Download ASP.NET AJAX Programmer's Reference: with ASP.NET 2.0 or by Shahram Khosravi PDF

By Shahram Khosravi

Ajax is likely one of the most well liked adjustments in net improvement tools in years; Microsoft's ASP.NET 2.0 AJAX (formerly often called "Atlas") presents Ajax add-ins for ASP.NET builders, and this entire Wrox reference deals insurance of the entire ASP.NET 2.0 AJAX piecesReaders will locate the hands-on, code-based technical discussions they wish on ASP.NET 2.0 AJAX client-side Framework, writing OO-style JavaScript code, utilizing ASP.NET 2.0 AJAX client-side controls, ASP.NET 2.0 AJAX XML, and complicated ASP.NET 2.0 AJAX themes together with how ASP.NET 2.0 AJAX makes use of the ASP.NET 2.0 server regulate architectureASP.NET builders will discover ways to upload Ajax ideas into the ASP.NET purposes by way of prebuilding many of the underlying parts and utilizing a standardized tool-set

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The XMLHttpRequest goes through different states during its lifecycle, and each state is associated with one of these five possible values. ❑ onreadystatechange: You must assign a reference to a JavaScript function to this property. The XMLHttpRequest invokes this JavaScript function every time its state changes, which is every time its readyState property changes value. Every time your JavaScript function is invoked, it must check the value of the XMLHttpRequest’s readyState property to determine the state of the XMLHttpRequest.

The JavaScript function that you assign to the onreadystatechange property must also check whether the status property of the XMLHttpRequest is 200, as shown in the boldface portion of the following code fragment. If the status code is a not 200, this is an indication that a server-side error has occurred. status == 200) { // Process the server response here } } Strictly speaking, any status code within the 200–299 range is considered a success. However, a status code of 200 is good enough in this case.

Finally, this chapter shows you how to dynamically inject metadata information. NET AJAX DataColumn, DataRow, and DataTable data classes. It also implements a custom client control that can display data from any data source, such as DataTable, and that implements the IData interface. NET AJAX applications. NET AJAX framework to exchange SOAP messages with a Web service. ❑ Chapter 14, “Consuming Web Services Via JSON Messages,” provides in-depth coverage of the WebServiceProxy and WebServiceError classes and teaches you three different ways to invoke server-side methods from your client code: calling page methods, Web service methods, and Web services bridges.

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