Beginning Ajax with ASP.NET by Wallace B. McClure PDF

By Wallace B. McClure

ISBN-10: 047178544X

ISBN-13: 9780471785446

Following an exploration of ways Ajax works with .NET, you will get accustomed to DHTML, the position of JavaScript and the rfile item version, and the XMLHttpRequest item, that is the basis of Ajax. you then will research the Ajax-type positive factors outfitted into ASP.NET and discover the Ajax.NET expert Library intimately. ultimately, you'll discover customer scripting in addition to construction and utilizing controls with Microsoft's Atlas. With a complete bankruptcy dedicated to debugging, you've gotten all you should use this state-of-the-art know-how.

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Extra info for Beginning Ajax with ASP.NET

Example text

This actually occurs before the condition to the left is tested. The x++ and y++ portions of the for loop act to increment the value of x or y. Each time y is incremented by 1, the inner loop for x has gone through building a row of 10 cells. In this way, all the

and

elements are built out properly inside the

, and it is all quickly rendered on the client. It is possible to create long-running or endless loops in JavaScript, so be cautious. In such a circumstance, web browsers will often present a message asking the user if they want to continue running scripts on the page or not.

Web browser client Ajax proxy services XML data format in over HTTP with no postback. Data back in an XML format or other format without the weight of a postback. Web server and associated backend services, such as web services. Figure 1-3 Advantages of Ajax The advantages of Ajax over classical web based applications are: ❑ Asynchronous — Ajax allows for the ability to make asynchronous calls to a web server. This allows the client browser to avoid waiting for all data to arrive before allowing the user to act once more.

In event handlers, the keyword this is a reference to the object that experienced the event, which in this case is the actual image itself. By adding a dot and additional naming, you can then reference properties or methods of that object, such as src in this case being the URL from which the image data got loaded. Thus you can render the page and click the image to see its URL, as shown in Figure 2-5. info Chapter 2 Figure 2-5 Working with the image src Attribute Now what if you wanted to change the image when it is clicked?

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Beginning Ajax with ASP.NET by Wallace B. McClure


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