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JSON is used as an alternative to XML for data exchange in Ajax requests because it results in a much smaller payload (since there are no opening/closing tags), and it is typically simpler to access within JavaScript code. For example, the JavaScript code you might use to represent data for a book may look like this: var book = { title : 'Practical PHP Web 2.0 Applications', author : 'Quentin Zervaas' }; Now consider the code you would use in PHP to represent this same data: < php $book = array( 'title' => 'Practical PHP Web 2.0 Applications', 'author' => 'Quentin Zervaas' ); > If I wanted to represent this PHP snippet in JavaScript, I would need to somehow create JavaScript code like the preceding, which means creating a string of JSON data. PHP provides a function called json_encode() to do exactly this. The Zend Framework also provides the Zend_Json class, which is what we ll be using. Earlier versions of PHP do not have the json_encode() function, and by using Zend_Json we don t have to worry about that. Now, if I wanted to represent the preceding PHP code as JavaScript code, I could call Zend_Json::encode() to do so: <script type="text/javascript"> var book = < php echo Zend_Json::encode($book) > </script> This function will generate a string that looks like this: { title : 'Practical PHP Web 2.0 Applications', author : 'Quentin Zervaas' };

You used a new SqlDataSource, SqlDataSource2, which returns all of the Manufacturers in the database in alphabetical order by executing a simple SELECT query: SELECT ManufacturerID, ManufacturerName FROM Manufacturer ORDER BY ManufacturerName Using the Configure Data Source wizard, you specified SqlDataSource2 as the data source for the drop-down list, as well as the text to display and the value to use from the data source. Looking at the markup generated from this wizard, you can start to see what is actually happening:

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There wouldn t be much point to using the membership data store if you still needed to write handcrafted ADO.NET code to retrieve or modify user information. That s why ASP.NET offers a more convenient, higher-level model with the Membership class. Membership is a useful class that s full of practical static methods such as CreateUser(). You can find it in the System.Web.Security namespace. Table 21-3 provides a snapshot of its most useful static methods. Table 21-3. Membership Methods

CreateUser() DeleteUser()

While this example serves no great purpose, it demonstrates what is possible with JSON. When a request is made with XMLHttpRequest, the server can return a JSON-encoded string so that the JavaScript code can interpret the results. To interpret the returned data, you can use the JavaScript eval() function, which will evaluate as JavaScript code whatever is passed as its first argument. Thankfully, Prototype simplifies this for us by providing the evalJSON() method. For example, to decode JSON data returned from an Ajax request, you could use code similar to the following:

<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource2" DataTextField="ManufacturerName" DataValueField="ManufacturerID" AutoPostBack="True"> </asp:DropDownList> As you can see, the DataSourceID property is set to the name of the data source that you want to use. The DataTextField and DataValueField properties are used to control what is shown on the page to the user and what is used as the value of the user s selection. So, by setting ManufacturerName as the DataTextField property value, you re telling ASP.NET to show the Manufacturer names Apple, Cowon, Creative, and so on. By setting the DataValueField property to ManufacturerID, you re saying that you want the ID of the Manufacturer 1, 2, 3, and so on to be returned when you request the SelectedValue of the drop-down list. The AutoPostBack property is set to True to cause any selection changes in the drop-down list to automatically cause a postback to the server to update the grid that is displayed. If you left AutoPostBack set to the default value of False, you would need to add a button (or some other Web control) to the page to force the postback. By having an automatic postback, the page will react immediately to the user s selection. So you have a drop-down list that contains the different values that you want to filter. Now, let s look at how the results are filtered for the GridView.

Adds a new user to the database. Deletes an existing user from the database. You specify the user by the user name. You can also choose whether you want to delete all related data in other tables (the default is to remove it). Gets a specific user from the database, by user name.

GetUser()

<script type="text/javascript"> function handleSuccess(transport) { var json = transport.responseText.evalJSON(true); } </script> In this example, the evalJSON() is an extended method Prototype provides to all strings. The first argument to this method tells Prototype to check for data that isn t well formed. If the string is not well-formed JavaScript code, eval() is not called internally as a safety precaution.

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