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/*
* File: iframeResizer.contentWindow.js
* Desc: Include this file in any page being loaded into an iframe
* to force the iframe to resize to the content size.
* Requires: iframeResizer.js on host page.
* Author: David J. Bradshaw - dave@bradshaw.net
* Contributor: Jure Mav - jure.mav@gmail.com
* Contributor: Ian Caunce - ian@hallnet.co.uk
*/
;(function() {
'use strict';
var
autoResize = true,
base = 10,
bodyBackground = '',
bodyMargin = 0,
bodyMarginStr = '',
bodyPadding = '',
calculateWidth = false,
doubleEventList = {'resize':1,'click':1},
eventCancelTimer = 128,
height = 1,
firstRun = true,
heightCalcModeDefault = 'offset',
heightCalcMode = heightCalcModeDefault,
initLock = true,
initMsg = '',
inPageLinks = {},
interval = 32,
logging = false,
msgID = '[iFrameSizer]', //Must match host page msg ID
msgIdLen = msgID.length,
myID = '',
publicMethods = false,
resetRequiredMethods = {max:1,scroll:1,bodyScroll:1,documentElementScroll:1},
resizeFrom = 'parent',
targetOriginDefault = '*',
target = window.parent,
tolerance = 0,
triggerLocked = false,
triggerLockedTimer = null,
width = 1;
function addEventListener(el,evt,func){
if ('addEventListener' in window){
el.addEventListener(evt,func, false);
} else if ('attachEvent' in window){ //IE
el.attachEvent('on'+evt,func);
}
}
function formatLogMsg(msg){
return msgID + '[' + myID + ']' + ' ' + msg;
}
function log(msg){
if (logging && ('object' === typeof window.console)){
console.log(formatLogMsg(msg));
}
}
function warn(msg){
if ('object' === typeof window.console){
console.warn(formatLogMsg(msg));
}
}
function init(){
log('Initialising iFrame');
readData();
setMargin();
setBodyStyle('background',bodyBackground);
setBodyStyle('padding',bodyPadding);
injectClearFixIntoBodyElement();
checkHeightMode();
stopInfiniteResizingOfIFrame();
setupPublicMethods();
startEventListeners();
inPageLinks = setupInPageLinks();
sendSize('init','Init message from host page');
}
function readData(){
var data = initMsg.substr(msgIdLen).split(':');
function strBool(str){
return 'true' === str ? true : false;
}
myID = data[0];
bodyMargin = (undefined !== data[1]) ? Number(data[1]) : bodyMargin; //For V1 compatibility
calculateWidth = (undefined !== data[2]) ? strBool(data[2]) : calculateWidth;
logging = (undefined !== data[3]) ? strBool(data[3]) : logging;
interval = (undefined !== data[4]) ? Number(data[4]) : interval;
publicMethods = (undefined !== data[5]) ? strBool(data[5]) : publicMethods;
autoResize = (undefined !== data[6]) ? strBool(data[6]) : autoResize;
bodyMarginStr = data[7];
heightCalcMode = (undefined !== data[8]) ? data[8] : heightCalcMode;
bodyBackground = data[9];
bodyPadding = data[10];
tolerance = (undefined !== data[11]) ? Number(data[11]) : tolerance;
inPageLinks.enable = (undefined !== data[12]) ? strBool(data[12]): false;
resizeFrom = data[13];
}
function chkCSS(attr,value){
if (-1 !== value.indexOf('-')){
warn('Negative CSS value ignored for '+attr);
value='';
}
return value;
}
function setBodyStyle(attr,value){
if ((undefined !== value) && ('' !== value) && ('null' !== value)){
document.body.style[attr] = value;
log('Body '+attr+' set to "'+value+'"');
}
}
function setMargin(){
//If called via V1 script, convert bodyMargin from int to str
if (undefined === bodyMarginStr){
bodyMarginStr = bodyMargin+'px';
}
chkCSS('margin',bodyMarginStr);
setBodyStyle('margin',bodyMarginStr);
}
function stopInfiniteResizingOfIFrame(){
document.documentElement.style.height = '';
document.body.style.height = '';
log('HTML & body height set to "auto"');
}
function addTriggerEvent(options){
function addListener(eventName){
addEventListener(window,eventName,function(e){
sendSize(options.eventName,options.eventType);
});
}
if(options.eventNames && Array.prototype.map){
options.eventName = options.eventNames[0];
options.eventNames.map(addListener);
} else {
addListener(options.eventName);
}
log('Added event listener: ' + options.eventType);
}
function initEventListeners(){
addTriggerEvent({ eventType: 'Animation Start', eventNames: ['animationstart','webkitAnimationStart'] });
addTriggerEvent({ eventType: 'Animation Iteration', eventNames: ['animationiteration','webkitAnimationIteration'] });
addTriggerEvent({ eventType: 'Animation End', eventNames: ['animationend','webkitAnimationEnd'] });
addTriggerEvent({ eventType: 'Device Orientation Change', eventName: 'deviceorientation' });
addTriggerEvent({ eventType: 'Transition End', eventNames: ['transitionend','webkitTransitionEnd','MSTransitionEnd','oTransitionEnd','otransitionend'] });
addTriggerEvent({ eventType: 'Window Clicked', eventName: 'click' });
//addTriggerEvent({ eventType: 'Window Mouse Down', eventName: 'mousedown' });
//addTriggerEvent({ eventType: 'Window Mouse Up', eventName: 'mouseup' });
if('child' === resizeFrom){
addTriggerEvent({ eventType: 'IFrame Resized', eventName: 'resize' });
}
}
function checkHeightMode(){
if (heightCalcModeDefault !== heightCalcMode){
if (!(heightCalcMode in getHeight)){
warn(heightCalcMode + ' is not a valid option for heightCalculationMethod.');
heightCalcMode='bodyScroll';
}
log('Height calculation method set to "'+heightCalcMode+'"');
}
}
function startEventListeners(){
if ( true === autoResize ) {
initEventListeners();
setupMutationObserver();
}
else {
log('Auto Resize disabled');
}
}
function injectClearFixIntoBodyElement(){
var clearFix = document.createElement('div');
clearFix.style.clear = 'both';
clearFix.style.display = 'block'; //Guard against this having been globally redefined in CSS.
document.body.appendChild(clearFix);
}
function setupInPageLinks(){
function getPagePosition (){
return {
x: (window.pageXOffset !== undefined) ? window.pageXOffset : document.documentElement.scrollLeft,
y: (window.pageYOffset !== undefined) ? window.pageYOffset : document.documentElement.scrollTop
};
}
function getElementPosition(el){
var
elPosition = el.getBoundingClientRect(),
pagePosition = getPagePosition();
return {
x: parseInt(elPosition.left,10) + parseInt(pagePosition.x,10),
y: parseInt(elPosition.top,10) + parseInt(pagePosition.y,10)
};
}
function findTarget(location){
var hash = location.split("#")[1] || "";
var hashData = decodeURIComponent(hash);
function jumpToTarget(target){
var jumpPosition = getElementPosition(target);
log('Moving to in page link (#'+hash+') at x: '+jumpPosition.x+' y: '+jumpPosition.y);
sendMsg(jumpPosition.y, jumpPosition.x, 'scrollToOffset'); // X&Y reversed at sendMsg uses height/width
}
var target = document.getElementById(hashData) || document.getElementsByName(hashData)[0];
if (target){
jumpToTarget(target);
} else {
log('In page link (#' + hash + ') not found in iFrame, so sending to parent');
sendMsg(0,0,'inPageLink','#'+hash);
}
}
function checkLocationHash(){
if ('' !== location.hash && '#' !== location.hash){
findTarget(location.href);
}
}
function bindAnchors(){
function setupLink(el){
function linkClicked(e){
e.preventDefault();
/*jshint validthis:true */
findTarget(this.getAttribute('href'));
}
if ('#' !== el.getAttribute('href')){
addEventListener(el,'click',linkClicked);
}
}
Array.prototype.forEach.call( document.querySelectorAll( 'a[href^="#"]' ), setupLink );
}
function bindLocationHash(){
addEventListener(window,'hashchange',checkLocationHash);
}
function initCheck(){ //check if page loaded with location hash after init resize
setTimeout(checkLocationHash,eventCancelTimer);
}
function enableInPageLinks(){
if(Array.prototype.forEach && document.querySelectorAll){
log('Setting up location.hash handlers');
bindAnchors();
bindLocationHash();
initCheck();
} else {
warn('In page linking not fully supported in this browser! (See README.md for IE8 workaround)');
}
}
if(inPageLinks.enable){
enableInPageLinks();
} else {
log('In page linking not enabled');
}
return {
findTarget:findTarget
};
}
function setupPublicMethods(){
if (publicMethods) {
log('Enable public methods');
window.parentIFrame = {
close: function closeF(){
sendMsg(0,0,'close');
},
getId: function getIdF(){
return myID;
},
moveToAnchor: function moveToAnchorF(hash){
inPageLinks.findTarget(hash);
},
reset: function resetF(){
resetIFrame('parentIFrame.reset');
},
scrollTo: function scrollToF(x,y){
sendMsg(y,x,'scrollTo'); // X&Y reversed at sendMsg uses height/width
},
scrollToOffset: function scrollToF(x,y){
sendMsg(y,x,'scrollToOffset'); // X&Y reversed at sendMsg uses height/width
},
sendMessage: function sendMessageF(msg,targetOrigin){
sendMsg(0,0,'message',JSON.stringify(msg),targetOrigin);
},
setHeightCalculationMethod: function setHeightCalculationMethodF(heightCalculationMethod){
heightCalcMode = heightCalculationMethod;
checkHeightMode();
},
setTargetOrigin: function setTargetOriginF(targetOrigin){
log('Set targetOrigin: '+targetOrigin);
targetOriginDefault = targetOrigin;
},
size: function sizeF(customHeight, customWidth){
var valString = ''+(customHeight?customHeight:'')+(customWidth?','+customWidth:'');
lockTrigger();
sendSize('size','parentIFrame.size('+valString+')', customHeight, customWidth);
}
};
}
}
function initInterval(){
if ( 0 !== interval ){
log('setInterval: '+interval+'ms');
setInterval(function(){
sendSize('interval','setInterval: '+interval);
},Math.abs(interval));
}
}
function setupInjectElementLoadListners(mutations){
function addLoadListener(element){
if (element.height === undefined || element.width === undefined || 0 === element.height || 0 === element.width){
log('Attach listerner to '+element.src);
addEventListener(element,'load', function imageLoaded(){
sendSize('imageLoad','Image loaded');
});
}
}
mutations.forEach(function (mutation) {
if (mutation.type === 'attributes' && mutation.attributeName === 'src'){
addLoadListener(mutation.target);
} else if (mutation.type === 'childList'){
var images = mutation.target.querySelectorAll('img');
Array.prototype.forEach.call(images,function (image) {
addLoadListener(image);
});
}
});
}
function setupMutationObserver(){
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
function createMutationObserver(){
var
target = document.querySelector('body'),
config = {
attributes : true,
attributeOldValue : false,
characterData : true,
characterDataOldValue : false,
childList : true,
subtree : true
},
observer = new MutationObserver(function(mutations) {
sendSize('mutationObserver','mutationObserver: ' + mutations[0].target + ' ' + mutations[0].type);
setupInjectElementLoadListners(mutations); //Deal with WebKit asyncing image loading when tags are injected into the page
});
log('Enable MutationObserver');
observer.observe(target, config);
}
if (MutationObserver){
if (0 > interval) {
initInterval();
} else {
createMutationObserver();
}
}
else {
warn('MutationObserver not supported in this browser!');
initInterval();
}
}
// document.documentElement.offsetHeight is not reliable, so
// we have to jump through hoops to get a better value.
function getBodyOffsetHeight(){
function getComputedBodyStyle(prop) {
function convertUnitsToPxForIE8(value) {
var PIXEL = /^\d+(px)?$/i;
if (PIXEL.test(value)) {
return parseInt(value,base);
}
var
style = el.style.left,
runtimeStyle = el.runtimeStyle.left;
el.runtimeStyle.left = el.currentStyle.left;
el.style.left = value || 0;
value = el.style.pixelLeft;
el.style.left = style;
el.runtimeStyle.left = runtimeStyle;
return value;
}
var
el = document.body,
retVal = 0;
if (('defaultView' in document) && ('getComputedStyle' in document.defaultView)) {
retVal = document.defaultView.getComputedStyle(el, null);
retVal = (null !== retVal) ? retVal[prop] : 0;
} else {//IE8
retVal = convertUnitsToPxForIE8(el.currentStyle[prop]);
}
return parseInt(retVal,base);
}
return document.body.offsetHeight +
getComputedBodyStyle('marginTop') +
getComputedBodyStyle('marginBottom');
}
function getBodyScrollHeight(){
return document.body.scrollHeight;
}
function getDEOffsetHeight(){
return document.documentElement.offsetHeight;
}
function getDEScrollHeight(){
return document.documentElement.scrollHeight;
}
//From https://github.com/guardian/iframe-messenger
function getLowestElementHeight() {
var
allElements = document.querySelectorAll('body *'),
allElementsLength = allElements.length,
maxBottomVal = 0,
timer = new Date().getTime();
for (var i = 0; i < allElementsLength; i++) {
if (allElements[i].getBoundingClientRect().bottom > maxBottomVal) {
maxBottomVal = allElements[i].getBoundingClientRect().bottom;
}
}
timer = new Date().getTime() - timer;
log('Parsed '+allElementsLength+' HTML elements');
log('LowestElement bottom position calculated in ' + timer + 'ms');
return maxBottomVal;
}
function getAllHeights(){
return [
getBodyOffsetHeight(),
getBodyScrollHeight(),
getDEOffsetHeight(),
getDEScrollHeight()
];
}
function getMaxHeight(){
return Math.max.apply(null,getAllHeights());
}
function getMinHeight(){
return Math.min.apply(null,getAllHeights());
}
function getBestHeight(){
return Math.max(getBodyOffsetHeight(),getLowestElementHeight());
}
var getHeight = {
offset : getBodyOffsetHeight, //Backward compatability
bodyOffset : getBodyOffsetHeight,
bodyScroll : getBodyScrollHeight,
documentElementOffset : getDEOffsetHeight,
scroll : getDEScrollHeight, //Backward compatability
documentElementScroll : getDEScrollHeight,
max : getMaxHeight,
min : getMinHeight,
grow : getMaxHeight,
lowestElement : getBestHeight
};
function getWidth(){
return Math.max(
document.documentElement.scrollWidth,
document.body.scrollWidth
);
}
function sendSize(triggerEvent, triggerEventDesc, customHeight, customWidth){
var currentHeight,currentWidth;
function recordTrigger(){
if (!(triggerEvent in {'reset':1,'resetPage':1,'init':1})){
log( 'Trigger event: ' + triggerEventDesc );
}
}
function resizeIFrame(){
height = currentHeight;
width = currentWidth;
sendMsg(height,width,triggerEvent);
}
function isDoubleFiredEvent(){
return triggerLocked && (triggerEvent in doubleEventList);
}
function isSizeChangeDetected(){
function checkTolarance(a,b){
var retVal = Math.abs(a-b) <= tolerance;
return !retVal;
}
currentHeight = (undefined !== customHeight) ? customHeight : getHeight[heightCalcMode]();
currentWidth = (undefined !== customWidth ) ? customWidth : getWidth();
return checkTolarance(height,currentHeight) ||
(calculateWidth && checkTolarance(width,currentWidth));
}
function isForceResizableEvent(){
return !(triggerEvent in {'init':1,'interval':1,'size':1});
}
function isForceResizableHeightCalcMode(){
return (heightCalcMode in resetRequiredMethods);
}
function logIgnored(){
log('No change in size detected');
}
function checkDownSizing(){
if (isForceResizableEvent() && isForceResizableHeightCalcMode()){
resetIFrame(triggerEventDesc);
} else if (!(triggerEvent in {'interval':1})){
recordTrigger();
logIgnored();
}
}
if (!isDoubleFiredEvent()){
if (isSizeChangeDetected()){
recordTrigger();
lockTrigger();
resizeIFrame();
} else {
checkDownSizing();
}
} else {
log('Trigger event cancelled: '+triggerEvent);
}
}
function lockTrigger(){
if (!triggerLocked){
triggerLocked = true;
log('Trigger event lock on');
}
clearTimeout(triggerLockedTimer);
triggerLockedTimer = setTimeout(function(){
triggerLocked = false;
log('Trigger event lock off');
log('--');
},eventCancelTimer);
}
function triggerReset(triggerEvent){
height = getHeight[heightCalcMode]();
width = getWidth();
sendMsg(height,width,triggerEvent);
}
function resetIFrame(triggerEventDesc){
var hcm = heightCalcMode;
heightCalcMode = heightCalcModeDefault;
log('Reset trigger event: ' + triggerEventDesc);
lockTrigger();
triggerReset('reset');
heightCalcMode = hcm;
}
function sendMsg(height,width,triggerEvent,msg,targetOrigin){
function setTargetOrigin(){
if (undefined === targetOrigin){
targetOrigin = targetOriginDefault;
} else {
log('Message targetOrigin: '+targetOrigin);
}
}
function sendToParent(){
var
size = height + ':' + width,
message = myID + ':' + size + ':' + triggerEvent + (undefined !== msg ? ':' + msg : '');
log('Sending message to host page (' + message + ')');
target.postMessage( msgID + message, targetOrigin);
}
setTargetOrigin();
sendToParent();
}
function receiver(event) {
function isMessageForUs(){
return msgID === (''+event.data).substr(0,msgIdLen); //''+ Protects against non-string messages
}
function initFromParent(){
initMsg = event.data;
target = event.source;
init();
firstRun = false;
setTimeout(function(){ initLock = false;},eventCancelTimer);
}
function resetFromParent(){
if (!initLock){
log('Page size reset by host page');
triggerReset('resetPage');
} else {
log('Page reset ignored by init');
}
}
function resizeFromParent(){
sendSize('resizeParent','Parent window resized');
}
function getMessageType(){
return event.data.split(']')[1];
}
function isMiddleTier(){
return ('iFrameResize' in window);
}
function isInitMsg(){
//test if this message is from a child below us. This is an ugly test, however, updating
//the message format would break backwards compatibity.
return event.data.split(':')[2] in {'true':1,'false':1};
}
if (isMessageForUs()){
if (firstRun === false) {
if ('reset' === getMessageType()){
resetFromParent();
} else if ('resize' === getMessageType()){
resizeFromParent();
} else if (event.data !== initMsg && !isMiddleTier()){
warn('Unexpected message ('+event.data+')');
}
} else if (isInitMsg()) {
initFromParent();
} else {
warn('Received message of type ('+getMessageType()+') before initialization.');
}
}
}
addEventListener(window, 'message', receiver);
})();