How do I get Gridview to render THEAD?

Question

How do I get the GridView control to render the tags? I know .UseAccessibleHeaders makes it p

Answer 1

You can also use jQuery to add it. This avoids the problem with TableRowSection.TableHeader where gets dropped on PostBack.

$('#myTableId').prepend($("<thead></thead>").append($(this).find("#myTableId tr:first")));

Answer 2

I use the following code to do this:

The if statements I added are important.

Otherwise (depending on how you render your grid) you'll throw exceptions like:

The table must contain row sections in order of header, body and then footer.

protected override void OnPreRender(EventArgs e)
{
    if ( (this.ShowHeader == true && this.Rows.Count > 0)
      || (this.ShowHeaderWhenEmpty == true))
    {
        //Force GridView to use <thead> instead of <tbody> - 11/03/2013 - MCR.
        this.HeaderRow.TableSection = TableRowSection.TableHeader;
    }
    if (this.ShowFooter == true && this.Rows.Count > 0)
    {
        //Force GridView to use <tfoot> instead of <tbody> - 11/03/2013 - MCR.
        this.FooterRow.TableSection = TableRowSection.TableFooter;
    }
    base.OnPreRender(e);
}

The this object is my GridView.

I actually overrode the Asp.net GridView to make my own custom control, but you could paste this into your aspx.cs page and reference the GridView by name instead of using the custom-gridview approach.

FYI: I haven't tested the footer logic, but I do know this works for Headers.

Answer 3

This works for me:

protected void GrdPagosRowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        e.Row.TableSection = TableRowSection.TableBody;
    }
    else if (e.Row.RowType == DataControlRowType.Header)
    {
        e.Row.TableSection = TableRowSection.TableHeader;
    }
    else if (e.Row.RowType == DataControlRowType.Footer)
    {
        e.Row.TableSection = TableRowSection.TableFooter;
    }
}

This was tried in VS2010.

Answer 4

I know this is old, but, here's an interpretation of MikeTeeVee's answer, for a standard gridview:

aspx page:

<asp:GridView ID="GridView1" runat="server" 
    OnPreRender="GridView_PreRender">

aspx.cs:

    protected void GridView_PreRender(object sender, EventArgs e)
    {
        GridView gv = (GridView)sender;

        if ((gv.ShowHeader == true && gv.Rows.Count > 0)
            || (gv.ShowHeaderWhenEmpty == true))
        {
            //Force GridView to use <thead> instead of <tbody> - 11/03/2013 - MCR.
            gv.HeaderRow.TableSection = TableRowSection.TableHeader;
        }
        if (gv.ShowFooter == true && gv.Rows.Count > 0)
        {
            //Force GridView to use <tfoot> instead of <tbody> - 11/03/2013 - MCR.
            gv.FooterRow.TableSection = TableRowSection.TableFooter;
        }

    }

Answer 5

The code in the answer needs to go on Page_Load or GridView_PreRender. I put it in a method that was called after Page_Load and got a NullReferenceException.

Answer 6

I use this in OnRowDataBound event:

protected void GridViewResults_OnRowDataBound(object sender, GridViewRowEventArgs e) {
    if (e.Row.RowType == DataControlRowType.Header) {
        e.Row.TableSection = TableRowSection.TableHeader;
    }
}