How to implement cascaded combo box columns in ASPxGridView without using templates

Question Comments

I looked at the code below and it looks like what I have.  The page just never gets to it.  Here is the complete asp page:

<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="mnt_Person.aspx.vb" Inherits="mnt_Person" %>

<%@ Register assembly="DevExpress.Web.v13.2, Version=13.2.6.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxGridView" tagprefix="dx" %>
<%@ Register assembly="DevExpress.Web.v13.2, Version=13.2.6.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxEditors" tagprefix="dx" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
  <script type="text/javascript">
   // <![CDATA[
      var lastServiceDivNo = null;
      function OnServiceDivNoChanged(cmbServiceDivisionNm) {
          if (grid.GetEditor("ServiceAreaNm").InCallback())
              lastServiceDivNo = cmbServiceDivisionNm.GetValue().toString();
          else
              grid.GetEditor("ServiceAreaNm").PerformCallback(cmbServiceDivisionNm.GetValue().toString());
      }
      function OnEndCallback(s, e) {
          if (lastServiceDivNo) {
              grid.GetEditor("ServiceAreaNm").PerformCallback(lastServiceDivNo);
              lastServiceDivNo = null;
          }
      }
   // ]]>
   </script>
   <asp:Label ID="Label2" runat="server" CssClass="pageheader" Width="100%" Text="Supervisor Maintenance"></asp:Label>
   <br />
   <dx:ASPxGridView ID="grid" ClientInstanceName="grid" runat="server" AutoGenerateColumns="False"
       DataSourceID="SqlDataSource1" KeyFieldName="Person_Key">
       <Columns>
          <dx:GridViewCommandColumn ShowClearFilterButton="True" ShowNewButton="True"
               VisibleIndex="1">
           </dx:GridViewCommandColumn>
           <dx:GridViewDataTextColumn FieldName="Person_Key" VisibleIndex="2">
               <EditFormSettings Visible="False" />
           </dx:GridViewDataTextColumn>
           <dx:GridViewDataTextColumn FieldName="Supervisor_No" VisibleIndex="3">
           </dx:GridViewDataTextColumn>
           <dx:GridViewDataComboBoxColumn FieldName="ServiceDivisionNm" VisibleIndex="4">
               <PropertiesComboBox DataSourceID="SqlDataSource2" TextField="ServiceDivisionNm" EnableSynchronization="False"
                   ValueField="ServiceDivisionNo">
                    <ClientSideEvents SelectedIndexChanged="function(s, e) {OnServiceDivNoChanged(s); }"></ClientSideEvents>
                </PropertiesComboBox>
           </dx:GridViewDataComboBoxColumn>
           <dx:GridViewDataComboBoxColumn FieldName="ServiceAreaNm" VisibleIndex="5">
               <PropertiesComboBox EnableSynchronization="False">
               <ClientSideEvents EndCallback="OnEndCallback"></ClientSideEvents>
               </PropertiesComboBox>
           </dx:GridViewDataComboBoxColumn>
                       <dx:GridViewDataTextColumn FieldName="TransNoPrefix" VisibleIndex="8">
           </dx:GridViewDataTextColumn>
           <dx:GridViewDataTextColumn FieldName="Supervisor" VisibleIndex="9">
           </dx:GridViewDataTextColumn>
           <dx:GridViewDataCheckColumn FieldName="IsActive" VisibleIndex="10">
           </dx:GridViewDataCheckColumn>
       </Columns>
       <SettingsEditing Mode="Batch">
       </SettingsEditing>
       <Settings ShowFilterRow="True" />
       <SettingsCommandButton>
           <ClearFilterButton Text="Clear">
           </ClearFilterButton>
       </SettingsCommandButton>
       <SettingsDataSecurity AllowDelete="False" />
   </dx:ASPxGridView>
   

   <asp:SqlDataSource ID="SqlDataSource2" runat="server"
       ConnectionString="<%$ ConnectionStrings:CCFieldServiceConnectionString %>"
       SelectCommand="SELECT distinct [ServiceDivisionNo], [ServiceDivisionNm] FROM [dim_Organization]">
   </asp:SqlDataSource>
   
   <asp:SqlDataSource ID="SqlDataSource3" runat="server" ConnectionString="<%$ ConnectionStrings:CCFieldServiceConnectionString %>"
       SelectCommand="SELECT distinct [ServiceAreaNo], [ServiceAreaNm] FROM [dim_Organization] WHERE ServiceDivisionNo = ? ">
       <SelectParameters>
           <asp:Parameter Name="?" />
       </SelectParameters>
   </asp:SqlDataSource>

   <asp:SqlDataSource ID="SqlDataSource1" runat="server"
       ConnectionString="<%$ ConnectionStrings:CCFieldServiceConnectionString %>"
       
       SelectCommand="SELECT dbo.dim_Person.Person_Key, dbo.dim_Person.Supervisor_No, dbo.dim_Person.TransNoPrefix, dbo.dim_Person.Supervisor, dbo.dim_Person.IsActive, dbo.dim_Organization.ServiceAreaNm, dbo.dim_Organization.ServiceDivisionNm FROM dbo.dim_Person INNER JOIN dbo.dim_Organization ON dbo.dim_Person.ServiceDivisionNo = dbo.dim_Organization.ServiceDivisionNo AND dbo.dim_Person.ServiceAreaNo = dbo.dim_Organization.ServiceAreaNo WHERE (dbo.dim_Person.IsActive = 1)">
     
   </asp:SqlDataSource>
   

</asp:Content>

So, I have created a separate ticket on your behalf to process your inquiry more effectively:

How to implement cascaded combo box columns in ASPxGridView without using templates

Please refer to it for further correspondence.

I don't understand how this code work for new rows if in the grid_celleditorinitialize sub, if checks If (Not grid.IsNewRowEditing) Then before getting the filter value, so how does the second combo prefill for new rows after country is selected?

Please explain,