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83 lines
3.1 KiB
JavaScript
83 lines
3.1 KiB
JavaScript
12 years ago
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define("dojo/_base/unload", ["./kernel", "./lang", "../on"], function(dojo, lang, on){
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// module:
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// dojo/unload
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var win = window;
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var unload = {
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// summary:
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// This module contains the document and window unload detection API.
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addOnWindowUnload: function(/*Object|Function?*/ obj, /*String|Function?*/ functionName){
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// summary:
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// registers a function to be triggered when window.onunload
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// fires.
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// description:
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// The first time that addOnWindowUnload is called Dojo
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// will register a page listener to trigger your unload
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// handler with. Note that registering these handlers may
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// destroy "fastback" page caching in browsers that support
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// it. Be careful trying to modify the DOM or access
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// JavaScript properties during this phase of page unloading:
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// they may not always be available. Consider
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// addOnUnload() if you need to modify the DOM or do
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// heavy JavaScript work since it fires at the equivalent of
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// the page's "onbeforeunload" event.
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// example:
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// | unload.addOnWindowUnload(functionPointer)
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// | unload.addOnWindowUnload(object, "functionName");
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// | unload.addOnWindowUnload(object, function(){ /* ... */});
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if (!dojo.windowUnloaded){
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on(win, "unload", (dojo.windowUnloaded = function(){
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// summary:
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// signal fired by impending window destruction. You may use
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// dojo.addOnWindowUnload() to register a listener for this
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// event. NOTE: if you wish to dojo.connect() to this method
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// to perform page/application cleanup, be aware that this
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// event WILL NOT fire if no handler has been registered with
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// addOnWindowUnload(). This behavior started in Dojo 1.3.
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// Previous versions always triggered windowUnloaded(). See
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// addOnWindowUnload for more info.
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}));
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}
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on(win, "unload", lang.hitch(obj, functionName));
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},
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addOnUnload: function(/*Object?|Function?*/ obj, /*String|Function?*/ functionName){
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// summary:
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// registers a function to be triggered when the page unloads.
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// description:
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// The first time that addOnUnload is called Dojo will
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// register a page listener to trigger your unload handler
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// with.
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//
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// In a browser environment, the functions will be triggered
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// during the window.onbeforeunload event. Be careful of doing
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// too much work in an unload handler. onbeforeunload can be
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// triggered if a link to download a file is clicked, or if
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// the link is a javascript: link. In these cases, the
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// onbeforeunload event fires, but the document is not
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// actually destroyed. So be careful about doing destructive
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// operations in a dojo.addOnUnload callback.
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//
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// Further note that calling dojo.addOnUnload will prevent
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// browsers from using a "fast back" cache to make page
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// loading via back button instantaneous.
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// example:
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// | dojo.addOnUnload(functionPointer)
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// | dojo.addOnUnload(object, "functionName")
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// | dojo.addOnUnload(object, function(){ /* ... */});
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on(win, "beforeunload", lang.hitch(obj, functionName));
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}
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};
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dojo.addOnWindowUnload = unload.addOnWindowUnload;
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dojo.addOnUnload = unload.addOnUnload;
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return unload;
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});
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