'use strict';
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var random = require('./random');
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var onUnload = {}
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, afterUnload = false
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// detect google chrome packaged apps because they don't allow the 'unload' event
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, isChromePackagedApp = global.chrome && global.chrome.app && global.chrome.app.runtime
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;
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module.exports = {
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attachEvent: function(event, listener) {
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if (typeof global.addEventListener !== 'undefined') {
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global.addEventListener(event, listener, false);
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} else if (global.document && global.attachEvent) {
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// IE quirks.
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// According to: http://stevesouders.com/misc/test-postmessage.php
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// the message gets delivered only to 'document', not 'window'.
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global.document.attachEvent('on' + event, listener);
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// I get 'window' for ie8.
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global.attachEvent('on' + event, listener);
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}
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}
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, detachEvent: function(event, listener) {
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if (typeof global.addEventListener !== 'undefined') {
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global.removeEventListener(event, listener, false);
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} else if (global.document && global.detachEvent) {
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global.document.detachEvent('on' + event, listener);
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global.detachEvent('on' + event, listener);
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}
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}
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, unloadAdd: function(listener) {
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if (isChromePackagedApp) {
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return null;
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}
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var ref = random.string(8);
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onUnload[ref] = listener;
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if (afterUnload) {
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setTimeout(this.triggerUnloadCallbacks, 0);
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}
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return ref;
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}
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, unloadDel: function(ref) {
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if (ref in onUnload) {
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delete onUnload[ref];
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}
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}
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, triggerUnloadCallbacks: function() {
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for (var ref in onUnload) {
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onUnload[ref]();
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delete onUnload[ref];
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}
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}
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};
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var unloadTriggered = function() {
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if (afterUnload) {
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return;
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}
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afterUnload = true;
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module.exports.triggerUnloadCallbacks();
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};
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// 'unload' alone is not reliable in opera within an iframe, but we
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// can't use `beforeunload` as IE fires it on javascript: links.
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if (!isChromePackagedApp) {
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module.exports.attachEvent('unload', unloadTriggered);
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}
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