Telerik UI for ASP.NET AJAX

To simplify your code logic, you can specify certain columns whose values you want to access easily on the client. When you add the value of the DateField to the ClientDataKeyNames array of the MasterTableView or a detail GridTableView, RadGrid makes that column's value available through the getDataKeyValue() function of the GridDataItem client-side object and of the arguments for client-side event handlers that respond to item events.

To use getDataKeyValue(), pass the UniqueName of the column as an argument. This method returns the value of that column for the GridDataItem.

Caution

When getting a reference to a GridDataItem using the RadGrid client object's get_dataItems() method, be aware that this method creates the client-side objects for all rows in the grid. This can lead to a performance penalty if RadGrid displays too many items in one page.

CopyASPX
<script type="text/javascript">
    function RowSelected(sender, args) {
        var label = document.getElementById("<%= Label1.ClientID %>");
        label.innerHTML =
   "<b>CustomerID: </b>" +
   args.getDataKeyValue("CustomerID") +
   "<br />" + "<b>CompanyName: </b>" +
   args.getDataKeyValue("CompanyName");
    }

    function GetFirstDataItemKeyValues() {
        var firstDataItem = $find("<%=RadGrid1.ClientID %>").get_masterTableView().get_dataItems()[0];
        var keyValues =
   'CustomerID: "' +
    firstDataItem.getDataKeyValue("CustomerID") + '"' +
    ' \r\n' +
    'CompanyName: "' +
    firstDataItem.getDataKeyValue("CompanyName") + '"';
        alert(keyValues);
    }

</script>
<asp:Button ID="Button1" runat="server" Text="Get first GridDataItem key values"
  OnClientClick="GetFirstDataItemKeyValues(); return false;" /><br />
<br />
<telerik:RadGrid ID="RadGrid1" runat="server" DataSourceID="SqlDataSource" AllowPaging="true"
  PageSize="10" Width="97%" AllowSorting="true">
  <MasterTableView Width="100%" ClientDataKeyNames="CustomerID,CompanyName" />
  <ClientSettings>
    <Selecting AllowRowSelect="true" />
    <ClientEvents OnRowSelected="RowSelected" />
  </ClientSettings>
</telerik:RadGrid><br />
<br />
<asp:Label ID="Label1" runat="server" />
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
     SelectCommand="SELECT * FROM [Customers]">
</asp:SqlDataSource>

Another approach for fetching values from grid cells is to use the GetCellByColumnUniqueName(rowObject, columnName) method. Further information about that approach, see Getting cell values for selected rows client side.