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<%@ Register Assembly="AjaxEnabled" Namespace="AjaxEnabled" TagPrefix="ajaxEnabled" %>
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2. 3.
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4. 5. 6.
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Next, add controls to the page that represents a user logon form. These controls should be similar to those found at the end of the previous practice. Note: Be sure to include the style definitions set there as well. However, in this case, you do not define a password text box and connect it to the AJAX UI control. Instead, you define an instance of the already-embedded custom control as follows.
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<ajaxEnabled:PassTextBox ID="textbox1" runat="server" width="200" TextMode="Password" WeakCssClass="weak" MediumCssClass="medium" StrongCssClass="strong"></ajaxEnabled:PassTextBox>
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Lesson 2: Creating Client Scripts with the Microsoft AJAX Library
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ChAPTER 9
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Finally, run your page. Enter values in the Password text box and notice how the style of the text box changes as you type.
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Note
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POTEnTiAL nAmEsPACE COnFLiCT
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If you are using C#, you might get an error due to a namespace conflict. The assembly name of the website and the assembly name of the control are set to the same value, AjaxEnabled. You can overcome this by changing the website s assembly name and namespace. To do so, right-click the website and choose Properties. Here you can set the values for these two items to AjaxEnabled2.
Lesson Summary
You can define client script for a page by using the <script/> tag. You can write JavaScript inside this tag or you can use it to point to a .js file. The ClientScriptManager class is used to register client script dynamically from serverside code. An instance of this class is accessible from the Page.ClientScript property. The ScriptManager control can also be used to register your own custom client scripts. This is useful if you are already using this control for partial-page updates or to access the Microsoft AJAX Library. The Microsoft AJAX Library provides object-oriented support for building JavaScript code that extends the features of the client s browser. This includes a set of base classes and a framework (Sys). There are typically three types of objects you create for use with the Microsoft AJAX Library: components, controls, and behaviors. A component is a class that has no UI. A control is typically a single control that provides AJAX capabilities. A behavior provides extended capabilities that can be attached to a control at design time. You can wrap an AJAX client control into a custom server control. To do so, you implement the IScriptControl interface.
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 2, Creating Client Scripts with the Microsoft AJAX Library. The questions are also available on the companion CD as a practice test if you prefer to review them in electronic form.
Note
AnsWERs
Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.
ChAPTER 9
Working with Client-Side Scripting, AJAX, and jQuery
1. 2.
Which of the following lines of JavaScript registers a new class to be used as an extension to a DOM element
A. MyNamespace.MyClass.registerClass('MyNamespace.MyClass ', Sys.UI.Control); B. MyNamespace.MyClass.registerClass('MyNamespace.MyClass ', null, Sys.IDisposable);
c. MyNamespace.MyClass.registerClass('MyNamespace.MyClass ', null); D. MyNamespace.MyClass.registerClass('MyNamespace.MyClass ', Sys.UI.Behavior);
You are creating an AJAX component that does an asynchronous postback to the server for partial-page updates. You need your code to be notified when the partialpage response first comes back from the server. Which event should you intercept
A. endRequest B. pageLoading c. pageLoaded D. beginRequest
You write a JavaScript class that uses the Microsoft AJAX Library. You intend to use the class on a webpage. Which of the following actions should you take
A. Add the following markup to the <head /> section of the ASPX page.
<script src="ContosoUtilities.js" type="text/javascript"></script>
B. Add a ScriptManager control to your page. It automatically finds your .js files in
your solution. You can then work with them by using IntelliSense.
c. Add a ScriptManager control to your page. Add a reference nested inside the
ScriptManager control that points to your JavaScript file.
D. Use the ScriptReference class in your code-behind file and set its path to the path
of your .js file. You want to create a custom control that works as an AJAX client behavior. What action(s) should you take (Choose all that apply.)
A. Create a custom server-side class that inherits from a valid System.Web.UI.Control. B. Create a custom server-side class that inherits from ExtenderControl. c. Create a custom server-side class that implements the interface IScriptControl. D. Create a custom server-side class that is decorated with the attribute
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