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/*
* File: iframeResizer.js
* Desc: Force iframes to size to content.
* Requires: iframeResizer.contentWindow.js to be loaded into the target frame.
* Author: David J. Bradshaw - dave@bradshaw.net
* Contributor: Jure Mav - jure.mav@gmail.com
* Contributor: Reed Dadoune - reed@dadoune.com
*/
;(function() {
'use strict';
var
count = 0,
firstRun = true,
logEnabled = false,
msgHeader = 'message',
msgHeaderLen = msgHeader.length,
msgId = '[iFrameSizer]', //Must match iframe msg ID
msgIdLen = msgId.length,
pagePosition = null,
requestAnimationFrame = window.requestAnimationFrame,
resetRequiredMethods = {max:1,scroll:1,bodyScroll:1,documentElementScroll:1},
settings = {},
timer = null,
defaults = {
autoResize : true,
bodyBackground : null,
bodyMargin : null,
bodyMarginV1 : 8,
bodyPadding : null,
checkOrigin : true,
enableInPageLinks : false,
enablePublicMethods : false,
heightCalculationMethod : 'offset',
interval : 32,
log : false,
maxHeight : Infinity,
maxWidth : Infinity,
minHeight : 0,
minWidth : 0,
resizeFrom : 'parent',
scrolling : false,
sizeHeight : true,
sizeWidth : false,
tolerance : 0,
closedCallback : function(){},
initCallback : function(){},
messageCallback : function(){},
resizedCallback : function(){},
scrollCallback : function(){return true;}
};
function addEventListener(obj,evt,func){
if ('addEventListener' in window){
obj.addEventListener(evt,func, false);
} else if ('attachEvent' in window){//IE
obj.attachEvent('on'+evt,func);
}
}
function setupRequestAnimationFrame(){
var
vendors = ['moz', 'webkit', 'o', 'ms'],
x;
// Remove vendor prefixing if prefixed and break early if not
for (x = 0; x < vendors.length && !requestAnimationFrame; x += 1) {
requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
}
if (!(requestAnimationFrame)){
log(' RequestAnimationFrame not supported');
}
}
function getMyID(){
var retStr = 'Host page';
if (window.top!==window.self){
if (window.parentIFrame){
retStr = window.parentIFrame.getId();
} else {
retStr = 'Nested host page';
}
}
return retStr;
}
function formatLogMsg(msg){
return msgId + '[' + getMyID() + ']' + msg;
}
function log(msg){
if (logEnabled && ('object' === typeof window.console)){
console.log(formatLogMsg(msg));
}
}
function warn(msg){
if ('object' === typeof window.console){
console.warn(formatLogMsg(msg));
}
}
function iFrameListener(event){
function resizeIFrame(){
function resize(){
setSize(messageData);
setPagePosition();
settings[iframeID].resizedCallback(messageData);
}
ensureInRange('Height');
ensureInRange('Width');
syncResize(resize,messageData,'resetPage');
}
function closeIFrame(iframe){
var iframeID = iframe.id;
log(' Removing iFrame: '+iframeID);
iframe.parentNode.removeChild(iframe);
settings[iframeID].closedCallback(iframeID);
delete settings[iframeID];
log(' --');
}
function processMsg(){
var data = msg.substr(msgIdLen).split(':');
return {
iframe: document.getElementById(data[0]),
id: data[0],
height: data[1],
width: data[2],
type: data[3]
};
}
function ensureInRange(Dimension){
var
max = Number(settings[iframeID]['max'+Dimension]),
min = Number(settings[iframeID]['min'+Dimension]),
dimension = Dimension.toLowerCase(),
size = Number(messageData[dimension]);
if (min>max){
throw new Error('Value for min'+Dimension+' can not be greater than max'+Dimension);
}
log(' Checking '+dimension+' is in range '+min+'-'+max);
if (size<min) {
size=min;
log(' Set '+dimension+' to min value');
}
if (size>max) {
size=max;
log(' Set '+dimension+' to max value');
}
messageData[dimension]=''+size;
}
function isMessageFromIFrame(){
function checkAllowedOrigin(){
function checkList(){
log(' Checking connection is from allowed list of origins: ' + checkOrigin);
var i;
for (i = 0; i < checkOrigin.length; i++) {
if (checkOrigin[i] === origin) {
return true;
}
}
return false;
}
function checkSingle(){
log(' Checking connection is from: '+remoteHost);
return origin == remoteHost;
}
return checkOrigin.constructor === Array ? checkList() : checkSingle();
}
var
origin = event.origin,
checkOrigin = settings[iframeID].checkOrigin,
remoteHost = messageData.iframe.src.split('/').slice(0,3).join('/');
if (checkOrigin) {
if ((''+origin !== 'null') && !checkAllowedOrigin()) {
throw new Error(
'Unexpected message received from: ' + origin +
' for ' + messageData.iframe.id +
'. Message was: ' + event.data +
'. This error can be disabled by setting the checkOrigin: false option or by providing of array of trusted domains.'
);
}
}
return true;
}
function isMessageForUs(){
return msgId === ('' + msg).substr(0,msgIdLen); //''+Protects against non-string msg
}
function isMessageFromMetaParent(){
//test if this message is from a parent above us. This is an ugly test, however, updating
//the message format would break backwards compatibity.
var retCode = messageData.type in {'true':1,'false':1,'undefined':1};
if (retCode){
log(' Ignoring init message from meta parent page');
}
return retCode;
}
function getMsgBody(offset){
return msg.substr(msg.indexOf(':')+msgHeaderLen+offset);
}
function forwardMsgFromIFrame(msgBody){
log(' MessageCallback passed: {iframe: '+ messageData.iframe.id + ', message: ' + msgBody + '}');
settings[iframeID].messageCallback({
iframe: messageData.iframe,
message: JSON.parse(msgBody)
});
log(' --');
}
function checkIFrameExists(){
if (null === messageData.iframe) {
warn(' IFrame ('+messageData.id+') not found');
return false;
}
return true;
}
function getElementPosition(target){
var
iFramePosition = target.getBoundingClientRect();
getPagePosition();
return {
x: parseInt(iFramePosition.left, 10) + parseInt(pagePosition.x, 10),
y: parseInt(iFramePosition.top, 10) + parseInt(pagePosition.y, 10)
};
}
function scrollRequestFromChild(addOffset){
function reposition(){
pagePosition = newPosition;
scrollTo();
log(' --');
}
function calcOffset(){
return {
x: Number(messageData.width) + offset.x,
y: Number(messageData.height) + offset.y
};
}
var
offset = addOffset ? getElementPosition(messageData.iframe) : {x:0,y:0},
newPosition = calcOffset();
log(' Reposition requested from iFrame (offset x:'+offset.x+' y:'+offset.y+')');
if(window.top!==window.self){
if (window.parentIFrame){
if (addOffset){
parentIFrame.scrollToOffset(newPosition.x,newPosition.y);
} else {
parentIFrame.scrollTo(messageData.width,messageData.height);
}
} else {
warn(' Unable to scroll to requested position, window.parentIFrame not found');
}
} else {
reposition();
}
}
function scrollTo(){
if (false !== settings[iframeID].scrollCallback(pagePosition)){
setPagePosition();
}
}
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);
pagePosition = {
x: jumpPosition.x,
y: jumpPosition.y
};
scrollTo();
log(' --');
}
var target = document.getElementById(hashData) || document.getElementsByName(hashData)[0];
if(window.top!==window.self){
if (window.parentIFrame){
parentIFrame.moveToAnchor(hash);
} else {
log(' In page link #'+hash+' not found and window.parentIFrame not found');
}
} else if (target){
jumpToTarget(target);
} else {
log(' In page link #'+hash+' not found');
}
}
function actionMsg(){
switch(messageData.type){
case 'close':
closeIFrame(messageData.iframe);
break;
case 'message':
forwardMsgFromIFrame(getMsgBody(6));
break;
case 'scrollTo':
scrollRequestFromChild(false);
break;
case 'scrollToOffset':
scrollRequestFromChild(true);
break;
case 'inPageLink':
findTarget(getMsgBody(9));
break;
case 'reset':
resetIFrame(messageData);
break;
case 'init':
resizeIFrame();
settings[iframeID].initCallback(messageData.iframe);
break;
default:
resizeIFrame();
}
}
function hasSettings(iframeID){
var retBool = true;
if (!settings[iframeID]){
retBool = false;
warn(messageData.type + ' No settings for ' + iframeID + '. Message was: ' + msg);
}
return retBool;
}
var
msg = event.data,
messageData = {},
iframeID = null;
if (isMessageForUs()){
messageData = processMsg();
iframeID = messageData.id;
if (!isMessageFromMetaParent() && hasSettings(iframeID)){
logEnabled = settings[iframeID].log;
log(' Received: '+msg);
if ( checkIFrameExists() && isMessageFromIFrame() ){
actionMsg();
firstRun = false;
}
}
}
}
function getPagePosition (){
if(null === pagePosition){
pagePosition = {
x: (window.pageXOffset !== undefined) ? window.pageXOffset : document.documentElement.scrollLeft,
y: (window.pageYOffset !== undefined) ? window.pageYOffset : document.documentElement.scrollTop
};
log(' Get page position: '+pagePosition.x+','+pagePosition.y);
}
}
function setPagePosition(){
if(null !== pagePosition){
window.scrollTo(pagePosition.x,pagePosition.y);
log(' Set page position: '+pagePosition.x+','+pagePosition.y);
pagePosition = null;
}
}
function resetIFrame(messageData){
function reset(){
setSize(messageData);
trigger('reset','reset',messageData.iframe,messageData.id);
}
log(' Size reset requested by '+('init'===messageData.type?'host page':'iFrame'));
getPagePosition();
syncResize(reset,messageData,'init');
}
function setSize(messageData){
function setDimension(dimension){
messageData.iframe.style[dimension] = messageData[dimension] + 'px';
log(
' IFrame (' + iframeID +
') ' + dimension +
' set to ' + messageData[dimension] + 'px'
);
}
var iframeID = messageData.iframe.id;
if( settings[iframeID].sizeHeight) { setDimension('height'); }
if( settings[iframeID].sizeWidth ) { setDimension('width'); }
}
function syncResize(func,messageData,doNotSync){
if(doNotSync!==messageData.type && requestAnimationFrame){
log(' Requesting animation frame');
requestAnimationFrame(func);
} else {
func();
}
}
function trigger(calleeMsg,msg,iframe,id){
if(iframe && iframe.contentWindow){
log('[' + calleeMsg + '] Sending msg to iframe ('+msg+')');
iframe.contentWindow.postMessage( msgId + msg, '*' );
} else {
warn('[' + calleeMsg + '] IFrame not found');
if(settings[id]) delete settings[id];
}
}
function setupIFrame(options){
function setLimits(){
function addStyle(style){
if ((Infinity !== settings[iframeID][style]) && (0 !== settings[iframeID][style])){
iframe.style[style] = settings[iframeID][style] + 'px';
log(' Set '+style+' = '+settings[iframeID][style]+'px');
}
}
addStyle('maxHeight');
addStyle('minHeight');
addStyle('maxWidth');
addStyle('minWidth');
}
function ensureHasId(iframeID){
if (''===iframeID){
iframe.id = iframeID = 'iFrameResizer' + count++;
logEnabled = (options || {}).log;
log(' Added missing iframe ID: '+ iframeID +' (' + iframe.src + ')');
}
return iframeID;
}
function setScrolling(){
log(' IFrame scrolling ' + (settings[iframeID].scrolling ? 'enabled' : 'disabled') + ' for ' + iframeID);
iframe.style.overflow = false === settings[iframeID].scrolling ? 'hidden' : 'auto';
iframe.scrolling = false === settings[iframeID].scrolling ? 'no' : 'yes';
}
//The V1 iFrame script expects an int, where as in V2 expects a CSS
//string value such as '1px 3em', so if we have an int for V2, set V1=V2
//and then convert V2 to a string PX value.
function setupBodyMarginValues(){
if (('number'===typeof(settings[iframeID].bodyMargin)) || ('0'===settings[iframeID].bodyMargin)){
settings[iframeID].bodyMarginV1 = settings[iframeID].bodyMargin;
settings[iframeID].bodyMargin = '' + settings[iframeID].bodyMargin + 'px';
}
}
function createOutgoingMsg(){
return iframeID +
':' + settings[iframeID].bodyMarginV1 +
':' + settings[iframeID].sizeWidth +
':' + settings[iframeID].log +
':' + settings[iframeID].interval +
':' + settings[iframeID].enablePublicMethods +
':' + settings[iframeID].autoResize +
':' + settings[iframeID].bodyMargin +
':' + settings[iframeID].heightCalculationMethod +
':' + settings[iframeID].bodyBackground +
':' + settings[iframeID].bodyPadding +
':' + settings[iframeID].tolerance +
':' + settings[iframeID].enableInPageLinks +
':' + settings[iframeID].resizeFrom;
}
function init(msg){
//We have to call trigger twice, as we can not be sure if all
//iframes have completed loading when this code runs. The
//event listener also catches the page changing in the iFrame.
addEventListener(iframe,'load',function(){
var fr = firstRun; // Reduce scope of var to function, because IE8's JS execution
// context stack is borked and this value gets externally
// changed midway through running this function.
trigger('iFrame.onload',msg,iframe);
if (!fr && settings[iframeID].heightCalculationMethod in resetRequiredMethods){
resetIFrame({
iframe:iframe,
height:0,
width:0,
type:'init'
});
}
});
trigger('init',msg,iframe);
}
function checkOptions(options){
if ('object' !== typeof options){
throw new TypeError('Options is not an object.');
}
}
function processOptions(options){
options = options || {};
settings[iframeID] = {};
checkOptions(options);
for (var option in defaults) {
if (defaults.hasOwnProperty(option)){
settings[iframeID][option] = options.hasOwnProperty(option) ? options[option] : defaults[option];
}
}
logEnabled = settings[iframeID].log;
}
var
/*jshint validthis:true */
iframe = this,
iframeID = ensureHasId(iframe.id);
processOptions(options);
setScrolling();
setLimits();
setupBodyMarginValues();
init(createOutgoingMsg());
}
function throttle(fn,time){
if (null === timer){
timer = setTimeout(function(){
timer = null;
fn();
}, time);
}
}
function winResize(){
throttle(function(){
for (var iframeId in settings){
if('parent' === settings[iframeId].resizeFrom){
trigger('Window resize','resize',document.getElementById(iframeId),iframeId);
}
}
},66);
}
function factory(){
setupRequestAnimationFrame();
addEventListener(window,'message',iFrameListener);
addEventListener(window,'resize', winResize);
function init(element, options){
if(!element.tagName) {
throw new TypeError('Object is not a valid DOM element');
} else if ('IFRAME' !== element.tagName.toUpperCase()) {
throw new TypeError('Expected <IFRAME> tag, found <'+element.tagName+'>.');
} else {
setupIFrame.call(element, options);
}
}
return function iFrameResizeF(options,target){
switch (typeof(target)){
case 'undefined':
case 'string':
Array.prototype.forEach.call( document.querySelectorAll( target || 'iframe' ), function (element) {
init(element, options);
});
break;
case 'object':
init(target, options);
break;
default:
throw new TypeError('Unexpected data type ('+typeof(target)+').');
}
};
}
function createJQueryPublicMethod($){
$.fn.iFrameResize = function $iFrameResizeF(options) {
return this.filter('iframe').each(function (index, element) {
setupIFrame.call(element, options);
}).end();
};
}
if (window.jQuery) { createJQueryPublicMethod(jQuery); }
if (typeof define === 'function' && define.amd) {
define([],factory);
} else if (typeof module === 'object' && typeof module.exports === 'object') { //Node for browserfy
module.exports = factory();
} else {
window.iFrameResize = window.iFrameResize || factory();
}
})();