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Dynamic dropdwonlist in edit form template

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UI for ASP.NET AJAX in ASP.NET MVC
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Reginald Ware
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Reginald Ware asked on 04 May 2010, 06:33 PM
Hello,

I have a code like this:
         <telerik:RadGrid runat="server" ID="RadGrid1" Skin="WebBlue" PagerStyle-AlwaysVisible="true" GridLines="Horizontal" AutoGenerateColumns="true" OnNeedDataSource="RadGrid1_NeedDataSource"  AllowAutomaticInserts="True" AllowAutomaticUpdates="True" OnUpdateCommand="RadGrid1_UpdateCommand" AllowPaging="true" PageSize="20" OnItemDataBound="RadGrid1_ItemDataBound1"
                <MasterTableView AutoGenerateColumns="false" DataKeyNames="DoctorId" > 
                <Columns> 
                    <telerik:GridBoundColumn  HeaderText="DoctorId" DataField="DoctorId" UniqueName="DoctorId" Visible="false" /> 
                    <telerik:GridBoundColumn  HeaderText="Name" DataField="DoctorName" UniqueName="Name" /> 
                    <telerik:GridBoundColumn  HeaderText="Category" DataField="Category" UniqueName="Category" /> 
                    <telerik:GridEditCommandColumn UniqueName="EditCommandColumn" /> 
                </Columns> 
                <EditFormSettings EditFormType="Template"
                <FormTemplate> 
                    <table> 
                         
                        <tr> 
                            <td><h3>Doctor Details:</h3></td
                        </tr> 
                        <tr> 
                           <td>Name:</td> 
                           <td><asp:TextBox ID="txtDoctorname" runat="server" Text = '<%# Eval("DoctorName") %>'></asp:TextBox></td
                           <td>Category:</td> 
                           <td> 
                                <asp:DropDownList ID="drpCategory" runat="server"
                                    <asp:ListItem Text="Physician" Value="23" Selected="True"></asp:ListItem> 
                                    <asp:ListItem Text="Dentist" Value="14"></asp:ListItem> 
                                    <asp:ListItem Text="Alt Medicine" Value="22"></asp:ListItem> 
                                </asp:DropDownList> 
                                 
                           </td> 
                              <td>Profile type:</td> 
                           <td> 
                                <asp:DropDownList ID="drpProfile" runat="server"
                                     
                                </asp:DropDownList> 
                                 
                           </td> 
                        </tr> 
                    </table> 
                 
                </FormTemplate> 
                 
                </EditFormSettings> 
                 
            </MasterTableView> 
            </telerik:RadGrid>  

How do I generate second drop down list "drpProfile" dynamically in code behind  based on selected value of "drpCategory" list?
Please, help.

Thanks,

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Radoslav
Telerik team
answered on 10 May 2010, 01:08 PM
Hello Reginald,

To achieve the desired functionality you could try ajaxifying the RadGrid:
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="RadGrid1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadGrid1" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManager>

Then on drpCategory.SelectedIndexChanged event handler you could get the selected value and based on it to populate the drpProfile DropDownList:
protected void drpCategory_SelectedIndexChanged(object sender, EventArgs e)
{
        DropDownList drpCategory = (sender as DropDownList);
        DropDownList drpProfile = ((sender as DropDownList).NamingContainer as GridEditFormItem).FindControl("drpProfile") as DropDownList;
        drpProfile.DataTextField = "TextField";
        drpProfile.DataValueField = "ValueField";
 
        switch (Convert.ToInt32(drpCategory.SelectedValue))
        {
            case 23:
                {
...
                    drpProfile.DataSource = data;
                }
                break;
            case 22:
                {
                    ...
                }
                break;
            case 14:
                {
...
                }
                break;
            default:
                break;
        }
        drpProfile.DataBind();
}

Additionally I am sending you a simple example which demonstrates the desired functionality. Please check it out and let me know if it helps you.

Kind regards,
Radoslav
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UI for ASP.NET AJAX in ASP.NET MVC
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Reginald Ware
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Answers by
Radoslav
Telerik team
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