Problem empty data check validation of rad listbox...

[Nikunj]

Design Source Code:
 <telerik:RadGrid ID="radgridencounterdtls" runat="server" AutoGenerateColumns="false"
            AllowPaging="true" PageSize="5" Skin="Default" GridLines="None" CellPadding="0"
            CellSpacing="0"
               PagerStyle-AlwaysVisible="true"
                OnItemDataBound="radgridencounterdtls_ItemDataBound"
              onupdatecommand="radgridencounterdtls_UpdateCommand"
              onneeddatasource="radgridencounterdtls_NeedDataSource"
              onitemcommand="radgridencounterdtls_ItemCommand">
            <MasterTableView DataKeyNames="ID,Tabs,Tabsname">
                <CommandItemSettings ExportToPdfText="Export to Pdf"></CommandItemSettings>
                <RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">
                    <HeaderStyle Width="20px"></HeaderStyle>
                </RowIndicatorColumn>
                <ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">
                    <HeaderStyle Width="20px"></HeaderStyle>
                </ExpandCollapseColumn>
                <Columns>
                 <telerik:GridTemplateColumn HeaderText="Template Name"  UniqueName="TemplateName"  >
                        <ItemTemplate>
                            <asp:Label ID="lblTemplateTypeid" runat="server" Text='<%# Eval("TemplateName") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                        <asp:Label ID="lbleditTemplateTypeid" runat="server" Text='<%# Eval("TemplateName") %>'></asp:Label>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                 <telerik:GridTemplateColumn HeaderText="Role" UniqueName="RoleName"  >
                        <ItemTemplate>
                            <asp:Label ID="lblRoleID" runat="server" Text='<%# Eval("RoleName") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                         <asp:Label ID="lbleditRoleID" runat="server" Text='<%# Eval("RoleName") %>'></asp:Label>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                 <telerik:GridTemplateColumn HeaderText="Location"  UniqueName="Locationname"   >
                        <ItemTemplate>
                            <asp:Label ID="lblLocationID" runat="server" Text='<%# Eval("Locationname") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                        <asp:Label ID="lbleditLocationID" runat="server" Text='<%# Eval("Locationname") %>'></asp:Label>
                        </EditItemTemplate>
                </telerik:GridTemplateColumn>
                 <telerik:GridTemplateColumn HeaderText="Department"  UniqueName="DepartmentName">
                        <ItemTemplate>
                            <asp:Label ID="lbldepartmentId" runat="server" Text='<%# Eval("DepartmentName") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                          <asp:Label ID="lbleditdepartmentId" runat="server" Text='<%# Eval("DepartmentName") %>'></asp:Label>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                 <telerik:GridTemplateColumn HeaderText="Physician" UniqueName="PhysicianName" >
                        <ItemTemplate>
                            <asp:Label ID="lblPhysicianID" runat="server" Text='<%# Eval("PhysicianName") %>'></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                         <asp:Label ID="lbleditPhysicianID" runat="server" Text='<%# Eval("PhysicianName") %>'></asp:Label>
                       
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                 <telerik:GridTemplateColumn HeaderText="Tabs" UniqueName="Tabsname" HeaderStyle-HorizontalAlign="Left"  EditFormColumnIndex="4"   HeaderStyle-VerticalAlign="Top" >
                        <ItemTemplate>
                            <asp:Label ID="lblTabs" runat="server" Text='<%# Eval("Tabsname") %>' Font-Bold="false" Font-Size="Smaller" Width="200"></asp:Label>
                        </ItemTemplate>
                        <EditItemTemplate>
                        <div>
                          <span style="float:left;"><telerik:RadListBox ID="rdlistbxEditEnctr" runat="server" Height="150px" SelectionMode="Multiple"  Width="230px" TransferMode="Copy"                                  AllowTransfer="true" TransferToID="rdlistbxEditselectedEnctr" EmptyMessage="No Record Found" CausesValidation="false" >
                         </telerik:RadListBox></span>
                         <span style="float:left;">
                         <telerik:RadListBox ID="rdlistbxEditselectedEnctr" runat="server" AllowReorder="true"
                               EmptyMessage="No Record Selected"
                              Height="150px"  Width="200px"  SelectionMode="Multiple"  CausesValidation="true"  >
                        </telerik:RadListBox>
                      <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="*Required"
ClientValidationFunction = "ValidateListBox" ValidationGroup="editenctr" >*Required</asp:CustomValidator>
 
                        </span>      
                          
                        </div>
                        </EditItemTemplate>
                    </telerik:GridTemplateColumn>
                 <telerik:GridTemplateColumn>
                        <ItemTemplate>
                          <div style="color:#E75B18;"><span>
                              <asp:LinkButton ID="lnkbtnedit" CommandArgument='<%# Eval("ID") %>' ForeColor="#E75B18" CommandName="Edit" runat="server">Edit</asp:LinkButton>/   <asp:LinkButton ID="lnkbtndelete" runat="server" CommandArgument='<%# Eval("ID") %>'  ForeColor="#E75B18" CommandName="delete"  OnClientClick="return delete_click();" Text="Delete"></asp:LinkButton>  </span></div>
                        </ItemTemplate>
                    </telerik:GridTemplateColumn>
                </Columns>
                <EditFormSettings ColumnNumber="6"  EditColumn-HeaderStyle-ForeColor="#E75B18"    >
                    <FormCaptionStyle   ForeColor="#E75B18"  HorizontalAlign="Left" />
                </EditFormSettings>
            </MasterTableView>
            <FilterMenu EnableImageSprites="False">
            </FilterMenu>
            <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Web20">
            </HeaderContextMenu>
            <ValidationSettings CommandsToValidate="Update" EnableValidation="true" ValidationGroup="editenctr" />
        </telerik:RadGrid>

Javascript code:
 function ValidateListBox(sender, args) {
             var gridvw = document.getElementById("<%=radgridencounterdtls.ClientID%>");
       
          var options = gridvw.getElementsByTagName("select");
         if (options.length > 0) {
              args.IsValid = true;
        }
        else {
           args.IsValid = false;
         }      

Hi, I am facing  a problem to check empty radlist box in radgrid edititem template using custom validation. I have used above  javascript code and have validation is working properly...i have mentioned  radlistbox and its related custom validator  above context ("rdlistbxEditselectedEnctr " & "CustomValidator")

[Genady Sergeev]

Hi Michael,

<telerik:RadListBox runat="server" ID="RadListBox1" AllowTransfer="true" TransferToID="RadListBox2">
                              <Items>
                                  <telerik:RadListBoxItem Text="Item1" />
                                  <telerik:RadListBoxItem Text="Item2" />
                                  <telerik:RadListBoxItem Text="Item3" />
                              </Items>
                          </telerik:RadListBox>

                          <telerik:RadListBox runat="server" ID="RadListBox2">
                              <Items>
                              </Items>
                          </telerik:RadListBox>

                          <asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator" ControlToValidate="RadListBox1"
                              ErrorMessage="ErrorMessage">
                          </asp:RequiredFieldValidator>

RadListBox is not rendered in the browser as a Select element, so you cannot find it using getElementByTagName. I suggest that you use RequiredFieldValidator instead of CustomValidator like this:




Regards,
Genady Sergeev
the Telerik team