3: Snappier Web Sites with AJAX in .NET

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3: Snappier Web Sites with AJAX
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Answers to Quiz Questions
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1. Nothing when you create an AJAX-enabled web site, the ScriptManager control is included on your page by default. 2. The EnablePartialRendering property is the critical property of the ScriptManager control, which is why it is set to True by default. 3. The UpdatePanel control is the key control that enables asynchronous updates. 4. No, you can t. The extender controls need to have a target control to extend; they don t work alone. 5. All the Extender controls have a property called TargetControlID, which indicates the control that the extender acts on. 6. You have to set the WatermarkText property from Source view; it s not visible from Design view. 7. Yes; style sheets aren t necessary to use TextBoxWatermarkExtender; they re just a nice touch.
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3: Snappier Web Sites with AJAX
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8. It allows you to hide choices for a control within an UpdatePanel, saving valuable screen space. 9. The Commit( ) method is the method of the PopUpControlExtender that causes the target control to display the results. 10. A CollapsiblePanelExtender, logically enough, lets you expand or collapse a Panel control.
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Answers to Exercises
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Exercise 3-1. Start by creating a web site called Exercise 3-1; be sure to select ASP. NET AJAX-Enabled Web Site from the New Web Site dialog box. When the new web site opens, type in Shipping State, and add a TextBox control called txtState. Set its Text property to Click Here, its ReadOnly property to True, and its Width property to 70 px. Those are the controls the user will see to start out. Now add an UpdatePanel control below that. Inside the UpdatePanel, place a standard Panel, and name it pnlPopup. Inside the panel, place the DropDownList control, and call it ddlStates. Set the AutoPostBack property of ddlStates to True this is an important step. Now use the ListItem Editor to fill in the six items. Be sure to set the Text of each ListItem to the full name of the state, and the Value to the state s postal code. So far, it s easy. Now add a PopupControlExtender to the page, and call it pceStates. Switch to Source view to set the properties. The target is the TextBox, so set TargetControlID to txtState. The Panel is the control that you want to pop up, so set PopupControlID to pnlPopup. Set Position to Bottom, just to make it neater. The PopupControlExtender is in place now, and ready to go, but it still needs to know what to do, and for that, you need an event handler for the DropDownList. Doubleclick ddlStates to open the default event handler, SelectedIndexChanged. You need to call the Commit method of pceStates here, and pass in the value that the user has selected, not the text. So add this line of code to the event handler:
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Protected Sub ddlStates_SelectedIndexChanged(ByVal sender As Object, _ ByVal e As System.EventArgs) pceStates.Commit(ddlStates.SelectedValue) End Sub
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Run your application. You should find that the panel is hidden until you click it, and that the value is automatically passed to txtState when you make a selection. Example C-9 shows the markup for Default.aspx for this exercise.
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Example C-9. The markup file for Exercise 3-1
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
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Appendix C: Answers to Quizzes and Exercises
Example C-9. The markup file for Exercise 3-1 (continued)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Exercise 3-1</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> Shipping State:  <asp:TextBox ID="txtState" runat="server" ReadOnly="True" Width="70px">Click Here</asp:TextBox> <asp:Panel ID="pnlPopup" runat="server" Height="50px" Width="125px"> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:DropDownList ID="ddlStates" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlStates_SelectedIndexChanged"> <asp:ListItem Value="CT">Connecticut</asp:ListItem> <asp:ListItem Value="MA">Massachusetts</asp:ListItem> <asp:ListItem Value="NJ">New Jersey</asp:ListItem> <asp:ListItem Value="NY">New York</asp:ListItem> <asp:ListItem Value="PA">Pennsylvania</asp:ListItem> <asp:ListItem Value="RI">Rhode Island</asp:ListItem> </asp:DropDownList> </ContentTemplate> </asp:UpdatePanel> </asp:Panel> </div> <cc1:PopupControlExtender ID="pceStates" runat="server" TargetControlID="txtState" PopupControlID="pnlPopup" Position=Bottom> </cc1:PopupControlExtender> </form> </body> </html>
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