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* File: iframeReizer.js\n * Desc: Force iframes to size to content.\n * Requires: iframeResizer.contentWindow.js to be loaded into the target frame.\n * Author: David J. Bradshaw - dave@bradshaw.net\n * Contributor: Jure Mav - jure.mav@gmail.com\n */\n;(function() {\n    'use strict';\n\n\tvar\n\t\tcount                 = 0,\n\t\tfirstRun              = true,\n\t\tmsgHeader             = 'message',\n\t\tmsgHeaderLen          = msgHeader.length,\n\t\tmsgId                 = '[iFrameSizer]', //Must match iframe msg ID\n\t\tmsgIdLen              = msgId.length,\n\t\tpage                  =  '', //:'+location.href, //Uncoment to debug nested iFrames\n\t\tpagePosition          = null,\n\t\trequestAnimationFrame = window.requestAnimationFrame,\n\t\tresetRequiredMethods  = {max:1,scroll:1,bodyScroll:1,documentElementScroll:1},\n\t\tsettings              = {},\n\n\t\tdefaults              = {\n\t\t\tautoResize                : true,\n\t\t\tbodyBackground            : null,\n\t\t\tbodyMargin                : null,\n\t\t\tbodyMarginV1              : 8,\n\t\t\tbodyPadding               : null,\n\t\t\tcheckOrigin               : true,\n\t\t\tenablePublicMethods       : false,\n\t\t\theightCalculationMethod   : 'offset',\n\t\t\tinterval                  : 32,\n\t\t\tlog                       : false,\n\t\t\tmaxHeight                 : Infinity,\n\t\t\tmaxWidth                  : Infinity,\n\t\t\tminHeight                 : 0,\n\t\t\tminWidth                  : 0,\n\t\t\tscrolling                 : false,\n\t\t\tsizeHeight                : true,\n\t\t\tsizeWidth                 : false,\n\t\t\ttolerance                 : 0,\n\t\t\tclosedCallback            : function(){},\n\t\t\tinitCallback              : function(){},\n\t\t\tmessageCallback           : function(){},\n\t\t\tresizedCallback           : function(){}\n\t\t};\n\n\tfunction addEventListener(obj,evt,func){\n\t\tif ('addEventListener' in window){\n\t\t\tobj.addEventListener(evt,func, false);\n\t\t} else if ('attachEvent' in window){//IE\n\t\t\tobj.attachEvent('on'+evt,func);\n\t\t}\n\t}\n\n\tfunction setupRequestAnimationFrame(){\n\t\tvar\n\t\t\tvendors = ['moz', 'webkit', 'o', 'ms'],\n\t\t\tx;\n\n\t\t// Remove vendor prefixing if prefixed and break early if not\n\t\tfor (x = 0; x < vendors.length && !requestAnimationFrame; x += 1) {\n\t\t\trequestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];\n\t\t}\n\n\t\tif (!(requestAnimationFrame)){\n\t\t\tlog(' RequestAnimationFrame not supported');\n\t\t}\n\t}\n\n\tfunction log(msg){\n\t\tif (settings.log && (typeof console === 'object')){\n\t\t\tconsole.log(msgId + '[Host page'+page+']' + msg);\n\t\t}\n\t}\n\n\n\tfunction iFrameListener(event){\n\t\tfunction resizeIFrame(){\n\t\t\tfunction resize(){\n\t\t\t\tsetSize(messageData);\n\t\t\t\tsetPagePosition();\n\t\t\t\tsettings.resizedCallback(messageData);\n\t\t\t}\n\n\t\t\tensureInRange('Height');\n\t\t\tensureInRange('Width');\n\t\t\t\n\t\t\tsyncResize(resize,messageData,'resetPage');\n\t\t}\n\n\t\tfunction closeIFrame(iframe){\n\t\t\tvar iframeID = iframe.id;\n\n\t\t\tlog(' Removing iFrame: '+iframeID);\n\t\t\tiframe.parentNode.removeChild(iframe);\n\t\t\tsettings.closedCallback(iframeID);\n\t\t\tlog(' --');\n\t\t}\n\n\t\tfunction processMsg(){\n\t\t\tvar data = msg.substr(msgIdLen).split(':');\n\n\t\t\treturn {\n\t\t\t\tiframe: document.getElementById(data[0]),\n\t\t\t\tid:     data[0],\n\t\t\t\theight: data[1],\n\t\t\t\twidth:  data[2],\n\t\t\t\ttype:   data[3]\n\t\t\t};\n\t\t}\n\n\t\tfunction ensureInRange(Dimension){\n\t\t\tvar\n\t\t\t\tmax  = Number(settings['max'+Dimension]),\n\t\t\t\tmin  = Number(settings['min'+Dimension]),\n\t\t\t\tdimension = Dimension.toLowerCase(),\n\t\t\t\tsize = Number(messageData[dimension]);\n\n\t\t\tif (min>max){\n\t\t\t\tthrow new Error('Value for min'+Dimension+' can not be greater than max'+Dimension);\n\t\t\t}\n\n\t\t\tlog(' Checking '+dimension+' is in range '+min+'-'+max);\n\n\t\t\tif (size<min) {\n\t\t\t\tsize=min;\n\t\t\t\tlog(' Set '+dimension+' to min value');\n\t\t\t}\n\n\t\t\tif (size>max) {\n\t\t\t\tsize=max;\n\t\t\t\tlog(' Set '+dimension+' to max value');\n\t\t\t}\n\n\t\t\tmessageData[dimension]=''+size;\n\t\t}\n\n\t\tfunction isMessageFromIFrame(){\n\n\t\t\tvar\n\t\t\t\torigin     = event.origin,\n\t\t\t\tremoteHost = messageData.iframe.src.split('/').slice(0,3).join('/');\n\n\t\t\tif (settings.checkOrigin) {\n\t\t\t\tlog(' Checking connection is from: '+remoteHost);\n\n\t\t\t\tif ((''+origin !== 'null') && (origin !== remoteHost)) {\n\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t'Unexpected message received from: ' + origin +\n\t\t\t\t\t\t' for ' + messageData.iframe.id +\n\t\t\t\t\t\t'. Message was: ' + event.data +\n\t\t\t\t\t\t'. This error can be disabled by adding the checkOrigin: false option.'\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn true;\n\t\t}\n\n\t\tfunction isMessageForUs(){\n\t\t\treturn msgId === ('' + msg).substr(0,msgIdLen); //''+Protects against non-string msg\n\t\t}\n\n\t\tfunction isMessageFromMetaParent(){\n\t\t\t//test if this message is from a parent above us. This is an ugly test, however, updating\n\t\t\t//the message format would break backwards compatibity.\n\t\t\tvar retCode = messageData.type in {'true':1,'false':1};\n\n\t\t\tif (retCode){\n\t\t\t\tlog(' Ignoring init message from meta parent page');\n\t\t\t}\n\n\t\t\treturn retCode;\n\t\t}\n\n\t\tfunction forwardMsgFromIFrame(){\n\t\t\tvar msgBody = msg.substr(msg.indexOf(':')+msgHeaderLen+6); //6 === ':0:0:' + ':' (Ideas to name this magic number most welcome)\n\n\t\t\tlog(' MessageCallback passed: {iframe: '+ messageData.iframe.id + ', message: ' + msgBody + '}');\n\t\t\tsettings.messageCallback({\n\t\t\t\tiframe: messageData.iframe,\n\t\t\t\tmessage: JSON.parse(msgBody)\n\t\t\t});\n\t\t\tlog(' --');\n\t\t}\n\n\t\tfunction checkIFrameExists(){\n\t\t\tif (null === messageData.iframe) {\n\t\t\t\tthrow new Error('iFrame ('+messageData.id+') does not exist on ' + page);\n\t\t\t}\n\t\t\treturn true;\n\t\t}\n\n\t\tfunction getIFramePosition(){\n\t\t\tvar iFramePosition = messageData.iframe.getBoundingClientRect();\n\n\t\t\tgetPagePosition();\n\n\t\t\treturn {\n\t\t\t\tx: Number(iFramePosition.left) + Number(pagePosition.x),\n\t\t\t\ty: Number(iFramePosition.top)  + Number(pagePosition.y)\n\t\t\t};\n\t\t}\n\n\t\tfunction scrollRequestFromChild(addOffset){\n\t\t\tvar offset = addOffset ? getIFramePosition() : {x:0,y:0};\n\n\t\t\tlog(' Reposition requested from iFrame (offset x:'+offset.x+' y:'+offset.y+')');\n\t\t\tpagePosition = {\n\t\t\t\tx: Number(messageData.width) + offset.x,\n\t\t\t\ty: Number(messageData.height) + offset.y\n\t\t\t};\n\t\t\tsetPagePosition();\n\t\t}\n\n\t\tfunction actionMsg(){\n\t\t\tswitch(messageData.type){\n\t\t\t\tcase 'close':\n\t\t\t\t\tcloseIFrame(messageData.iframe);\n\t\t\t\t\tsettings.resizedCallback(messageData); //To be removed.\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'message':\n\t\t\t\t\tforwardMsgFromIFrame();\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'scrollTo':\n\t\t\t\t\tscrollRequestFromChild(false);\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'scrollToOffset':\n\t\t\t\t\tscrollRequestFromChild(true);\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'reset':\n\t\t\t\t\tresetIFrame(messageData);\n\t\t\t\t\tbreak;\n\t\t\t\tcase 'init':\n\t\t\t\t\tresizeIFrame();\n\t\t\t\t\tsettings.initCallback(messageData.iframe);\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tresizeIFrame();\n\t\t\t}\n\t\t}\n\n\t\tvar\n\t\t\tmsg = event.data,\n\t\t\tmessageData = {};\n\n\t\tif (isMessageForUs()){\n\t\t\tlog(' Received: '+msg);\n\t\t\tmessageData = processMsg();\n\n\t\t\tif ( !isMessageFromMetaParent() && checkIFrameExists() && isMessageFromIFrame() ){\n\t\t\t\tactionMsg();\n\t\t\t\tfirstRun = false;\n\t\t\t}\n\t\t}\n\t}\n\n\n\tfunction getPagePosition (){\n\t\tif(null === pagePosition){\n\t\t\tpagePosition = {\n\t\t\t\tx: (window.pageXOffset !== undefined) ? window.pageXOffset : document.documentElement.scrollLeft,\n\t\t\t\ty: (window.pageYOffset !== undefined) ? window.pageYOffset : document.documentElement.scrollTop\n\t\t\t};\n\t\t\tlog(' Get position: '+pagePosition.x+','+pagePosition.y);\n\t\t}\n\t}\n\n\tfunction setPagePosition(){\n\t\tif(null !== pagePosition){\n\t\t\twindow.scrollTo(pagePosition.x,pagePosition.y);\n\t\t\tlog(' Set position: '+pagePosition.x+','+pagePosition.y);\n\t\t\tpagePosition = null;\n\t\t}\n\t}\n\n\tfunction resetIFrame(messageData){\n\t\tfunction reset(){\n\t\t\tsetSize(messageData);\n\t\t\ttrigger('reset','reset',messageData.iframe);\n\t\t}\n\n\t\tlog(' Size reset requested by '+('init'===messageData.type?'host page':'iFrame'));\n\t\tgetPagePosition();\n\t\tsyncResize(reset,messageData,'init');\n\t}\n\n\tfunction setSize(messageData){\n\t\tfunction setDimension(dimension){\n\t\t\tmessageData.iframe.style[dimension] = messageData[dimension] + 'px';\n\t\t\tlog(\n\t\t\t\t' IFrame (' + messageData.iframe.id +\n\t\t\t\t') ' + dimension +\n\t\t\t\t' set to ' + messageData[dimension] + 'px'\n\t\t\t);\n\t\t}\n\n\t\tif( settings.sizeHeight) { setDimension('height'); }\n\t\tif( settings.sizeWidth ) { setDimension('width'); }\n\t}\n\n\tfunction syncResize(func,messageData,doNotSync){\n\t\tif(doNotSync!==messageData.type && requestAnimationFrame){\n\t\t\tlog(' Requesting animation frame');\n\t\t\trequestAnimationFrame(func);\n\t\t} else {\n\t\t\tfunc();\n\t\t}\n\t}\n\n\tfunction trigger(calleeMsg,msg,iframe){\n\t\tlog('[' + calleeMsg + '] Sending msg to iframe ('+msg+')');\n\t\tiframe.contentWindow.postMessage( msgId + msg, '*' );\n\t}\n\n\n\tfunction setupIFrame(){\n\t\tfunction setLimits(){\n\t\t\tfunction addStyle(style){\n\t\t\t\tif ((Infinity !== settings[style]) && (0 !== settings[style])){\n\t\t\t\t\tiframe.style[style] = settings[style] + 'px';\n\t\t\t\t\tlog(' Set '+style+' = '+settings[style]+'px');\n\t\t\t\t}\n\t\t\t}\n\n\t\t\taddStyle('maxHeight');\n\t\t\taddStyle('minHeight');\n\t\t\taddStyle('maxWidth');\n\t\t\taddStyle('minWidth');\n\t\t}\n\n\t\tfunction ensureHasId(iframeID){\n\t\t\tif (''===iframeID){\n\t\t\t\tiframe.id = iframeID = 'iFrameResizer' + count++;\n\t\t\t\tlog(' Added missing iframe ID: '+ iframeID +' (' + iframe.src + ')');\n\t\t\t}\n\n\t\t\treturn iframeID;\n\t\t}\n\n\t\tfunction setScrolling(){\n\t\t\tlog(' IFrame scrolling ' + (settings.scrolling ? 'enabled' : 'disabled') + ' for ' + iframeID);\n\t\t\tiframe.style.overflow = false === settings.scrolling ? 'hidden' : 'auto';\n\t\t\tiframe.scrolling      = false === settings.scrolling ? 'no' : 'yes';\n\t\t}\n\n\t\t//The V1 iFrame script expects an int, where as in V2 expects a CSS\n\t\t//string value such as '1px 3em', so if we have an int for V2, set V1=V2\n\t\t//and then convert V2 to a string PX value.\n\t\tfunction setupBodyMarginValues(){\n\t\t\tif (('number'===typeof(settings.bodyMargin)) || ('0'===settings.bodyMargin)){\n\t\t\t\tsettings.bodyMarginV1 = settings.bodyMargin;\n\t\t\t\tsettings.bodyMargin   = '' + settings.bodyMargin + 'px';\n\t\t\t}\n\t\t}\n\n\t\tfunction createOutgoingMsg(){\n\t\t\treturn iframeID +\n\t\t\t\t':' + settings.bodyMarginV1 +\n\t\t\t\t':' + settings.sizeWidth +\n\t\t\t\t':' + settings.log +\n\t\t\t\t':' + settings.interval +\n\t\t\t\t':' + settings.enablePublicMethods +\n\t\t\t\t':' + settings.autoResize +\n\t\t\t\t':' + settings.bodyMargin +\n\t\t\t\t':' + settings.heightCalculationMethod +\n\t\t\t\t':' + settings.bodyBackground +\n\t\t\t\t':' + settings.bodyPadding +\n\t\t\t\t':' + settings.tolerance;\n\t\t}\n\n\t\tfunction init(msg){\n\t\t\t//We have to call trigger twice, as we can not be sure if all\n\t\t\t//iframes have completed loading when this code runs. The\n\t\t\t//event listener also catches the page changing in the iFrame.\n\t\t\taddEventListener(iframe,'load',function(){\n\t\t\t\tvar fr = firstRun;   // Reduce scope of var to function, because IE8's JS execution\n                                     // context stack is borked and this value gets externally\n                                     // changed midway through running this function.\n\t\t\t\ttrigger('iFrame.onload',msg,iframe);\n\t\t\t\tif (!fr && settings.heightCalculationMethod in resetRequiredMethods){\n\t\t\t\t\tresetIFrame({\n\t\t\t\t\t\tiframe:iframe,\n\t\t\t\t\t\theight:0,\n\t\t\t\t\t\twidth:0,\n\t\t\t\t\t\ttype:'init'\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t});\n\t\t\ttrigger('init',msg,iframe);\n\t\t}\n\n\t\tvar\n            /*jshint validthis:true */\n\t\t\tiframe   = this,\n\t\t\tiframeID = ensureHasId(iframe.id);\n\n\t\tsetScrolling();\n\t\tsetLimits();\n\t\tsetupBodyMarginValues();\n\t\tinit(createOutgoingMsg());\n\t}\n\n\tfunction checkOptions(options){\n\t\tif ('object' !== typeof options){\n\t\t\tthrow new TypeError('Options is not an object.');\n\t\t}\n\t}\n\n\tfunction createNativePublicFunction(){\n\t\tfunction init(element){\n\t\t\tif('IFRAME' !== element.tagName.toUpperCase()) {\n\t\t\t\tthrow new TypeError('Expected <IFRAME> tag, found <'+element.tagName+'>.');\n\t\t\t} else {\n\t\t\t\tsetupIFrame.call(element);\n\t\t\t}\n\t\t}\n\n\t\tfunction processOptions(options){\n\t\t\toptions = options || {};\n\t\t\tcheckOptions(options);\n\n\t\t\tfor (var option in defaults) {\n\t\t\t\tif (defaults.hasOwnProperty(option)){\n\t\t\t\t\tsettings[option] = options.hasOwnProperty(option) ? options[option] : defaults[option];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn function iFrameResizeF(options,selecter){\n\t\t\tprocessOptions(options);\n\t\t\tArray.prototype.forEach.call( document.querySelectorAll( selecter || 'iframe' ), init );\n\t\t};\n\t}\n\n\tfunction createJQueryPublicMethod($){\n\t\t$.fn.iFrameResize = function $iFrameResizeF(options) {\n\t\t\toptions = options || {};\n\t\t\tcheckOptions(options);\n\t\t\tsettings = $.extend( {}, defaults, options );\n\t\t\treturn this.filter('iframe').each( setupIFrame ).end();\n\t\t};\n\t}\n\n\tsetupRequestAnimationFrame();\n\taddEventListener(window,'message',iFrameListener);\n\n\tif (window.jQuery) { createJQueryPublicMethod(jQuery); }\n\n\tif (typeof define === 'function' && define.amd) {\n\t\tdefine([],createNativePublicFunction);\n\t} else if (typeof exports === 'object') { //Node for browserfy\n\t\tmodule.exports = createNativePublicFunction();\n\t} else {\n\t\twindow.iFrameResize = createNativePublicFunction();\n\t}\n\n})();\n"]}