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/*!

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* jQuery postMessage - v0.5 - 9/11/2009

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* http://benalman.com/projects/jquery-postmessage-plugin/

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* Dual licensed under the MIT and GPL licenses.

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* http://benalman.com/about/license/

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* Non-jQuery fork by Jeff Lee

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* This fork consists of the following changes:

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* 1. Basic code cleanup and restructuring, for legibility.

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* 2. The `postMessage` and `receiveMessage` functions can be bound arbitrarily,

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* in terms of both function names and object scope. Scope is specified by

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* the the "this" context of NoJQueryPostMessageMixin();

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* 3. I've removed the check for Opera 9.64, which used `$.browser`. There were

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* at least three different GitHub users requesting the removal of this

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* "Opera sniff" on the original project's Issues page, so I figured this

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* would be a relatively safe change.

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* 4. `postMessage` no longer uses `$.param` to serialize messages that are not

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* strings. I actually prefer this structure anyway. `receiveMessage` does

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* not implement a corresponding deserialization step, and as such it seems

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* cleaner and more symmetric to leave both data serialization and

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* deserialization to the client.

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* 5. The use of `$.isFunction` is replaced by a functionally-identical check.

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* 6. The `$:nomunge` YUI option is no longer necessary.

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function NoJQueryPostMessageMixin(postBinding, receiveBinding) {

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var setMessageCallback, unsetMessageCallback, currentMsgCallback,

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intervalId, lastHash, cacheBust = 1;

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if (window.postMessage) {

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if (window.addEventListener) {

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setMessageCallback = function(callback) {

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window.addEventListener('message', callback, false);

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}

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unsetMessageCallback = function(callback) {

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window.removeEventListener('message', callback, false);

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}

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} else {

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setMessageCallback = function(callback) {

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window.attachEvent('onmessage', callback);

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}

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unsetMessageCallback = function(callback) {

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window.detachEvent('onmessage', callback);

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}

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}

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this[postBinding] = function(message, targetUrl, target) {

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if (!targetUrl) {

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return;

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}

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// The browser supports window.postMessage, so call it with a targetOrigin

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// set appropriately, based on the targetUrl parameter.

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target.postMessage( message, targetUrl.replace( /([^:]+:\/\/[^\/]+).*/, '$1' ) );

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}

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// Since the browser supports window.postMessage, the callback will be

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// bound to the actual event associated with window.postMessage.

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this[receiveBinding] = function(callback, sourceOrigin, delay) {

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// Unbind an existing callback if it exists.

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if (currentMsgCallback) {

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unsetMessageCallback(currentMsgCallback);

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currentMsgCallback = null;

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}

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if (!callback) {

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return false;

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}

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// Bind the callback. A reference to the callback is stored for ease of

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// unbinding.

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currentMsgCallback = setMessageCallback(function(e) {

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switch(Object.prototype.toString.call(sourceOrigin)) {

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case '[object String]':

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if (sourceOrigin !== e.origin) {

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return false;

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}

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break;

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case '[object Function]':

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if (sourceOrigin(e.origin)) {

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return false;

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}

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break;

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}

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callback(e);

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});

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};

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} else {

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this[postBinding] = function(message, targetUrl, target) {

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if (!targetUrl) {

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return;

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}

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// The browser does not support window.postMessage, so set the location

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// of the target to targetUrl#message. A bit ugly, but it works! A cache

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// bust parameter is added to ensure that repeat messages trigger the

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// callback.

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target.location = targetUrl.replace( /#.*$/, '' ) + '#' + (+new Date) + (cacheBust++) + '&' + message;

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}

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// Since the browser sucks, a polling loop will be started, and the

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// callback will be called whenever the location.hash changes.

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this[receiveBinding] = function(callback, sourceOrigin, delay) {

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if (intervalId) {

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clearInterval(intervalId);

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intervalId = null;

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}

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if (callback) {

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delay = typeof sourceOrigin === 'number'

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? sourceOrigin

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: typeof delay === 'number'

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? delay

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: 100;

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intervalId = setInterval(function(){

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var hash = document.location.hash,

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re = /^#?\d+&/;

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if ( hash !== lastHash && re.test( hash ) ) {

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lastHash = hash;

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callback({ data: hash.replace( re, '' ) });

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}

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}, delay );

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}

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};

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}

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return this;

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}

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