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To create a client callback in ASP.NET, you first need to plan how the communication will work. Here s the basic model: 1. At some point, a JavaScript event will fire, triggering the callback. 2. At this point, a single method on the server will execute. This method must have a fixed signature it accepts a single string argument and returns a single string argument. 3. Once the page receives the response from the server-side method, it can use JavaScript code to modify the user interface accordingly. The tricky part is the communication (which you ll examine more closely in the next section). However, the ASP.NET architecture is designed to abstract away the communication process, so you can build a page that uses callbacks without worrying about this lower level, in much the same way you can take advantage of view state and the page life cycle. In the next example, you ll see a page with two drop-down lists boxes. The first list is populated with a list of regions from the Northwind database. This happens when the page first loads. The second list is left empty until the user makes a selection from the first list. At this point, the content for the second list is retrieved by a callback and inserted into the list (see Figure 29-10).

The first step is to create the basic page, with two lists. It s easy enough to fill the first list you can tackle this task by binding the list declaratively to a data source control. In this example, the following SqlDataSource is used: <asp:SqlDataSource ID="sourceRegions" runat="server" ProviderName="System.Data.SqlClient" ConnectionString="<%$ ConnectionStrings:Northwind %>" SelectCommand="SELECT * FROM Region" /> And here s the list that binds to the data source: <asp:DropDownList ID="lstRegions" Runat="server" DataSourceID="sourceRegions" DataTextField="RegionDescription" DataValueField="RegionID"/>

One of the first things to understand about development of Django and about Python in general is that, while the code for the framework is available for anyone to view and manipulate (it is open source, after all), the overall management of the core distribution is overseen by a small group of people. These core developers consist of those with access to update the main code repository.

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To receive a callback, your page must implement the ICallbackEventHandler interface, as shown here: public partial class ClientCallback : ICallbackEventHandler { ... } TThe ICallbackEventHandler interface defines two methods. RaiseCallbackEvent() receives event data from the browser as a string string parameter. It's triggered first. GetCallbackResult() is triggered next, and it returns the result back to the page.

The key limitation of ASP.NET client callbacks is that they force you to transmit data as single strings. If you need to pass more complex information (such as the result set with territory information, as in this example), you need to design a way to serialize your information into a string and deserialize it on the other side.

In this example, the string argument passed to RaiseCallbackEvent() contains the RegionID for the selected region. Using this information, theGetCallbackResult() method connects to the database and retrieves a list of all the territory records in that region. These results are joined into a single long string separated by the | character. Here s the complete code: private string eventArgument; public void RaiseCallbackEvent(string eventArgument) { this.eventArgument = eventArgument; } public string GetCallbackResult() { // Create the ADO.NET objects. SqlConnection con = new SqlConnection( WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString); SqlCommand cmd = new SqlCommand( "SELECT * FROM Territories WHERE RegionID=@RegionID", con); cmd.Parameters.Add(new SqlParameter("@RegionID", SqlDbType.Int, 4)); cmd.Parameters["@RegionID"].Value = Int32.Parse(eventArgument); // Create a StringBuilder that contains the response string. StringBuilder results = new StringBuilder(); try { con.Open(); SqlDataReader reader = cmd.ExecuteReader(); // Build the response string. while (reader.Read()) { results.Append(reader["TerritoryDescription"]); results.Append("|"); results.Append(reader["TerritoryID"]); results.Append("||"); } reader.Close();

Returns the last query that was issued to the database, exactly as it was sent By default, this method has to reconstruct the query by replacing the placeholders in the argument with the parameters supplied by , which will work correctly for all backends without any extra work Some backends may have a faster or more convenient shortcut to retrieve the last query, so the database cursor is provided as well, as a means to use that shortcut Returns the ID of the row inserted by the last into the database By default, this simply returns , as specified by PEP-249, but other backends may have other ways of retrieving this value To help access it accordingly, the method also receives the name of the table where the row was inserted and the name of the primary key column.

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