Using windowpageLoad in .NET

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Listing 416 Using windowpageLoad
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<html> <head runat="server"> <title>Forward References</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <script type="text/javascript"> MyReferencedComponent = function() { }; MyReferencedComponentregisterClass ("MyReferencedComponent", SysComponent); MyOtherComponent = function() { this_referencedComponent = null; };
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4: SysApplication
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Listing 416 continued
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MyOtherComponentprototype = { get_referencedComponent: function() { return this_referencedComponent; }, set_referencedComponent: function(value) { this_referencedComponent = value; } }; MyOtherComponentregisterClass ("MyOtherComponent", SysComponent); SysApplicationadd_init( function() { $create( MyOtherComponent, {id:"MyOtherComponent"}, null, {referencedComponent: "MyReferencedComponent" }, null ) } ); SysApplicationadd_init( function() { $create( MyReferencedComponent, {id:"MyReferencedComponent"}, null, null, null ) } ); function pageLoad(sender, args) { var createdComponents = argsget_components(); if (createdComponents !== null) { for (var i=0; i<createdComponentslength; i++) { alert ( "Component #" + (i+1) + ": " + createdComponents[i]get_id() ); } } }
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The Unload Routine
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</script> </form> </body> </html>
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Frankly, we don t think that you should ever use it and that you should attach to the load event instead It might be good for an initial test of what the load event arguments look like, but it becomes pointless in a real application s architecture Finally, when the load event is done executing, the _initializing ag is set back to false, and the initialization routine concludes
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The Unload Routine
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The nal piece of functionality that SysApplication provides is an unload routine triggered when the window s unload event is raised As it turns out, the SysApplicationdispose method contains all the code that is executes in the unload routine
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SysApplicationdispose
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SysApplicationdispose is responsible for ensuring that everything is
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cleaned up as the page is destroyed Because you might want to write code that gets triggered when the page is disposing, the dispose method provides two ways of executing custom code First, like the global windowpageLoad method that is called during initialization if it is present, dispose calls the global windowpageUnload method if it s found If we implement the method as shown in Listing 417, we can write code that gets executed when dispose starts
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Listing 417 windowpageUnload
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windowpageUnload = function(sender, args) { alert ("SysApplication is being destroyed!"); }
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However, rather than use the global pageUnload method, if you want to be noti ed of when SysApplication is unloading, you should add an event handler to the SysApplicationunload event This event is raised
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4: SysApplication
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from within the dispose method right after the pageUnload method is executed An example of wiring up to the unload event is shown in Listing 418
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Listing 418 Wiring to the unload Event
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function unloadHandler(sender, args) { alert ("SysApplication is being destroyed!"); } SysApplicationadd_unload(unloadHandler);
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Common uses of registering your own code for the dispose method are if you have noncomponent objects that need to be destroyed or global timers that need to be stopped Besides providing the unload event, dispose calls dispose on all disposable objects Disposable objects are normally components, but they can be any object that implements the SysIDisposable interface, which guarantees the object has a dispose method to call We can manually add and remove from the list of disposable objects through two methods attached to SysApplication: registerDisposable Object and unregisterDisposableObject
registerDisposableObject registerDisposableObject takes one parameter, the disposable object to
add Listing 419 shows a call to the registerDisposableObject method
Listing 419 Registering a Disposable Object
MyObject = function() {}; MyObjectprototype = { dispose: function() { alert ("My Object was disposed"); } }; MyObjectregisterClass("MyObject", null, SysIDisposable); var myObject = new MyObject(); SysApplicationregisterDisposableObject(myObject);
The Unload Routine
NOTE
Checking for SysIDisposable
The registerDisposableObject and unregisterDisposableObject methods expect a parameter that implements SysIDisposable
Now, with myObject registered as a disposable object, dispose will automatically be executed on our myObject instance
unregisterDisposableObject
Just as we add to the list of disposable objects, we can remove from the list using the unregisterDisposableObject method Listing 420 shows a call to the unregisterDisposableObject method
Listing 420 Unregistering a Disposable Object
MyObject = function() {}; MyObjectprototype = { dispose: function() { alert ("My Object was disposed"); } }; MyObjectregisterClass("MyObject", null, SysIDisposable); var myObject = new MyObject(); SysApplicationregisterDisposableObject(myObject); // unregister myObject SysApplicationunRegisterDisposableObject(myObject);
For the most part, you probably won t manually add or remove disposable objects from the list of disposable objects Instead, you will automatically add to this list whenever you create an instance of a new component, because adding to the list of disposable objects is built in to Sys Component s constructor SysComponent s constructor is shown in Listing 421, and the highlighted code is the call to register the component as a disposable object