'use strict';
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var eventUtils = require('./event')
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, browser = require('./browser')
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;
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var debug = function() {};
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if (process.env.NODE_ENV !== 'production') {
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debug = require('debug')('sockjs-client:utils:iframe');
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}
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module.exports = {
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WPrefix: '_jp'
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, currentWindowId: null
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, polluteGlobalNamespace: function() {
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if (!(module.exports.WPrefix in global)) {
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global[module.exports.WPrefix] = {};
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}
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}
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, postMessage: function(type, data) {
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if (global.parent !== global) {
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global.parent.postMessage(JSON.stringify({
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windowId: module.exports.currentWindowId
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, type: type
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, data: data || ''
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}), '*');
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} else {
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debug('Cannot postMessage, no parent window.', type, data);
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}
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}
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, createIframe: function(iframeUrl, errorCallback) {
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var iframe = global.document.createElement('iframe');
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var tref, unloadRef;
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var unattach = function() {
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debug('unattach');
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clearTimeout(tref);
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// Explorer had problems with that.
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try {
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iframe.onload = null;
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} catch (x) {
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// intentionally empty
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}
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iframe.onerror = null;
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};
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var cleanup = function() {
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debug('cleanup');
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if (iframe) {
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unattach();
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// This timeout makes chrome fire onbeforeunload event
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// within iframe. Without the timeout it goes straight to
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// onunload.
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setTimeout(function() {
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if (iframe) {
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iframe.parentNode.removeChild(iframe);
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}
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iframe = null;
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}, 0);
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eventUtils.unloadDel(unloadRef);
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}
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};
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var onerror = function(err) {
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debug('onerror', err);
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if (iframe) {
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cleanup();
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errorCallback(err);
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}
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};
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var post = function(msg, origin) {
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debug('post', msg, origin);
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setTimeout(function() {
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try {
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// When the iframe is not loaded, IE raises an exception
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// on 'contentWindow'.
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if (iframe && iframe.contentWindow) {
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iframe.contentWindow.postMessage(msg, origin);
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}
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} catch (x) {
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// intentionally empty
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}
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}, 0);
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};
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iframe.src = iframeUrl;
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iframe.style.display = 'none';
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iframe.style.position = 'absolute';
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iframe.onerror = function() {
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onerror('onerror');
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};
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iframe.onload = function() {
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debug('onload');
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// `onload` is triggered before scripts on the iframe are
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// executed. Give it few seconds to actually load stuff.
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clearTimeout(tref);
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tref = setTimeout(function() {
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onerror('onload timeout');
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}, 2000);
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};
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global.document.body.appendChild(iframe);
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tref = setTimeout(function() {
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onerror('timeout');
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}, 15000);
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unloadRef = eventUtils.unloadAdd(cleanup);
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return {
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post: post
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, cleanup: cleanup
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, loaded: unattach
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};
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}
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/* eslint no-undef: "off", new-cap: "off" */
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, createHtmlfile: function(iframeUrl, errorCallback) {
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var axo = ['Active'].concat('Object').join('X');
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var doc = new global[axo]('htmlfile');
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var tref, unloadRef;
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var iframe;
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var unattach = function() {
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clearTimeout(tref);
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iframe.onerror = null;
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};
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var cleanup = function() {
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if (doc) {
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unattach();
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eventUtils.unloadDel(unloadRef);
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iframe.parentNode.removeChild(iframe);
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iframe = doc = null;
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CollectGarbage();
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}
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};
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var onerror = function(r) {
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debug('onerror', r);
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if (doc) {
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cleanup();
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errorCallback(r);
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}
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};
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var post = function(msg, origin) {
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try {
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// When the iframe is not loaded, IE raises an exception
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// on 'contentWindow'.
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setTimeout(function() {
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if (iframe && iframe.contentWindow) {
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iframe.contentWindow.postMessage(msg, origin);
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}
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}, 0);
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} catch (x) {
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// intentionally empty
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}
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};
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doc.open();
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doc.write('<html><s' + 'cript>' +
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'document.domain="' + global.document.domain + '";' +
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'</s' + 'cript></html>');
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doc.close();
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doc.parentWindow[module.exports.WPrefix] = global[module.exports.WPrefix];
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var c = doc.createElement('div');
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doc.body.appendChild(c);
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iframe = doc.createElement('iframe');
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c.appendChild(iframe);
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iframe.src = iframeUrl;
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iframe.onerror = function() {
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onerror('onerror');
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};
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tref = setTimeout(function() {
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onerror('timeout');
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}, 15000);
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unloadRef = eventUtils.unloadAdd(cleanup);
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return {
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post: post
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, cleanup: cleanup
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, loaded: unattach
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};
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}
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};
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module.exports.iframeEnabled = false;
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if (global.document) {
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// postMessage misbehaves in konqueror 4.6.5 - the messages are delivered with
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// huge delay, or not at all.
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module.exports.iframeEnabled = (typeof global.postMessage === 'function' ||
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typeof global.postMessage === 'object') && (!browser.isKonqueror());
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}
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