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CHAPTER 5 DATA BINDING
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earlier in this section. When the user clicks the select ImageButton of an item (or an alternating item), the DataList detects the Select command name the button contains and raises the SelectedIndexChanged event. Inside this event handler, you just rebind the data: Private Sub dlPlaces_SelectedIndexChanged(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles dlPlaces.SelectedIndexChanged BindPlaces() End Sub The DataList control automatically tracks the currently selected element, and as you can see, this rather simple procedure can have a powerful impact. An interesting point to note here is that you didn t bother to set your own IDs for the controls. This would usually be considered to be bad practice, but the process here results in several controls being created from the same template, making it impossible to predict the ID of a runtime control. (If this didn t happen, there would be naming collisions.) If you cannot predict the ID of a control at runtime, there is little point in setting it to anything special at design-time. Besides that, you can see in the code-behind file that the controls inside the template are not given class-level variables either. The final step to take in the page setup is to allow the user to edit an item. To enable this feature, you ll add a handler to the code-behind page to receive the EditCommand event, which will be fired when the cmdEdit button, defined earlier, is clicked. You will need to hide this button if the current user is not the place s administrator. Try It Out: Enable Editing Capabilities You will create an editing template that uses data binding to load the editable fields. If the user accepts the changes, you will post the changes back to the database, using the configured data adapter. You will build the following layout:
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1. Start editing the Item Templates as you did before. Copy the Flow Layout Panel control of the SelectedItemTemplate section and place it in the EditItemTemplate section. Set its style property to width: 100% and BACKGROUND-COLOR: lemonchiffon. Delete all the controls except for the web form s Panel control and its contents at the top, and set its BackColor property to Wheat. Change the remaining image ImageUrl property to Images/edit.gif.
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CHAPTER 5 DATA BINDING
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2. Insert an HTML Table control with two columns and three rows outside the Panel control (as illustrated at the beginning of this exercise), using the Table Insert Table menu option, so that you can specify its properties before creating it. Set the class property to TableLines and its border to 0. Enter the text Type:, Address:, and Notes: in the leftmost cells. 3. Drop a Label control and set its data binding expression as follows: DataBinder.Eval(Container, "DataItem.TypeName") 4. Add a TextBox control and set its properties as follows: ID: txtAddress CssClass: TextBox Rows: 3 TextMode: MultiLine Give the TextBox control the following data binding expression: DataBinder.Eval(Container, "DataItem.Address") 5. Add another TextBox control and set its properties as follows: ID: txtNotes CssClass: TextBox Rows: 3 TextMode: MultiLine Give the TextBox control the following data binding expression: DataBinder.Eval(Container, "DataItem.Notes") 6. Below the table, enter a carriage return, and then drop two ImageButton controls. Set the first control s properties as follows: ID: cmdUpdate CommandName: Update AlternateText: Save ImageUrl: Images/ok.gif 7. Set the second ImageButton control s properties as follows: ID: cmdCancel CommandName: Cancel AlternateText: Cancel ImageUrl: Images/cancel.gif
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CHAPTER 5 DATA BINDING
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8. Next to the top Panel control is an existing Label control with the Hidden class. You need to change a couple properties for it, but because of its style, you won t be able to select it in the Design view. Switch to HTML view and locate Label12 by using Edit Find and Replace Find (Ctrl+F). The label next to it is the one to modify. Set its ID to lblPlaceID, and modify the binding expression to this: DataBinder.Eval(Container, "DataItem.PlaceID") You will use the value bound to this label to determine the row that needs to be updated. 9. When you have finished adding the inner controls, you can safely remove the table width property value and let its size adjust to its content. Switching to the HTML view causes template editing to end, so you ll need to start it again for the Item Templates. After removing the table width value, select End Template Editing from the DataList context menu to return to the page Design view. 10. Now you need to add the appropriate event handlers to the code-behind page. First, let s deal with the ItemDataBound event, which is fired when an item is being bound to the template. You receive the current item in the argument to the event, and you want to show the Edit button only for users whose ID matches the current place s AdministratorID. Switch to the Code view, select the dlPlaces element from the leftmost drop-down list at the top of the window, and then select the ItemDataBound event from the rightmost drop-down list. In the new event handler, add the following code: Private Sub dlPlaces_ItemDataBound(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.DataListItemEventArgs) _ Handles dlPlaces.ItemDataBound ' Is the item selected If e.Item.ItemType = ListItemType.SelectedItem Then ' Locate the hidden Label containing the AdministratorID Dim admin As Label = _ CType(e.Item.FindControl("lblAdministratorID"), Label) ' If it matches the current user, show the Edit button If admin.Text = Page.User.Identity.Name Then e.Item.FindControl("cmdEdit").Visible = True End If End If End Sub 11. In all of the event handlers, you call BindPlaces() at the end, to re-create the controls in the DataList according to the last changes made. Whenever the Edit button is clicked, you ll also need to update the DataList s EditItemIndex, and set it to the ItemIndex of the item passed with the arguments to the event. Select the EditCommand event from the appropriate drop-down list in the code editor, and then add the following code to the method: Private Sub dlPlaces_EditCommand(ByVal source As Object, _ ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs) _ Handles dlPlaces.EditCommand
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