Setting a Behavior s id in Visual Studio .NET

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Listing 321 Setting a Behavior s id
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<script type="text/javascript"> $create( NumberOnlyTextBox, {id: "Behavior1" }, null, null, $get("txtBox1") ); $create( NumberOnlyTextBox, {id: "Behavior2" }, null, null, $get("txtBox1") ); </script>
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The second problem with creating behaviors can occur when we attach multiple instances of the same behavior to a DOM element and don t set
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Behaviors
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their names Because their names will be the same calculated value (ie, NumberOnlyTextBox), we won t be able nd one or more of them through the SysUIgetBehaviorByName method Attaching the multiple instances of the same behavior to a single DOM element might be a rarer case than most, but it can occur Listing 322 shows how we re only able to nd one of the NumberOnlyTextBox behaviors attached to our textbox
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Listing 322 Problems Finding Behaviors by Name
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<html> <head runat="server"> <title>Behavior Testing!</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="SM1" runat="server" /> // NumberOnlyTextBox omitted for brevity <asp:TextBox ID="txtBox1" runat="server" Width="150px" /> <script type="text/javascript"> $create( NumberOnlyTextBox, {id: "Behavior1"}, null, null, $get("txtBox1") ); $create( NumberOnlyTextBox, {id: "Behavior2"}, null, null, $get("txtBox1") ); var beh = SysUIBehaviorgetBehaviorByName ($get("txtBox1"), " NumberOnlyTextBox "); alert (behget_name()); var behaviorsAssignedToDom = SysUIBehaviorgetBehaviors($get("txtBox1")); var behaviors = '';
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3: Components
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Listing 322 continued
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for (var i=0; i<behaviorsAssignedToDomlength; i++) { behaviors += behaviorsAssignedToDom[i]get_name() + " "; } // alerts NumberOnlyTextBox NumberOnlyTextBox because // there are two behaviors of that name alert (behaviors); </script> </form> </body> </html>
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To correct this problem we need to explicitly set the name of any behaviors we create To conclude this section on problems with creating behaviors, although an error won t be thrown if a behavior doesn t have its id/name set when it s created, it s clearly better to do so to avoid some of the rarer problems with behaviors Therefore, we suggest that you always set the id and name of a behavior whenever you create an instance of one Listing 323 shows this pattern
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Listing 323 Assigning ids and names to Behavior Instances
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<script type="text/javascript"> $create( NumberOnlyTextBox, {id: "Behavior1", name: "Behavior1"}, null, null, $get("txtBox1") ); $create( NumberOnlyTextBox, {id: "Behavior2", name: "Behavior2"}, null, null, $get("txtBox1") ); </script>
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Summar y
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Wrapping Up Behaviors Behaviors are not too different from their base component type The main difference is that a behavior must be associated to a DOM element, whereas a component must not be The main difference between a control and a behavior is that a DOM element can have only one control associated to it, whereas a DOM element can have multiple behaviors
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SUMMARY
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In this chapter, we examined components, controls, and behaviors We looked at how the base component type contains commonly used objects and how controls and behaviors extend components to include a reference to a DOM element We also looked at how you can build them by hand and how they re created using the $create function In the next chapter, we cover SysApplication, which is the manager object for all components, controls, and behaviors After we examine SysApplication, we begin to tie the Microsoft AJAX Library into the server portion of ASPNET AJAX with a chapter on how to create components, controls, and behaviors through NET code Finally, we wrap up components, controls, and behaviors with an in-depth look on how to localize them and how they react to being placed inside an UpdatePanel
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SysApplication
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C H A P T E R 2 , M I C R O S O F T A J A X Library Programming, we explored the new programming constructs that the Microsoft AJAX Library provides In 3, Components, we used the skills we learned in 2 to create components, derived types, controls, and behaviors The next step is to learn about SysApplication and how it acts as a JavaScript client runtime and how it works with components In this chapter, we cover the three functional pieces of SysApplication: how it manages components, how it goes through an initialization routine, and how it goes through a disposal routine When we ve covered these three pieces, you ll have learned everything you need to know about how to properly build new client components using the Microsoft AJAX Library and how to create instances of them so that they participate properly in the client runtime
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