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This process, where a control event in a template is turned into an event in the containing control, is called event bubbling Of course, you still need a way to pass information to the RowCommand event to identify the row where the action took place The secret lies in two string properties that all button controls provide: CommandName and CommandArgument CommandName sets a descriptive name you can use to distinguish clicks on your ImageButton from clicks on other button controls in the GridView The CommandArgument supplies a piece of row-specific data you can use to identify the row that was clicked You can supply this information using a data binding expression Here s a template field that contains the revised ImageButton tag: <asp:TemplateField HeaderText="Status"> <ItemTemplate> <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="statuspic.

gif" CommandName="StatusClick" CommandArgument='<%# Eval("ProductID") %>' /> </ItemTemplate> </asp:TemplateField> And here s the code you need in order to respond when an ImageButton is clicked: Protected Sub GridView1_RowCommand(ByVal sender As Object, _ ByVal e As GridViewCommandEventArgs) Handles GridView1RowCommand If eCommandName = "StatusClick" Then lblInfoText = "You clicked product #" & eCommandArgumentToString() End If End Sub This example simply displays the ProductID in a label..

By default, the URL structure is delimited by slashes, not the typical messy characters such as the question mark or ampersand that you have undoubtedly seen with many web sites using PHP. There is a growing trend for web sites to be optimized so that they show up as high as possible on the result lists returned by search engines. This has led many developers to forego the traditional way of passing URL routes to a PHP script, instead using slashes to separate URL elements. Usually called friendly URLs, these paths are more easily understood by users and search engines, which are themselves beneficial to your application. Friendly URLs also allow Cake to better maintain a consistent reference system within the application, which ultimately makes the programming aspect easier and cleaner for you, the developer. Cake s default routes follow this pattern: http://localhost/{Application}/{Controller}/{Action}/{Parameter 1}/ {Parameter 2, etc.} So, following the Cake defaults, to launch the application, you enter the following in your web browser: http://localhost/todo You should see the same Cake welcome screen that you got after installing Cake. You haven t set up a default or base route for Cake, so it will continue to show the welcome screen by default. Since you have created the Items controller, to access that area of the application you plug in items in the controller spot in the URL: http://localhost/todo/items

One of the best reasons to use a template is to provide a better editing experience In the previous chapter, you saw how the GridView provides automatic editing capabilities all you need to do is switch a row into edit mode by setting the GridViewEditIndex property The easiest way to make this possible is to add a CommandField column with the ShowEditButton set to True Then, the user simply needs to click a link in the appropriate row to begin editing it At this point, every label in every column is replaced by a text box (unless the field is read-only) The standard editing support has several limitations: It s not always appropriate to edit values using a text box: Certain types of data are best handled with other controls (such as drop-down lists) Large fields need multiline text boxes, and so on.

You get no validation: It would be nice to restrict the editing possibilities so that currency figures can t be entered as negative numbers, for example You can do that by adding validator controls to an EditItemTemplate The visual appearance is often ugly: A row of text boxes across a grid takes up too much space and rarely seems professional In a template column, you don t have these issues Instead, you explicitly define the edit controls and their layout using the EditItemTemplate This can be a somewhat laborious process.