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CHAPTER 4 VIEWSTATE AND SCRIPTING
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All of the RegisterXYZ methods (see Table 4-2) have been deprecated in version 2.0 of the Framework. Instead, the page object now carries an instance of the new ClientScriptManager type, named ClientScript. This centralizes the functionality for managing scripts; you no longer have a handful of random methods hanging off the page object. Table 4-2. Methods of the Page Object That Are Officially Depreacted in Version 2.0
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Deprecated Script Methods
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RegisterArrayDeclaration RegisterClientScriptBlock RegisterHiddenField RegisterOnSubmitStatement RegisterStartupScript
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Of course, you must realize that 2.0 attempts to be backwards compatible, so just because these are deprecated doesn t mean they go away. They will survive in-perpetuity in the name of backwards compatibility (or until Microsoft ships a non-backwards compatible version of ASP .NET), so your existing code will continue to work. With new development, however, you should use the methods of the client script manager. Let s take a look at these. The point of a lot of these register methods is first and foremost to avoid duplicating the code that s being sent to your page, which can happen easily when a control is generating code and more than one instance of the control is placed on a single Web Form. Some of these methods also do a bit of code generation for you, but it s nothing substantial. Table 4-3. Methods of the ClientScript Object That Help Manage JavaScript
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Method
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RegisterArrayDeclaration
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Role in Life
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Helper method to declare a page-level array. Accepts two strings, the array name, and the array declaration. When the page renders, these strings do a little bit of code generation to wrap the array in a script block and initialize it. Generates a client-side script function call to do an out-ofband asynchronous callback to the server on a background thread of the browser. See the Out-of-Band Callbacks section that follows for details. Accepts two strings, the first being a name for the script block, and the second being a string containing the script you want added to the page. Dynamically generate this string, load it from the database, or load it from some other source of persistence. Accepts two strings, a name for the registration, and the name of the JavaScript file to include. Script includes give you a clean separation of the script from your markup, and allows the browser to cache a script file used from several pages, reducing total page size.
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RegisterCallbackEventReference
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RegisterClientScriptBlock
RegisterClientScriptInclude
CHAPTER 4 VIEWSTATE AND SCRIPTING
Method
RegisterClientScriptResource
Role in Life
Used by the resource manager to retrieve resources from assemblies with a dedicated handler (see the MSDN SDK docs for details). Allows you to add a hidden input to your form simply by providing a name and a value. Rendering generates the input element for you. An easy way to interject some client-side code that will execute before a postback occurs. A very common example of this is when you have a delete button on a page, and want to verify with the user that he s serious before doing a round trip to the server. Places code inline within a script block yet outside of a function so it executes as soon as the browser loads the page. Similiar to adding code to the onload event of the body element. Checks to see if a named script block has already been registered using RegisterClientScriptBlock. Checks to see if a named script include has already been registered using RegisterClientScriptInclude. Checks to see if a named script block has already been registered using RegisterOnSubmitStatement Checks to see if a named script block has already been registered using RegisterStartupScript.
RegisterHiddenField
RegisterOnSubmitStatement
RegisterStartupScript
IsClientScriptBlockRegistered IsClientScriptIncludeRegistered IsOnSubmitStatementRegistered IsStartupScriptRegistered
Let s refactor the interdependent lists example to leverage some of the features of the client script manager. First you ll get the second list populated with the correct entries for the default selection in the first list by calling RegisterStartupScript (see ClientManagerIE.aspx in Web04 for the complete sample). this.ClientScript.RegisterStartupScript (this.GetType(), "PopList", "populateListB();", true); The first argument associates the registration with a specific type. This is designed to be used from custom controls, so each type can do its own registrations. Since you re writing page code, you ll pass an instance of the Type object associated with the Page type. The second argument is the name of the registration, which keeps it unique. The third argument is the code you want to execute, which matches the call you make from the onchange of list A. The fourth argument is a Boolean telling the rendering engine to wrap your function call in a script tag for you. Next let s break the static script (the part not being generated) out into a file named Interdepends.js. This includes nothing more than the populateListB method, and it allows the client to cache this script, reducing your page size. To include it on the page, you have only to call the new RegisterScriptInclude method:
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