Grid View for ASP.NET Web Forms - Select detail rows on master row selection

This example demonstrates how to select or deselect rows in a detail grid when master row selection changes.

Overview

Follow the steps below to implement master-detail functionality and select or deselect detail rows based on the master row's selection state:

1. Create a master grid control, set the ShowDetailRow property to true, specify the grid's Templates.DetailRow property, and add a detail grid to the template. For both grid controls, set the ShowSelectCheckbox property to true to enable selection.

   <dx:ASPxGridView ID="master" runat="server" ...>
       <SettingsDetail ShowDetailRow="True" />
       <ClientSideEvents SelectionChanged="onMasterGridSelectionChanged" />
       <Columns>
           <dx:GridViewCommandColumn ShowSelectCheckbox="true" VisibleIndex="0" />
           <!-- ... -->
       </Columns>
       <Templates>
           <DetailRow>
               <dx:ASPxGridView ID="detail" runat="server" ...>
                   <Columns>
                       <dx:GridViewCommandColumn ShowSelectCheckbox="true" VisibleIndex="0" />
                       <!-- ... -->
                   </Columns>
               </dx:ASPxGridView>
           </DetailRow>
       </Templates>
   </dx:ASPxGridView>

2. Handle the master grid's client-side SelectionChanged event. In the handler, send a callback to the server and pass the master row's visible index and the row's selection state as parameters.

   function onMasterGridSelectionChanged(s, e) {
       master.PerformCallback("select|" + e.visibleIndex + "|" + (e.isSelected ? "T" : ""));
   }

3. Handle the master grid's server-side CustomCallback event. In the handler, do the following:

   • Call the master grid's FindDetailRowTemplateControl method to access the detail grid.
   • Call the detail grid's SelectAll or UnselectAll method to select or deselect detail grid rows based on the master row's selection state.

   protected void master_CustomCallback(object sender, ASPxGridViewCustomCallbackEventArgs e) {		
   	string[] data = e.Parameters.Split('|');
   	if(data.Length == 3 && data[0] == "select")
   		ProcessDetailSelection(int.Parse(data[1]), data[2] == "T");		
   }
   
   void ProcessDetailSelection(int index, bool state) {
   	ASPxGridView detail = master.FindDetailRowTemplateControl(index, "detail") as ASPxGridView;
   	if(detail != null) {
   		if(state)
   			detail.Selection.SelectAll();
   		else
   			detail.Selection.UnselectAll();
   	}
   }

Files to Review

• Default.aspx (VB: Default.aspx)
• Default.aspx.cs (VB: Default.aspx.vb)

Documentation

• Master-Detail Relationship
• Grid Selection
• Grid View Templates

More Examples

• Grid View for ASP.NET Web Forms - Simple master-detail implementation
• Grid View for ASP.NET Web Forms - How to update master and detail grids simultaneously in batch edit mode
• Grid View for ASP.NET Web Forms - How to refresh a master grid on a detail grid callback

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