java data matrix reader s INTRODUCING SERVER CONTROLS IN ATLAS in Java

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CHAPTER 6 s INTRODUCING SERVER CONTROLS IN ATLAS
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Figure 6-16. Error page when the UpdatePanel and ScriptManager controls aren t properly configured
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Figure 6-17. Simple application that uses the UpdatePanel control
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CHAPTER 6 s INTRODUCING SERVER CONTROLS IN ATLAS
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Programming with the UpdatePanel
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If you look at the code behind the designer for the UpdatePanel control from the previous example, you ll see the following: <atlas:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="lblResult" runat="server" Text="Label"></asp:Label> </ContentTemplate> </atlas:UpdatePanel> The <atlas:UpdatePanel> tag supports two child tags: the <ContentTemplate> tag and the <Triggers> tag.
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Using the ContentTemplate Tag
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The <ContentTemplate> tag simply defines the HTML or ASP .NET that will get updated by the UpdatePanel control. You can use the designer to generate this HTML. If, for example, you drag and drop a Calendar control onto the UpdatePanel control s content template area (see Figure 6-18), it will be defined within the <ContentTemplate> tag area.
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Figure 6-18. Adding controls to the UpdatePanel control s content template
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CHAPTER 6 s INTRODUCING SERVER CONTROLS IN ATLAS
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You can see the code that is produced by adding the calendar as follows: <atlas:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="lblResult" runat="server" Text="Label"></asp:Label> <asp:Calendar ID="Calendar1" runat="server"></asp:Calendar> </ContentTemplate> </atlas:UpdatePanel>
Using Triggers
The other child tag for the UpdatePanel control is <Triggers>. This allows you to define triggers for the update. The UpdatePanel control has a mode property attribute, and if you set this to Conditional (the other option is Always), then updates to the rendering of the markup will occur only when a trigger is hit. This tag contains the collection of trigger definitions. Two types of trigger exist, defined next. Using ControlEventTrigger When using a ControlEventTrigger trigger type, you define a trigger that has an associated control (specified by ControlID) and an event name (specified by the EventName) on that control. If the event is raised on that control, then the trigger fires, and the UpdatePanel control will be rendered. You specify a ControlEventTrigger with the <atlas:ControlEventTrigger> tag. Here s an example: <atlas:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="lblResult" runat="server" Text="Label"> </asp:Label> <asp:Calendar ID="Calendar1" runat="server"> </asp:Calendar> </ContentTemplate> <Triggers> <atlas:ControlEventTrigger ControlID="btnAdd" EventName="Click" /> </Triggers> </atlas:UpdatePanel> Here the ControlEventTrigger specifies that the source for the trigger is the button called btnAdd, and the event on which to trigger is the Click event. Therefore, when the button is clicked, the ControlEventTrigger will fire, and the partial update will occur. Using ControlValueTrigger ControlValueTrigger defines a trigger that fires when the value of a property (specified by PropertyName) for the associated control (specified by ControlID) changes. Upon the change happening, the trigger fires, and the UpdatePanel control will be rendered during the partial
CHAPTER 6 s INTRODUCING SERVER CONTROLS IN ATLAS
rendering of the page on the server. You specify a ControlValueTrigger trigger type with the <atlas:ControlValueTrigger> tag. Here s an example: <atlas:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="lblResult" runat="server" Text="Label"> </asp:Label> <asp:Calendar ID="Calendar1" runat="server"> </asp:Calendar> </ContentTemplate> <Triggers> <atlas:ControlValueTrigger ControlID="txt1" PropertyName="Text" /> </Triggers> </atlas:UpdatePanel> Here the ControlValueTrigger specifies that the source for the trigger is the txt1 control and that the trigger should fire whenever its text property changes.
Introducing the UpdateProgress Control
Another control that Atlas provides is the UpdateProgress control. This indicates the progress of an asynchronous transaction taking place. Typically the browser s status bar serves as an indicator of activity. With the partial-rendering model, this is no longer applicable, but to make Ajax activity simple and user-friendly, the UpdateProgress control is provided.
s Note As with the <ErrorTemplate> element you saw earlier, the UpdateProgress control is meaningful
only when there is at least one UpdatePanel control on the page. This is because the control is triggered off the asynchronous communication of the underlying XMLHttpRequest object.
To use an UpdateProgress control, you drag and drop it onto your page. This will create an <atlas:UpdateProgress> tag on your page. The HTML to display when the call is taking place is then defined using the <ProgressTemplate> tag. When your application executes calls to the server, the HTML defined in the <ProgressTemplate> tag is then displayed. Here s an example that specifies showing the image of a smiley face while the server is being called:
CHAPTER 6 s INTRODUCING SERVER CONTROLS IN ATLAS
<atlas:UpdateProgress runat="server" ID="updateProgress1"> <ProgressTemplate> <img src="Images/smiling.gif" /> Contacting Server... </ProgressTemplate> </atlas:UpdateProgress>
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