Initialization Routine in Visual Studio .NET

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Initialization Routine
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is safe to do so now because all components will be available as references to other components, and the order they were created in no longer matters The endCreateComponents method iterates over the secondPass Components member and calls the global _setReferences method we described in 3 using the object that contains the component and the references it wants to be assigned as the method call s parameters When the _setReferences method completes, endUpdate is called on the component, triggering the component s initialize method Listing 414 demonstrates this idea in action by creating a component that references another component that is created after it However, because they utilize the SysApplication s init event, the reference is assigned successfully
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Listing 414 Setting a Forward Reference
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<html> <head> <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; }; MyOtherComponentprototype = { get_referencedComponent: function() { return this_referencedComponent; }, set_referencedComponent: function(value) { this_referencedComponent = value; } }; MyOtherComponentregisterClass ("MyOtherComponent", SysComponent); SysApplicationadd_init(
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4: SysApplication
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Listing 414 continued
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function() { $create( MyOtherComponent, {id:"MyOtherComponent"}, null, {referencedComponent: "MyReferencedComponent" }, null ) } ); SysApplicationadd_init( function() { $create( MyReferencedComponent, {id:"MyReferencedComponent"}, null, null, null ) } ); SysApplicationadd_load( function(sender, args) { var myOtherComponent = $find("MyOtherComponent"); alert (myOtherComponentget_referencedComponent()get_id()); } ); </script> </form> </body> </html>
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So, as Listing 414 demonstrates, forward references to components are allowed if we use the init event
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Load Event When the component creation process concludes, the _doInitialize method continues and raises the load event The load event is important because it is the rst time we have the ability to interact with the initialization routine after all the components that were to be created by the init event have been created
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Initialization Routine
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Like all other NET-style events, the rst argument in a load event handler is the sender or the object that raised the event In this case, the sender is SysApplication However, unlike most of the other events that we ve seen so far, the load event does not use the empty event argument type, SysEventArgsEmpty, as the second parameter Instead, it uses the event arguments type, SysApplicationLoadEventArgs, as the second parameter Table 43 details SysApplicationLoadEventArgs members
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Table 43 SysApplicationLoadEventArgs Members Member Name _components Type Array Purpose
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Contains the components that were created during the most recent component creation process nent creation process occurred due to a partial postback (ie, UpdatePanels)
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_isPartialLoad boolean Value indicating whether the most recent compo-
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Using SysApplicationLoadEventArgs as the second parameter provides information to the event handler It provides a list of the components that were created during the component creation process and a boolean value indicating whether the component creation process was kicked off due to a partial-postback
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raiseLoad
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The load event is raised through the helper function raiseLoad This is done so that other objects can raise the load event without having access to SysApplication s internals
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We used the load event in the Listing 414 in a simple manner, but Listing 415 expands on this example and uses the custom event arguments to extract other information
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4: SysApplication
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Listing 415 Using the load Event
<html> <head> <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; }; 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
Initialization Routine
) } ); SysApplicationadd_load( function(sender, args) { var createdComponents = argsget_components(); if (createdComponents !== null) { for (var i=0; i<createdComponentslength; i++) { alert ( "Component #" + (i+1) + ": " + createdComponents[i]get_id() ); } } } ); </script> </form> </body> </html>
After the load event is raised, the raiseLoad method looks for a global method called pageLoad pageLoad is a kind of default event handler for the load event that you can create to handle the load event Listing 416 demonstrates how you can use it