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(function ($, undef) {

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var global = this;

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// Namespace.

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global.FS = global.FS || {};

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global.FS.PostMessage = function ()

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{

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var

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_is_child = false,

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_postman = new NoJQueryPostMessageMixin('postMessage', 'receiveMessage'),

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_callbacks = {},

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_base_url,

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_parent_url = decodeURIComponent(document.location.hash.replace(/^#/, '')),

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_parent_subdomain = _parent_url.substring(0, _parent_url.indexOf('/', ('https://' === _parent_url.substring(0, ('https://').length)) ? 8 : 7)),

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_init = function () {

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_postman.receiveMessage(function (e) {

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var data = JSON.parse(e.data);

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if (_callbacks[data.type]) {

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for (var i = 0; i < _callbacks[data.type].length; i++) {

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// Execute type callbacks.

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_callbacks[data.type][i](data.data);

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}

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}

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}, _base_url);

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_hasParent = ('' !== _parent_url),

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$window = $(window),

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$html = $('html');

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return {

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init : function (url, iframes)

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{

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_base_url = url;

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_init();

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// Automatically receive forward messages.

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FS.PostMessage.receiveOnce('forward', function (data){

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window.location = data.url;

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});

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iframes = iframes || [];

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if (iframes.length > 0) {

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$window.on('scroll', function () {

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for (var i = 0; i < iframes.length; i++) {

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FS.PostMessage.postScroll(iframes[i]);

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}

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});

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}

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init_child : function ()

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{

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this.init(_parent_subdomain);

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_is_child = true;

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// Post height of a child right after window is loaded.

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$(window).bind('load', function () {

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FS.PostMessage.postHeight();

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// Post message that window was loaded.

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FS.PostMessage.post('loaded');

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});

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hasParent : function ()

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{

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return _hasParent;

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postHeight : function (diff, wrapper) {

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diff = diff || 0;

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wrapper = wrapper || '#wrap_section';

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this.post('height', {

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height: diff + $(wrapper).outerHeight(true)

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});

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postScroll : function (iframe) {

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this.post('scroll', {

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top: $window.scrollTop(),

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height: ($window.height() - parseFloat($html.css('paddingTop')) - parseFloat($html.css('marginTop')))

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}, iframe);

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post : function (type, data, iframe)

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{

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console.debug('PostMessage.post', type);

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if (iframe)

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{

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// Post to iframe.

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_postman.postMessage(JSON.stringify({

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type: type,

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data: data

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}), iframe.src, iframe.contentWindow);

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}

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else {

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// Post to parent.

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_postman.postMessage(JSON.stringify({

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type: type,

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data: data

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}), _parent_url, window.parent);

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}

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receive: function (type, callback)

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{

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console.debug('PostMessage.receive', type);

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if (undef === _callbacks[type])

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_callbacks[type] = [];

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_callbacks[type].push(callback);

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receiveOnce: function (type, callback)

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{

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if (this.is_set(type))

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return;

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this.receive(type, callback);

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// Check if any callbacks assigned to a specified message type.

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is_set: function (type)

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{

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return (undef != _callbacks[type]);

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parent_url: function ()

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{

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return _parent_url;

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parent_subdomain: function ()

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{

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return _parent_subdomain;

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}

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};

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}();

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})(jQuery);

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