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dom.js
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dom.js
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/*
* ***** BEGIN LICENSE BLOCK *****
* Copyright (c) 2011-2012 VMware, Inc.
*
* For the license see COPYING.
* ***** END LICENSE BLOCK *****
*/
// May be used by htmlfile jsonp and transports.
var MPrefix = '_sockjs_global';
utils.createHook = function() {
var window_id = 'a' + utils.random_string(8);
if (!(MPrefix in _window)) {
var map = {};
_window[MPrefix] = function(window_id) {
if (!(window_id in map)) {
map[window_id] = {
id: window_id,
del: function() {delete map[window_id];}
};
}
return map[window_id];
}
}
return _window[MPrefix](window_id);
};
utils.attachMessage = function(listener) {
utils.attachEvent('message', listener);
};
utils.attachEvent = function(event, listener) {
if (typeof _window.addEventListener !== 'undefined') {
_window.addEventListener(event, listener, false);
} else {
// IE quirks.
// According to: http://stevesouders.com/misc/test-postmessage.php
// the message gets delivered only to 'document', not 'window'.
_document.attachEvent("on" + event, listener);
// I get 'window' for ie8.
_window.attachEvent("on" + event, listener);
}
};
utils.detachMessage = function(listener) {
utils.detachEvent('message', listener);
};
utils.detachEvent = function(event, listener) {
if (typeof _window.addEventListener !== 'undefined') {
_window.removeEventListener(event, listener, false);
} else {
_document.detachEvent("on" + event, listener);
_window.detachEvent("on" + event, listener);
}
};
var on_unload = {};
// Things registered after beforeunload are to be called immediately.
var after_unload = false;
var trigger_unload_callbacks = function() {
for(var ref in on_unload) {
on_unload[ref]();
delete on_unload[ref];
};
};
var unload_triggered = function() {
if(after_unload) return;
after_unload = true;
trigger_unload_callbacks();
};
// Onbeforeunload alone is not reliable. We could use only 'unload'
// but it's not working in opera within an iframe. Let's use both.
utils.attachEvent('beforeunload', unload_triggered);
utils.attachEvent('unload', unload_triggered);
utils.unload_add = function(listener) {
var ref = utils.random_string(8);
on_unload[ref] = listener;
if (after_unload) {
utils.delay(trigger_unload_callbacks);
}
return ref;
};
utils.unload_del = function(ref) {
if (ref in on_unload)
delete on_unload[ref];
};
utils.createIframe = function (iframe_url, error_callback) {
var iframe = _document.createElement('iframe');
var tref, unload_ref;
var unattach = function() {
clearTimeout(tref);
// Explorer had problems with that.
try {iframe.onload = null;} catch (x) {}
iframe.onerror = null;
};
var cleanup = function() {
if (iframe) {
unattach();
// This timeout makes chrome fire onbeforeunload event
// within iframe. Without the timeout it goes straight to
// onunload.
setTimeout(function() {
if(iframe) {
iframe.parentNode.removeChild(iframe);
}
iframe = null;
}, 0);
utils.unload_del(unload_ref);
}
};
var onerror = function(r) {
if (iframe) {
cleanup();
error_callback(r);
}
};
var post = function(msg, origin) {
try {
// When the iframe is not loaded, IE raises an exception
// on 'contentWindow'.
if (iframe && iframe.contentWindow) {
iframe.contentWindow.postMessage(msg, origin);
}
} catch (x) {};
};
iframe.src = iframe_url;
iframe.style.display = 'none';
iframe.style.position = 'absolute';
iframe.onerror = function(){onerror('onerror');};
iframe.onload = function() {
// `onload` is triggered before scripts on the iframe are
// executed. Give it few seconds to actually load stuff.
clearTimeout(tref);
tref = setTimeout(function(){onerror('onload timeout');}, 2000);
};
_document.body.appendChild(iframe);
tref = setTimeout(function(){onerror('timeout');}, 5000);
unload_ref = utils.unload_add(cleanup);
return {
post: post,
cleanup: cleanup,
loaded: unattach
};
};
utils.createHtmlfile = function (iframe_url, error_callback) {
var doc = new ActiveXObject('htmlfile');
var tref, unload_ref;
var iframe;
var unattach = function() {
clearTimeout(tref);
};
var cleanup = function() {
if (doc) {
unattach();
utils.unload_del(unload_ref);
iframe.parentNode.removeChild(iframe);
iframe = doc = null;
CollectGarbage();
}
};
var onerror = function(r) {
if (doc) {
cleanup();
error_callback(r);
}
};
var post = function(msg, origin) {
try {
// When the iframe is not loaded, IE raises an exception
// on 'contentWindow'.
if (iframe && iframe.contentWindow) {
iframe.contentWindow.postMessage(msg, origin);
}
} catch (x) {};
};
doc.open();
doc.write('<html><s' + 'cript>' +
'document.domain="' + document.domain + '";' +
'</s' + 'cript></html>');
doc.close();
doc.parentWindow[WPrefix] = _window[WPrefix];
var c = doc.createElement('div');
doc.body.appendChild(c);
iframe = doc.createElement('iframe');
c.appendChild(iframe);
iframe.src = iframe_url;
tref = setTimeout(function(){onerror('timeout');}, 5000);
unload_ref = utils.unload_add(cleanup);
return {
post: post,
cleanup: cleanup,
loaded: unattach
};
};