n\t\tinterval         = (undefined !== data[4]) ? Number(data[4])   : interval;\n\t\tpublicMethods    = (undefined !== data[5]) ? strBool(data[5])  : publicMethods;\n\t\tautoResize       = (undefined !== data[6]) ? strBool(data[6])  : autoResize;\n\t\tbodyMarginStr    = data[7];\n\t\theightCalcMode   = (undefined !== data[8]) ? data[8]           : heightCalcMode;\n\t\tbodyBackground   = data[9];\n\t\tbodyPadding      = data[10];\n\t\ttolerance        = (undefined !== data[11]) ? Number(data[11]) : tolerance;\n\t}\n\n\tfunction chkCSS(attr,value){\n\t\tif (-1 !== value.indexOf('-')){\n\t\t\twarn('Negative CSS value ignored for '+attr);\n\t\t\tvalue='';\n\t\t}\n\t\treturn value;\n\t}\n\n\tfunction setBodyStyle(attr,value){\n\t\tif ((undefined !== value) && ('' !== value) && ('null' !== value)){\n\t\t\tdocument.body.style[attr] = value;\n\t\t\tlog('Body '+attr+' set to \"'+value+'\"');\n\t\t}\n\t}\n\n\tfunction setMargin(){\n\t\t//If called via V1 script, convert bodyMargin from int to str \n\t\tif (undefined === bodyMarginStr){\n\t\t\tbodyMarginStr = bodyMargin+'px';\n\t\t}\n\t\tchkCSS('margin',bodyMarginStr);\n\t\tsetBodyStyle('margin',bodyMarginStr);\n\t}\n\n\tfunction stopInfiniteResizingOfIFrame(){\n\t\tdocument.documentElement.style.height = '';\n\t\tdocument.body.style.height = '';\n\t\tlog('HTML & body height set to \"auto\"');\n\t}\n\n\tfunction initWindowResizeListener(){\n\t\taddEventListener(window,'resize', function(){\n\t\t\tsendSize('resize','Window resized');\n\t\t});\n\t}\n\n\tfunction initWindowClickListener(){\n\t\taddEventListener(window,'click', function(){\n\t\t\tsendSize('click','Window clicked');\n\t\t});\n\t}\n\n\tfunction checkHeightMode(){\n\t\tif (heightCalcModeDefault !== heightCalcMode){\n\t\t\tif (!(heightCalcMode in getHeight)){\n\t\t\t\twarn(heightCalcMode + ' is not a valid option for heightCalculationMethod.');\n\t\t\t\theightCalcMode='bodyScroll';\n\t\t\t}\n\t\t\tlog('Height calculation method set to \"'+heightCalcMode+'\"');\n\t\t}\n\t}\n\n\tfunction startEventListeners(){\n\t\tif ( true === autoResize ) {\n\t\t\tinitWindowResizeListener();\n\t\t\tinitWindowClickListener();\n\t\t\tsetupMutationObserver();\n\t\t}\n\t\telse {\n\t\t\tlog('Auto Resize disabled');\n\t\t}\n\t}\n\n\tfunction injectClearFixIntoBodyElement(){\n\t\tvar clearFix = document.createElement('div');\n\t\tclearFix.style.clear = 'both';\n\t\tclearFix.style.display = 'block'; //Guard against this having been globally redefined in CSS.\n\t\tdocument.body.appendChild(clearFix);\n\t}\n\n\tfunction setupPublicMethods(){\n\t\tif (publicMethods) {\n\t\t\tlog('Enable public methods');\n\n\t\t\twindow.parentIFrame = {\n\t\t\t\tclose: function closeF(){\n\t\t\t\t\tsendSize('close','parentIFrame.close()', 0, 0);\n\t\t\t\t},\n\t\t\t\tgetId: function getIdF(){\n\t\t\t\t\treturn myID;\n\t\t\t\t},\n\t\t\t\treset: function resetF(){\n\t\t\t\t\tresetIFrame('parentIFrame.size');\n\t\t\t\t},\n\t\t\t\tscrollTo: function scrollToF(x,y){\n\t\t\t\t\tsendMsg(y,x,'scrollTo'); // X&Y reversed at sendMsg uses hieght/width\n\t\t\t\t},\n\t\t\t\tscrollToOffset: function scrollToF(x,y){\n\t\t\t\t\tsendMsg(y,x,'scrollToOffset'); // X&Y reversed at sendMsg uses hieght/width\n\t\t\t\t},\n\t\t\t\tsendMessage: function sendMessageF(msg,targetOrigin){\n\t\t\t\t\tsendMsg(0,0,'message',JSON.stringify(msg),targetOrigin);\n\t\t\t\t},\n\t\t\t\tsetHeightCalculationMethod: function setHeightCalculationMethodF(heightCalculationMethod){\n\t\t\t\t\theightCalcMode = heightCalculationMethod;\n\t\t\t\t\tcheckHeightMode();\n\t\t\t\t},\n\t\t\t\tsetTargetOrigin: function setTargetOriginF(targetOrigin){\n\t\t\t\t\tlog('Set targetOrigin: '+targetOrigin);\n\t\t\t\t\ttargetOriginDefault = targetOrigin;\n\t\t\t\t},\n\t\t\t\tsize: function sizeF(customHeight, customWidth){\n\t\t\t\t\tvar valString = ''+(customHeight?customHeight:'')+(customWidth?','+customWidth:'');\n\t\t\t\t\tlockTrigger();\n\t\t\t\t\tsendSize('size','parentIFrame.size('+valString+')', customHeight, customWidth);\n\t\t\t\t}\n\t\t\t};\n\t\t}\n\t}\n\n\tfunction initInterval(){\n\t\tif ( 0 !== interval ){\n\t\t\tlog('setInterval: '+interval+'ms');\n\t\t\tsetInterval(function(){\n\t\t\t\tsendSize('interval','setInterval: '+interval);\n\t\t\t},Math.abs(interval));\n\t\t}\n\t}\n\n\tfunction setupInjectElementLoadListners(mutations){\n\t\tfunction addLoadListener(element){\n\t\t\tif (element.height === undefined || element.width === undefined || 0 === element.height || 0 === element.width){\n\t\t\t\tlog('Attach listerner to '+element.src);\n\t\t\t\taddEventListener(element,'load', function imageLoaded(){\n\t\t\t\t\tsendSize('imageLoad','Image loaded');\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\n\t\tmutations.forEach(function (mutation) {\n\t\t\tif (mutation.type === 'attributes' && mutation.attributeName === 'src'){\n\t\t\t\taddLoadListener(mutation.target);\n\t\t\t} else if (mutation.type === 'childList'){\n\t\t\t\tvar images = mutation.target.querySelectorAll('img');\n\t\t\t\tArray.prototype.forEach.call(images,function (image) {\n\t\t\t\t\taddLoadListener(image);\n\t\t\t\t});\n\t\t\t}\n\t\t});\n\t}\n\n\tfunction setupMutationObserver(){\n\n\t\tvar MutationObserver = window.MutationObserver || window.WebKitMutationObserver;\n\n\t\tfunction createMutationObserver(){\n\t\t\tvar\n\t\t\t\ttarget = document.querySelector('body'),\n\n\t\t\t\tconfig = {\n\t\t\t\t\tattributes            : true,\n\t\t\t\t\tattributeOldValue     : false,\n\t\t\t\t\tcharacterData         : true,\n\t\t\t\t\tcharacterDataOldValue : false,\n\t\t\t\t\tchildList             : true,\n\t\t\t\t\tsubtree               : true\n\t\t\t\t},\n\n\t\t\t\tobserver = new MutationObserver(function(mutations) {\n\t\t\t\t\tsendSize('mutationObserver','mutationObserver: ' + mutations[0].target + ' ' + mutations[0].type);\n\t\t\t\t\tsetupInjectElementLoadListners(mutations); //Deal with WebKit asyncing image loading when tags are injected into the page\n\t\t\t\t});\n\n\t\t\tlog('Enable MutationObserver');\n\t\t\tobserver.observe(target, config);\n\t\t}\n\n\t\tif (MutationObserver){\n\t\t\tif (0 > interval) {\n\t\t\t\tinitInterval();\n\t\t\t} else {\n\t\t\t\tcreateMutationObserver();\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\twarn('MutationObserver not supported in this browser!');\n\t\t\tinitInterval();\n\t\t}\n\t}\n\n\n\t// document.documentElement.offsetHeight is not reliable, so\n\t// we have to jump through hoops to get a better value.\n\tfunction getBodyOffsetHeight(){\n\t\tfunction getComputedBodyStyle(prop) {\n\t\t\tfunction convertUnitsToPxForIE8(value) {\n\t\t\t\tvar PIXEL = /^\\d+(px)?$/i;\n\n\t\t\t\tif (PIXEL.test(value)) {\n\t\t\t\t\treturn parseInt(value,base);\n\t\t\t\t}\n\n\t\t\t\tvar\n\t\t\t\t\tstyle = el.style.left,\n\t\t\t\t\truntimeStyle = el.runtimeStyle.left;\n\n\t\t\t\tel.runtimeStyle.left = el.currentStyle.left;\n\t\t\t\tel.style.left = value || 0;\n\t\t\t\tvalue = el.style.pixelLeft;\n\t\t\t\tel.style.left = style;\n\t\t\t\tel.runtimeStyle.left = runtimeStyle;\n\n\t\t\t\treturn value;\n\t\t\t}\n\n\t\t\tvar\n\t\t\t\tel = document.body,\n\t\t\t\tretVal = 0;\n\n\t\t\tif (('defaultView' in document) && ('getComputedStyle' in document.defaultView)) {\n\t\t\t\tretVal = document.defaultView.getComputedStyle(el, null);\n\t\t\t\tretVal = (null !== retVal) ? retVal[prop] : 0;\n\t\t\t} else {//IE8\n\t\t\t\tretVal =  convertUnitsToPxForIE8(el.currentStyle[prop]);\n\t\t\t}\n\n\t\t\treturn parseInt(retVal,base);\n\t\t}\n\n\t\treturn  document.body.offsetHeight +\n\t\t\t\tgetComputedBodyStyle('marginTop') +\n\t\t\t\tgetComputedBodyStyle('marginBottom');\n\t}\n\n\tfunction getBodyScrollHeight(){\n\t\treturn document.body.scrollHeight;\n\t}\n\n\tfunction getDEOffsetHeight(){\n\t\treturn document.documentElement.offsetHeight;\n\t}\n\n\tfunction getDEScrollHeight(){\n\t\treturn document.documentElement.scrollHeight;\n\t}\n\n\t//From https://github.com/guardian/iframe-messenger\n\tfunction getLowestElementHeight() {\n\t\tvar\n\t\t\tallElements       = document.querySelectorAll('body *'),\n\t\t\tallElementsLength = allElements.length,\n\t\t\tmaxBottomVal      = 0,\n\t\t\ttimer             = new Date().getTime();\n\n\t\tfor (var i = 0; i < allElementsLength; i++) {\n\t\t\tif (allElements[i].getBoundingClientRect().bottom > maxBottomVal) {\n\t\t\t\tmaxBottomVal = allElements[i].getBoundingClientRect().bottom;\n\t\t\t}\n\t\t}\n\n\t\ttimer = new Date().getTime() - timer;\n\n\t\tlog('Parsed '+allElementsLength+' HTML elements');\n\t\tlog('LowestElement bottom position calculated in ' + timer + 'ms');\n\n\t\treturn maxBottomVal;\n\t}\n\n\tfunction getAllHeights(){\n\t\treturn [\n\t\t\tgetBodyOffsetHeight(),\n\t\t\tgetBodyScrollHeight(),\n\t\t\tgetDEOffsetHeight(),\n\t\t\tgetDEScrollHeight()\n\t\t];\n\t}\n\n\tfunction getMaxHeight(){\n\t\treturn Math.max.apply(null,getAllHeights());\n\t}\n\n\tfunction getMinHeight(){\n\t\treturn Math.min.apply(null,getAllHeights());\n\t}\n\n\tfunction getBestHeight(){\n\t\treturn Math.max(getBodyOffsetHeight(),getLowestElementHeight());\n\t}\n\n\tvar getHeight = {\n\t\toffset                : getBodyOffsetHeight, //Backward compatability\n\t\tbodyOffset            : getBodyOffsetHeight,\n\t\tbodyScroll            : getBodyScrollHeight,\n\t\tdocumentElementOffset : getDEOffsetHeight,\n\t\tscroll                : getDEScrollHeight, //Backward compatability\n\t\tdocumentElementScroll : getDEScrollHeight,\n\t\tmax                   : getMaxHeight,\n\t\tmin                   : getMinHeight,\n\t\tgrow                  : getMaxHeight,\n\t\tlowestElement         : getBestHeight\n\t};\n\n\tfunction getWidth(){\n\t\treturn Math.max(\n\t\t\tdocument.documentElement.scrollWidth,\n\t\t\tdocument.body.scrollWidth\n\t\t);\n\t}\n\n\tfunction sendSize(triggerEvent, triggerEventDesc, customHeight, customWidth){\n\n\t\tvar\tcurrentHeight,currentWidth;\n\n\t\tfunction recordTrigger(){\n\t\t\tif (!(triggerEvent in {'reset':1,'resetPage':1,'init':1})){\n\t\t\t\tlog( 'Trigger event: ' + triggerEventDesc );\n\t\t\t}\n\t\t}\n\n\t\tfunction resizeIFrame(){\n\t\t\theight = currentHeight;\n\t\t\twidth  = currentWidth;\n\n\t\t\tsendMsg(height,width,triggerEvent);\n\t\t}\n\n\t\tfunction isDoubleFiredEvent(){\n\t\t\treturn  triggerLocked && (triggerEvent in doubleEventList);\n\t\t}\n\n\t\tfunction isSizeChangeDetected(){\n\t\t\tfunction checkTolarance(a,b){\n\t\t\t\tvar retVal = Math.abs(a-b) <= tolerance;\n\t\t\t\treturn !retVal;\n\t\t\t}\n\n\t\t\tcurrentHeight = (undefined !== customHeight)  ? customHeight : getHeight[heightCalcMode]();\n\t\t\tcurrentWidth  = (undefined !== customWidth )  ? customWidth  : getWidth();\n\n\t\t\treturn\tcheckTolarance(height,currentHeight) ||\n\t\t\t\t\t(calculateWidth && checkTolarance(width,currentWidth));\n\n\t\t\t//return\t(height !== currentHeight) ||\n\t\t\t//\t\t(calculateWidth && width !== currentWidth);\n\t\t}\n\n\t\tfunction isForceResizableEvent(){\n\t\t\treturn !(triggerEvent in {'init':1,'interval':1,'size':1});\n\t\t}\n\n\t\tfunction isForceResizableHeightCalcMode(){\n\t\t\treturn (heightCalcMode in resetRequiredMethods);\n\t\t}\n\n\t\tfunction logIgnored(){\n\t\t\tlog('No change in size detected');\n\t\t}\n\n\t\tfunction checkDownSizing(){\n\t\t\tif (isForceResizableEvent() && isForceResizableHeightCalcMode()){\n\t\t\t\tresetIFrame(triggerEventDesc);\n\t\t\t} else if (!(triggerEvent in {'interval':1})){\n\t\t\t\trecordTrigger();\n\t\t\t\tlogIgnored();\n\t\t\t}\n\t\t}\n\n\t\tif (!isDoubleFiredEvent()){\n\t\t\tif (isSizeChangeDetected()){\n\t\t\t\trecordTrigger();\n\t\t\t\tlockTrigger();\n\t\t\t\tresizeIFrame();\n\t\t\t} else {\n\t\t\t\tcheckDownSizing();\n\t\t\t}\n\t\t} else {\n\t\t\tlog('Trigger event cancelled: '+triggerEvent);\n\t\t}\n\t}\n\n\tfunction lockTrigger(){\n\t\tif (!triggerLocked){\n\t\t\ttriggerLocked = true;\n\t\t\tlog('Trigger event lock on');\n\t\t}\n\t\tclearTimeout(triggerLockedTimer);\n\t\ttriggerLockedTimer = setTimeout(function(){\n\t\t\ttriggerLocked = false;\n\t\t\tlog('Trigger event lock off');\n\t\t\tlog('--');\n\t\t},eventCancelTimer);\n\t}\n\n\tfunction triggerReset(triggerEvent){\n\t\theight = getHeight[heightCalcMode]();\n\t\twidth  = getWidth();\n\n\t\tsendMsg(height,width,triggerEvent);\n\t}\n\n\tfunction resetIFrame(triggerEventDesc){\n\t\tvar hcm = heightCalcMode;\n\t\theightCalcMode = heightCalcModeDefault;\n\n\t\tlog('Reset trigger event: ' + triggerEventDesc);\n\t\tlockTrigger();\n\t\ttriggerReset('reset');\n\n\t\theightCalcMode = hcm;\n\t}\n\n\tfunction sendMsg(height,width,triggerEvent,msg,targetOrigin){\n\t\tfunction setTargetOrigin(){\n\t\t\tif (undefined === targetOrigin){\n\t\t\t\ttargetOrigin = targetOriginDefault;\n\t\t\t} else {\n\t\t\t\tlog('Message targetOrigin: '+targetOrigin);\n\t\t\t}\n\t\t}\n\n\t\tfunction sendToParent(){\n\t\t\tvar\n\t\t\t\tsize  = height + ':' + width,\n\t\t\t\tmessage = myID + ':' +  size + ':' + triggerEvent + (undefined !== msg ? ':' + msg : '');\n\n\t\t\tlog('Sending message to host page (' + message + ')');\n\t\t\ttarget.postMessage( msgID + message, targetOrigin);\n\t\t}\n\n\t\tsetTargetOrigin();\n\t\tsendToParent();\n\t}\n\n\tfunction receiver(event) {\n\t\tfunction isMessageForUs(){\n\t\t\treturn msgID === (''+event.data).substr(0,msgIdLen); //''+ Protects against non-string messages\n\t\t}\n\n\t\tfunction initFromParent(){\n\t\t\tinitMsg = event.data;\n\t\t\ttarget  = event.source;\n\n\t\t\tinit();\n\t\t\tfirstRun = false;\n\t\t\tsetTimeout(function(){ initLock = false;},eventCancelTimer);\n\t\t}\n\n\t\tfunction resetFromParent(){\n\t\t\tif (!initLock){\n\t\t\t\tlog('Page size reset by host page');\n\t\t\t\ttriggerReset('resetPage');\n\t\t\t} else {\n\t\t\t\tlog('Page reset ignored by init');\n\t\t\t}\n\t\t}\n\n\t\tfunction getMessageType(){\n\t\t\treturn event.data.split(']')[1];\n\t\t}\n\n\t\tfunction isMiddleTier(){\n\t\t\treturn ('iFrameResize' in window);\n\t\t}\n\n\t\tfunction isInitMsg(){\n\t\t\t//test if this message is from a child below us. This is an ugly test, however, updating\n\t\t\t//the message format would break backwards compatibity.\n\t\t\treturn event.data.split(':')[2] in {'true':1,'false':1};\n\t\t}\n\n\t\tif (isMessageForUs()){\n\t\t\tif (firstRun && isInitMsg()){ //Check msg ID\n\t\t\t\tinitFromParent();\n\t\t\t} else if ('reset' === getMessageType()){\n\t\t\t\tresetFromParent();\n\t\t\t} else if (event.data !== initMsg && !isMiddleTier()){\n\t\t\t\twarn('Unexpected message ('+event.data+')');\n\t\t\t}\n\t\t}\n\t}\n\n\taddEventListener(window, 'message', receiver);\n\n})();\n"]}