expand NestedViewTemplate using querystring

[tpowell]

I am using the radgrid to dispay quite a bit of data. To simplify the UI I have put the basic information into bound columns and given the user the option to expand each row using the nextviewtamplate to see a more detailed data much like this demo.

<telerik:RadGrid ID="grdTest" runat="server">
<mastertableview>
<Columns>
...columns generated here
</Columns>
<NestedViewTemplate>
...Detailed data form here
</NestedViewTemplate>
<mastertableview>
</telerik:RadGrid>

I am also referencing this data on other pages and am trying to put a link to this page with a query string parameter of what record to expand. However I cannot seem to find how to set the "expanded row" through the server side code.

Here is an example of what I am trying to do

protected void grdTest_ItemDataBound(object sender, GridItemEventArgs e)
        {
            if (e.Item.ItemType == GridItemType.Item || e.Item.ItemType == GridItemType.AlternatingItem)
            {
                if (!string.IsNullOrEmpty(Request.QueryString["id"]))
                {
                    string DBIndentity = DataBinder.Eval(e.Item.DataItem, "ID", string.Empty);
                    string QueryStringIdentity = Request.QueryString["id"];
                    if (DBIndentity == QueryStringIdentity)
                        e.Item.Expanded = true;
                }
            }
}

Thanks in advance

[Veli]

Hi tpowell,

Try using the PreRender event of the grid or the page instead:

protected void Page_PreRender(object sender, GridItemEventArgs e)
{
    if (!string.IsNullOrEmpty(Request.QueryString["id"]))
    {
        string QueryStringIdentity = Request.QueryString["id"];

        foreach (GridDataItem item in grdTest.MasterTableView.Items)
        {
            string DBIndentity = item.GetDataKeyValue("ID").ToString();
            if (DBIndentity == QueryStringIdentity)
                e.Item.Expanded = true;
        }
    }
}

Best wishes,
Veli
the Telerik team

[tpowell]

Thanks a ton, it worked like a charm.

I did have to make some modifications to your code but it works on the grid pre-render event, It however does not work on the page pre-render because the grid is not bound yet.

protected void grdTest_PreRender(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(Request.QueryString["id"]))
            {
                string QueryStringIdentity = Request.QueryString["id"];
                txtSearch.Text = grdTrainings.MasterTableView.Items.Count.ToString();

                foreach (GridDataItem item in grdTrainings.MasterTableView.Items)
                {
                    string DBIndentity = item.GetDataKeyValue("id").ToString();
                    if (DBIndentity == QueryStringIdentity)
                        item.Expanded = true;
                }
            }
        }