Checkbox as header in GridItemTemplate

[kmccusker]

Hi!

I could use some assistance if anyone is able to help. In my application I have a grid displaying a number of columns. There is a requirement for the users to be able to select any number of columns and then export the selected columns to PDF or Excel. To enable selection of columns, I added a checkbox into the HeaderTemplate of a GridItemTemplateColumn for each column.

By the way, the code displayed in this is a simplified version I created in an attempt to identify the issue. :)

Here is the markup for my RadGrid

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false">
      <MasterTableView>
          <Columns>
              <telerik:GridTemplateColumn UniqueName="ID"
                  AllowFiltering="true"
                  HeaderStyle-Width="100"
                  SortExpression="ID"
                  FilterControlWidth="50"
                  HeaderText="ID">
                  <HeaderTemplate>
                      <asp:CheckBox ID="IDCheck" runat="server" CssClass="HeaderCheckBox" Text="ID" />
                  </HeaderTemplate>
                  <ItemTemplate>
                      <asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>'></asp:Label>
                  </ItemTemplate>
              </telerik:GridTemplateColumn>
              <telerik:GridTemplateColumn UniqueName="Name"
                  AllowFiltering="true"
                  HeaderStyle-Width="100"
                  SortExpression="ID"
                  FilterControlWidth="50"
                  HeaderText="Name">
                  <HeaderTemplate>
                      <asp:CheckBox ID="NameCheck" runat="server" CssClass="HeaderCheckBox" Text="Name" />
                  </HeaderTemplate>
                  <ItemTemplate>
                      <asp:Label ID="NameLabel" runat="server" Text='<%# Eval("Name") %>'></asp:Label>
                  </ItemTemplate>
              </telerik:GridTemplateColumn>
              <telerik:GridTemplateColumn UniqueName="RandomText"
                  AllowFiltering="true"
                  HeaderStyle-Width="100"
                  SortExpression="RandomText"
                  FilterControlWidth="50"
                  HeaderText="RandomText">
                  <HeaderTemplate>
                      <asp:CheckBox ID="RandomTextCheck" runat="server" CssClass="HeaderCheckBox" Text="Random" />
                  </HeaderTemplate>
                  <ItemTemplate>
                      <asp:Label ID="RandomTextLabel" runat="server" Text='<%# Eval("RandomText") %>'></asp:Label>
                  </ItemTemplate>
              </telerik:GridTemplateColumn>
          </Columns>
      </MasterTableView>
  </telerik:RadGrid>
  <asp:Button ID="PDFExportButton" runat="server" OnClick="ExportToPDF" Text="Export to PDF" />
  <asp:Button ID="ExcelExportButton" runat="server" OnClick="ExportToExcel" Text="Export to Excel" />

And here is the code behind:

public partial class Default : System.Web.UI.Page
{
    protected override void OnInit(EventArgs e)
    {
        RadGrid1.DataSource = GetDataSource();
        RadGrid1.DataBind();

        base.OnInit(e);
    }

    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected List<Person> GetDataSource()
    {
        List<Person> peeps = new List<Person>();

        for (int i = 0; i < 10; i++)
        {
            Person p = new Person
            {
                Name = "Test" + i.ToString(),
                ID = i,
                RandomText = DateTime.Now.Millisecond.ToString()
            };

            peeps.Add(p);
        }

        return peeps;
    }

    protected void ExportToPDF(object sender, EventArgs e)
    {
        RadGrid1.ExportSettings.ExportOnlyData = true;
        RadGrid1.ExportSettings.HideStructureColumns = true;
        RadGrid1.ExportSettings.IgnorePaging = true;
        //RadGrid1.ExportSettings.OpenInNewWindow = true;
        RadGrid1.MasterTableView.ExportToPdf();
    }

    protected void ExportToExcel(object sender, EventArgs e)
    {
        RadGrid1.ExportSettings.ExportOnlyData = true;
        RadGrid1.ExportSettings.HideStructureColumns = true;
        RadGrid1.ExportSettings.IgnorePaging = true;
        //RadGrid1.ExportSettings.OpenInNewWindow = true;
        RadGrid1.MasterTableView.ExportToExcel();
    }
}

The issue I am having is that when the columns are exported instead of the HeaderText being displayed, "False" is displayed. I've attached a screenshot of the PDF output.

To sum it up: I want the column's header text to display in the exported files instead of the text "False", but I can't figure out what I am doing wrong or if there is a better way to achieve this.

Thanks.
Kevin

[Princy]

Hello,

I think the best way for this scenario would be to create a hidden GridTemplateColumn that you make visible when exporting. Please try this approach.
aspx:

<telerik:GridTemplateColumn UniqueName="ID" AllowFiltering="true" HeaderStyle-Width="100" SortExpression="FirstName" FilterControlWidth="50" HeaderText="ID">
  <HeaderTemplate>
     <asp:CheckBox ID="IDCheck" runat="server" CssClass="HeaderCheckBox" />
  </HeaderTemplate>
  <ItemTemplate>
      <asp:Label ID="IDLabel" runat="server" Text='<%# Eval("ID") %>'></asp:Label>
  </ItemTemplate>
</telerik:GridTemplateColumn>
<telerik:GridTemplateColumn UniqueName="IDForExport" AllowFiltering="true" HeaderStyle-Width="100" SortExpression="FirstName" FilterControlWidth="50" HeaderText="ID" Visible="false">
   <ItemTemplate>
      <asp:Label ID="IDLabelForExport" runat="server" Text='<%# Eval("ID") %>'></asp:Label>
   </ItemTemplate>
</telerik:GridTemplateColumn>

C#:

protected void ExportToExcel(object sender, EventArgs e)
{
  RadGrid1.ExportSettings.ExportOnlyData = true;
  RadGrid1.ExportSettings.IgnorePaging = true;
  (RadGrid1.MasterTableView.GetColumn("IDForExport") as GridTemplateColumn).Visible = true;
  (RadGrid1.MasterTableView.GetColumn("ID") as GridTemplateColumn).Visible = false;
   RadGrid1.MasterTableView.ExportToExcel();
}

I hope that helps.

Thanks,
Princy.

[kmccusker]

Thank you for the response. I'll test it out and let you know how it goes!

EDIT: Thanks again Princy! That worked out just fine. If you ever find yourself in Phoenix, AZ send me a message and I'll buy you a beverage of your choice. :)