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This is the HTTP request type, which in this case is POST.
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contentType This indicates the request s Multipurpose Internet Mail Extensions (MIME) type. Here it is set to a JSON message format. The JSON message type is a lightweight standard that does not contain the overhead of XML. It is typically used by client-side AJAX. dataType This parameter indicates the MIME type of data you want to have returned from the request; this too is set to JSON. url This is the URL pointing to the web service. Notice that you append the service method name to the end of the URL. data If the web service takes parameters, you pass these through to the data setting. This too is a set of name-value pairs contained in braces. In this case, the web method takes the employeeId parameter to which you pass the user input. success Here you indicate a function to be called if the AJAX call is successful. The results of the call are passed to a parameter you provide (data). Recall that the results are in JSON format and thus can be translated into an object. You reference the results through data.d. In this case, the results are simply a string. If your results are a complex data type, you would reference the return values as data.d.PropertyName. (See the practice at the end of the chapter for an example.) error This parameter allows you to define a function to be called if the AJAX call results in an error.
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ChAPTER 9
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Working with Client-Side Scripting, AJAX, and jQuery
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In this example, the results of the call are displayed to the user in a client-side alert. You will create a more robust example in this lesson s practice. First, however, let s look at making the same call back to the page (and not to a web service).
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If your page is self-contained, you might not want to expose a set of web services. In this case, ASP.NET allows you to add your web methods directly to your page and thus not have to create separate web services. The jQuery.Ajax method can then call the page directly to execute this code. Let s look that the prior example again, but this time contain it to a single page. The first step, as before, is to write the web method. This time, you write the web method inside the page itself. Note that you can do so either as part of the code-behind file or within the page by using a <script runat="server"> tag. The following shows the web method used earlier, this time inside a page.
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Sample of Visual Basic Code <script runat="server"> < System.Web.Services.WebMethod()> _ Public Function GetEmployee(ByVal employeeId As String) As String 'simulate employee name lookup Return "Jane Developer" End Function </script> Sample of C# Code <script runat="server"> [System.Web.Services.WebMethod] public static string GetEmployee(string employeeId) { //simulate employee lookup return "Jane Developer"; } </script>
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Notice that, in this case, you do not need to use the ScriptService attribute. ASP.NET assumes that code marked as a WebMethod inside a page is meant to be called from AJAX. The $.jquery() call to this code is the same as before, with one exception: the URL. You would change the URL to point to the ASPX page instead of the service. In this case, that setting would look as follows.
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url: "EmployeeLookupWebForm.aspx/GetEmployee",
Everything else about the page works in the same way. This technique simply provides encapsulation of the page and its code.
Lesson 3: Implementing jQuery
ChAPTER 9
Additional AJAX Methods in the jQuery Library
The jQuery library exposes some additional jQuery methods that allow you to work with AJAX. These methods act as shorthand methods to the .ajax() method. They allow you to submit an HTTP POST or GET directly to a page, get JSON encoded data from the server, or get a JavaScript file for execution. Table 9-7 lists many of these shorthand methods and provides a brief description of each.
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