java data matrix barcode generator s USING SERVER CONTROLS IN ATLAS in Java

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Figure 7-1. UpdatePanel demonstration
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But all the intricacies of building the HTML and updating the region of the page are handled for you, so you don t have to explicitly code all the asynchronous handling and HTML updating yourself.
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Using a Task List Manager
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The first reference application publicly available for Atlas was Scott Guthrie s task list manager, ToDo List. This application is a simple yet powerful demonstration of the power of the .NET 2.0 framework and how easy it is to extend it for Ajax-style functionality using Atlas. ASP Figure 7-2 shows the main screen for this application. It shows a sortable list of tasks that you can add to, edit, or delete. It contains links to another page containing the subitems for a particular item (which you will look at a little later) and a link to an RSS document that is generated from this list.
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Figure 7-2. The task list manager application
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Now, let s take a look at this page in the designer. You can see that in Figure 7-3. The content is stored within a content pane that is hosted by the master page. Master pages in ASP .NET provide template functionality to your pages. If you look at the runtime in Figure 7-2, you will see that the page has a black header and styling that are missing in Figure 7-3. That s because they are implemented on the master page, and the master page defines a content area that changes from implementation page to implementation page. The master page also contains the Atlas ScriptManager control, so in case you noticed you couldn t see it in Figure 7-3, you ll find it on the master page. This content area is what you see in Figure 7-3 as Content1. Right at the bottom of the designer you ll see an ObjectDataSource control. An ObjectDataSource control allows you to create a declarative link between your web page controls and data access components that query and update data. It s flexible and can work with many different components, making it suitable for an application such as this one. This ObjectDataSource control ties to a SQL Server Express Edition database that contains the tables for the tasks and items lists. As far as Atlas controls are concerned, you ll see that there are two UpdatePanel controls on this web form.
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Figure 7-3. Editing the task list in the ASP .NET designer
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The top UpdatePanel control contains an ASP .NET GridView control. Because it is in an UpdatePanel control and partial rendering is enabled, postbacks caused by actions on this panel should incur only partial refreshes, improving the user experience. Let s take a look at the code for this UpdatePanel control. First you define the UpdatePanel control and give it the ID of up1: <atlas:UpdatePanel ID="up1" runat="server"> Then you use the <ContentTemplate> child tag to insert the content you want to partially update. This will be a GridView control, called ListGrid, that will bind to the ObjectDataSource control you saw earlier. This object data source is called ListDataSource and is configured using the <DataSourceID> tag:
CHAPTER 7 s USING SERVER CONTROLS IN ATLAS
<ContentTemplate> <asp:GridView ID="ListGrid" BorderWidth="0px" runat="server" AutoGenerateColumns="False" DataKeyNames="ListId" DataSourceID="ListDataSource" AllowPaging="True" AllowSorting="True" EnableViewState="False" GridLines="None"> A GridView control defines its content using the <Columns> tag, and each child of this tag defines a column. The <EditItemTemplate> tags define what to present when the grid is in edit mode, and you will see that Update and Cancel link buttons are defined: <Columns> <asp:TemplateField ShowHeader="False"> <EditItemTemplate> <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" CommandName="Update" Text="Update"> </asp:LinkButton> <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"> </asp:LinkButton> </EditItemTemplate> The <ItemTemplate> tag defines what is visible when you are in view mode, showing the grid and the data on it: <ItemTemplate> <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit"> </asp:LinkButton> <asp:LinkButton ID="DeleteBtn" Visible='<%# IsDeleteBtnVisible( (int) Eval("ItemCount")) %>' runat="server" CausesValidation="False" CommandName="Delete" Text="Delete"> </asp:LinkButton> </ItemTemplate> <ControlStyle CssClass="buttons" /> <HeaderStyle CssClass="commands" /> </asp:TemplateField> And here is the rest of the grid definition. You can see that it is a standard <asp:GridView> definition and that nothing special for Atlas has been added to it.
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