Setting row.Selected doesn't fire SelectedIndexChanged

[Mark]

Hi,

I am loading a grid with data and attaching to the SelectedIndexChanged event. When the grid is loaded I want to select the first row and have the code in the SelectedIndexChanged handler run. The only way I can manage this is to explicitly call the handler.

My C# code is as follows:

protected void grdTicket_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
{
    DataSet ds = new DataSet();
    DataTable dt = new DataTable();
    dt.Columns.Add("UserId");

    for (int i = 0; i < 15; i++)
    {
        DataRow dr = dt.NewRow();
        dr["UserId"] = "XYZ" + i.ToString();
        dt.Rows.Add(dr);
    }

    ds.Tables.Add(dt);
    grdTicket.DataSource = ds;
}

protected void grdTicket_PreRender(object sender, EventArgs e)
{
    RadGrid grid = sender as RadGrid;

    if (grid.MasterTableView.Items.Count > 0)
    {
        if (grid.SelectedIndexes.Count == 0)
        {
            //grid.SelectedIndexes.Add(0);
            grid.MasterTableView.Items[0].Selected = true;

            // This just feels dirty!!
            // Why doesn't the event fire when I set the row's Selected property
            grdTicket_SelectedIndexChanged(sender, null);
        }
    }
}

protected void grdTicket_SelectedIndexChanged(object sender, EventArgs e)
{
    RadGrid grid = sender as RadGrid;
    int index = Convert.ToInt32(grid.SelectedIndexes[0]);
    lblSelectedIndex.Text = "Selected index = " + index;
}

and my HTML is:

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<telerik:RadGrid ID="grdTicket" runat="server" AutoGenerateColumns="false" Width="946px"
    Font-Names="Verdana" Font-Size="x-small" EnableViewState="true" AllowSorting="true"
    AllowPaging="true" AllowMultiRowSelection="false" OnNeedDataSource="grdTicket_NeedDataSource"
    OnPreRender="grdTicket_PreRender" OnSelectedIndexChanged="grdTicket_SelectedIndexChanged">
    <ClientSettings EnablePostBackOnRowClick="True">
        <Selecting AllowRowSelect="True" />
    </ClientSettings>
    <MasterTableView Width="100%" NoDetailRecordsText="No Records To Display">
        <CommandItemSettings ExportToPdfText="Export to PDF"></CommandItemSettings>
        <RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">
        </RowIndicatorColumn>
        <ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">
        </ExpandCollapseColumn>
        <Columns>
            <telerik:GridBoundColumn HeaderText="User ID" DataField="UserId" UniqueName="UserID">
            </telerik:GridBoundColumn>
        </Columns>
        <EditFormSettings>
            <EditColumn FilterControlAltText="Filter EditCommandColumn column">
            </EditColumn>
        </EditFormSettings>
    </MasterTableView>
    <PagerStyle Mode="NextPrevNumericAndAdvanced" ShowPagerText="true" />
    <FilterMenu EnableImageSprites="False">
    </FilterMenu>
    <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Default">
    </HeaderContextMenu>
</telerik:RadGrid>
<br />
<asp:Label runat="server" ID="lblSelectedIndex" />

Can anyone tell me what I need to change to get this to work without the need to call the handler directly?

Thanks,

David

[Martin]

Hello Mark,

You have to fire the "Select" command in order to make SelectedIndexChanged event handler to be called:

protected void grdTicket_PreRender(object sender, EventArgs e)
{
    RadGrid grid = sender as RadGrid;

    if (grid.MasterTableView.Items.Count > 0)
    {
        if (grid.SelectedIndexes.Count == 0)
        {
            (grid.MasterTableView.Items[0] as GridDataItem).FireCommandEvent("Select", String.Empty);
            //grid.SelectedIndexes.Add(0);
            //grid.MasterTableView.Items[0].Selected = true;

            // This just feels dirty!!
            // Why doesn't the event fire when I set the row's Selected property
            //grdTicket_SelectedIndexChanged(sender, null);
        }
    }
}

More information about how to fire commands from code is available at:

How to fire command events from code

I hope this helps.

All the best,
Martin
the Telerik team

[Mark]

Thanks very much Martin, that did the job.