iframe.js
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'use strict';
var eventUtils = require('./event')
, JSON3 = require('json3')
, browser = require('./browser')
;
var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
debug = require('debug')('sockjs-client:utils:iframe');
}
module.exports = {
WPrefix: '_jp'
, currentWindowId: null
, polluteGlobalNamespace: function() {
if (!(module.exports.WPrefix in global)) {
global[module.exports.WPrefix] = {};
}
}
, postMessage: function(type, data) {
if (global.parent !== global) {
global.parent.postMessage(JSON3.stringify({
windowId: module.exports.currentWindowId
, type: type
, data: data || ''
}), '*');
} else {
debug('Cannot postMessage, no parent window.', type, data);
}
}
, createIframe: function(iframeUrl, errorCallback) {
var iframe = global.document.createElement('iframe');
var tref, unloadRef;
var unattach = function() {
debug('unattach');
clearTimeout(tref);
// Explorer had problems with that.
try {
iframe.onload = null;
} catch (x) {
// intentionally empty
}
iframe.onerror = null;
};
var cleanup = function() {
debug('cleanup');
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);
eventUtils.unloadDel(unloadRef);
}
};
var onerror = function(err) {
debug('onerror', err);
if (iframe) {
cleanup();
errorCallback(err);
}
};
var post = function(msg, origin) {
debug('post', msg, origin);
setTimeout(function() {
try {
// When the iframe is not loaded, IE raises an exception
// on 'contentWindow'.
if (iframe && iframe.contentWindow) {
iframe.contentWindow.postMessage(msg, origin);
}
} catch (x) {
// intentionally empty
}
}, 0);
};
iframe.src = iframeUrl;
iframe.style.display = 'none';
iframe.style.position = 'absolute';
iframe.onerror = function() {
onerror('onerror');
};
iframe.onload = function() {
debug('onload');
// `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);
};
global.document.body.appendChild(iframe);
tref = setTimeout(function() {
onerror('timeout');
}, 15000);
unloadRef = eventUtils.unloadAdd(cleanup);
return {
post: post
, cleanup: cleanup
, loaded: unattach
};
}
/* eslint no-undef: "off", new-cap: "off" */
, createHtmlfile: function(iframeUrl, errorCallback) {
var axo = ['Active'].concat('Object').join('X');
var doc = new global[axo]('htmlfile');
var tref, unloadRef;
var iframe;
var unattach = function() {
clearTimeout(tref);
iframe.onerror = null;
};
var cleanup = function() {
if (doc) {
unattach();
eventUtils.unloadDel(unloadRef);
iframe.parentNode.removeChild(iframe);
iframe = doc = null;
CollectGarbage();
}
};
var onerror = function(r) {
debug('onerror', r);
if (doc) {
cleanup();
errorCallback(r);
}
};
var post = function(msg, origin) {
try {
// When the iframe is not loaded, IE raises an exception
// on 'contentWindow'.
setTimeout(function() {
if (iframe && iframe.contentWindow) {
iframe.contentWindow.postMessage(msg, origin);
}
}, 0);
} catch (x) {
// intentionally empty
}
};
doc.open();
doc.write('<html><s' + 'cript>' +
'document.domain="' + global.document.domain + '";' +
'</s' + 'cript></html>');
doc.close();
doc.parentWindow[module.exports.WPrefix] = global[module.exports.WPrefix];
var c = doc.createElement('div');
doc.body.appendChild(c);
iframe = doc.createElement('iframe');
c.appendChild(iframe);
iframe.src = iframeUrl;
iframe.onerror = function() {
onerror('onerror');
};
tref = setTimeout(function() {
onerror('timeout');
}, 15000);
unloadRef = eventUtils.unloadAdd(cleanup);
return {
post: post
, cleanup: cleanup
, loaded: unattach
};
}
};
module.exports.iframeEnabled = false;
if (global.document) {
// postMessage misbehaves in konqueror 4.6.5 - the messages are delivered with
// huge delay, or not at all.
module.exports.iframeEnabled = (typeof global.postMessage === 'function' ||
typeof global.postMessage === 'object') && (!browser.isKonqueror());
}