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Data-Bound Controls
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The newly created Label control has font and text adequately set to generate a glyph (typically and ) that indicates the direction of the sorting. You must add it alongside the header text of the clicked column. The index of the column can be stored to the view state during the Sorting event. Alternatively, it can simply be retrieved, comparing the current sort expression the grid s SortExpression property to the column s sort expression. Once you know the index of the column, you retrieve the corresponding table cells and add the Label:
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item.Cells[i].Controls.Add (glyph);
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The results are shown in Figure 7-9. If your page is based on a theme, the font of the Label control essential for rendering the glyph correctly might be overridden. To avoid that, you should disable theming support for the label control. The EnableTheming property does just that.
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Figure 7-9 Enhancing the sorting capabilities of the GridView control
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One more item worth mentioning about sorting on a GridView control is that you can cancel the sorting operation if need be. You write a handler for the Sorting event, get the event argument data (an object of type GridViewSortEventArgs), and set its Cancel property to true. The following code snippet shows how to cancel sorting if the grid is in edit mode:
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void MyGridView_Sorting(object sender, GridViewSortEventArgs e) { if (e.EditIndex > -1) { e.Cancel = true; }
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C07620245.fm Page 224 Tuesday, June 8, 2004 6:23 PM
Part II
Data Access
As you can see, Figure 7-9 contains a check box to enable callbacks. When that check box is selected, the Boolean EnablePagingAndSortingCallbacks property on the GridView is set to true. As a result, sorting and paging operations take place without refreshing the whole page. In other words, the page doesn t post back as a whole, but issues an out-of-band call to retrieve the new records to display. When the records are downloaded completely, an internal script callback function is invoked to update the user interface through Dynamic HTML. This feature requires Internet Explorer 5.5 or later.
Note
Paging Data
The ability to scroll a potentially large set of data is an important but challenging feature for modern, distributed applications. An effective paging mechanism allows customers to interact with a database without holding resources. Like the DataGrid, the GridView control provides a built-in mechanism for paging over the supplied data source. This form of paging requires that the whole data source be bound to the control. In other words, the GridView gets the whole result set from the data source object, caches it internally, and then pages through it. To enable paging, all you do is enable paging capabilities on the control. The property to use is AllowPaging. The following code extends the previous page to support paging:
<asp:gridview runat="server id="MyGridView datasourceid="MySource autogeneratecolumns="false" allowpaging="true allowsorting="true onrowcreated="MyGridView_RowCreated > <pagersettings firstpagetext="7 lastpagetext="8 nextpagetext="4 prevpagetext="3 mode="NextPrevFirstLast /> <pagerstyle font-name="webdings /> <columnfields> <asp:boundfield datafield="productname headertext="Product sortexpression="productname /> <asp:boundfield datafield="quantityperunit headertext="Packaging /> </columnfields> </asp:gridview>
When the AllowPaging property is set to true, the grid displays a pager bar. You can control the characteristics of the pager to a large extent through the <PagerSettings> and <PagerStyle> tags or their equivalent properties. Unlike the DataGrid, the GridView pager supports first and last page buttons and lets
C07620245.fm Page 225 Tuesday, June 8, 2004 6:23 PM
7
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you assign an image to each button. (This is also possible in version 1.x, but it requires a lot of code.) The pager can work in either of two modes displaying explicit page numbers or providing a relative navigation system. In the former case, the pager contains numeric links, one representing a page index. In the latter case, buttons are present to navigate to the next or previous page and even to the first or the last. Ad hoc properties NextPageText and PreviousPageText let you set the labels for these buttons as desired. Figure 7-10 shows the page in action.
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