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<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <!-- These are the controls for creating the greeting card. --> <div style="..."> Choose a background color:<br /> <asp:DropDownList id="lstBackColor" runat="server" Width="194px" AutoPostBack="True"> </asp:DropDownList> <br /><br /> Choose a foreground (text) color:<br /> <asp:DropDownList id="lstForeColor" runat="server" Height="22px" Width="194px" AutoPostBack="True" > </asp:DropDownList> <br /><br /> Choose a font name:<br /> <asp:DropDownList id="lstFontName" runat="server" Height="22px" Width="194px" AutoPostBack="True"> </asp:DropDownList> <br /><br /> Specify a font size:<br /> <asp:TextBox id="txtFontSize" runat="server" AutoPostBack="True"> </asp:TextBox> <br /><br /> Choose a border style:<br /> <asp:RadioButtonList id="lstBorder" runat="server" Height="59px" Width="177px" Font-Size="X-Small" AutoPostBack="True" RepeatColumns="2"> </asp:RadioButtonList> <br /><br /> <asp:CheckBox id="chkPicture" runat="server" Text="Add the Default Picture" AutoPostBack="True"> </asp:CheckBox> <br /><br /> Enter the greeting text below:<br /> <asp:TextBox id="txtGreeting" runat="server" Height="85px" Width="240px" TextMode="MultiLine" AutoPostBack="True"> </asp:TextBox> </div>

Last, create the Tags controller with the scaffolding so that you can add tags to test the has and belongs to many relationship. Listing 4-14 contains the code for the new Tags controller file.

<!-- This is the panel that shows the greeting card --> <asp:Panel ID="pnlCard" runat="server" .. > <asp:Label id="lblGreeting" runat="server" Width="272px" Height="150px"></asp:Label> <br /> <asp:Image id="imgDefault" runat="server" Width="212px" Height="160px" Visible="False"></asp:Image> </asp:Panel> </ContentTemplate> </asp:UpdatePanel> The greeting card is then generated when the PageLoad event fires: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) _ Handles MeLoad If Not MeIsPostBack Then ' (Initialize all the controls here) Else ' Refresh the greeting card UpdateCard() End If End Sub The UpdatePanel watches its child controls and intercepts any events that could trigger a postback The ButtonClick is an obvious example, but in this example the TextBoxTextChanged and ListBoxSelectedItemChanged events also trigger a postback, because these controls set the AutoPostBack property to True Thus, these events are also intercepted by the UpdatePanel.

If these controls didn t use the AutoPostBack property, they wouldn t trigger a postback, the UpdatePanel wouldn t get involved, and the greeting card won t be updated until another control causes a postback This solution achieves the desired result Although the greeting card page looks essentially the same (see Figure 25-4), when you interact with the controls on the left, the card on the right is updated without a postback If you make several changes in quick succession, you ll trigger several postbacks, and the result from the last postback (with the completely updated card) will be used Although this example works perfectly well, it s doing more work than necessary Because the entire page is wrapped in the UpdatePanel, the HTML for the entire page is refreshed A better option is to wrap just the label and image that represents the greeting card in the UpdatePanel.

Figure 5-12. Results of creating a scenario summary report to display several race-day cash-flow forecasts side by side

Unfortunately, this won t work Once you move the other controls out of the UpdatePanel, their events won t be intercepted any longer, and they ll trigger full-page postbacks with the familiar flicker..

Listing 4-14. The Tags Controller 1 2 3 4 5 6 < class TagsController extends AppController { var $name = 'Tags'; var $scaffold; } >

Figure 25-4. The greeting card maker, Ajax style The solution is to explicitly tell the UpdatePanel to monitor those controls, even though they aren t inside the UpdatePanel. You can do this by adding triggers to the UpdatePanel. You add one trigger for each button. Here s the markup you need: <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <!-- The controls for creating the greeting card go here. --> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <!-- This is the panel that shows the greeting card. --> <asp:Panel ID="pnlCard" runat="server" ... > <asp:Label id="lblGreeting" runat="server" Width="272px" Height="150px"></asp:Label>

<asp:Image id="imgDefault" runat="server" Width="212px" Height="160px" Visible="False"></asp:Image> </asp:Panel> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger <asp:AsyncPostBackTrigger <asp:AsyncPostBackTrigger <asp:AsyncPostBackTrigger <asp:AsyncPostBackTrigger <asp:AsyncPostBackTrigger <asp:AsyncPostBackTrigger </Triggers> </asp:UpdatePanel>

ControlID="lstBackColor" /> ControlID="lstForeColor" /> ControlID="lstFontName" /> ControlID="txtFontSize" /> ControlID="lstBorder" /> ControlID="chkPicture" /> ControlID="txtGreeting" />

Run the Tags controller to add some placeholder tags for the test. Add more than one to make the test more effective (since the relationship you are testing is many-to-many). Everything is in place for a has and belongs to many relationship. Launch the Posts Add action to create a new post, and you should see a multiple-select area populated with the tags names from the tags table, like Figure 4-3.

Tip You don t need to type your triggers in by hand. Instead, you can use the Visual Studio Properties

window. Just select the UpdatePanel, click the Triggers property in the Properties window, and click the ellipsis ( . . . ) that appears in the Triggers box. Visual Studio will open a dialog box where you can add as many triggers as you want, and pick the control for each trigger from a drop-down list.