You can use the jQuery based client-side API of jqGrid.NET to get/set selected rows on the client with javascript (no postback).

First, obtain a jQuery reference to the grid's client-side object using:

var grid = jQuery("#<%= JQGrid1.ClientID %>");

Note that in the jQuery selector, we are using the ClientID of the grid and not the hardcoded "JQGrid1" ID. The reason for that - ClientIDs change when grids are inside parent controls, like User Controls, Master Pages, etc. This is the reason we always need to use the ClientID.

Then, once you get the ID, you can perform a lot of operations against it, for example to select a row, just pass the row key

grid.setSelection('10249');

To get the selected row, you can use:

var rowKey = grid.getGridParam("selrow"); // returns null if no row is selected
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="default.aspx.cs" Inherits="GridTest.examples.selection.selectedrow_client._default" %>
<%@ Register Assembly="Trirand.Web" TagPrefix="trirand" Namespace="Trirand.Web.UI.WebControls" %>

<!DOCTYPE html>
<html lang="en-us">
<head id="Head1" runat="server">
    <meta charset="utf-8">
    <title>jqGrid for ASP.NET WebForms - selected row on the client-side</title>
    <!-- The jQuery UI theme that will be used by the grid -->
    <link rel="stylesheet" type="text/css" media="screen" href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.11.4/themes/redmond/jquery-ui.css" />
    <!-- The jQuery UI theme extension jqGrid needs -->
    <link rel="stylesheet" type="text/css" media="screen" href="/themes/ui.jqgrid.css" />
    <!-- jQuery runtime minified -->
    <script src="http://ajax.microsoft.com/ajax/jquery/jquery-2.2.0.min.js" type="text/javascript"></script>
    <!-- The localization file we need, English in this case -->
    <script src="/js/trirand/i18n/grid.locale-en.js" type="text/javascript"></script>
    <!-- The jqGrid client-side javascript -->
    <script src="/js/trirand/jquery.jqGrid.min.js" type="text/javascript"></script>    
        
    <style type="text/css">    
        body, html { font-size: 80%; }    
    </style>
    
    <script type="text/javascript">

        function getSelectedRow() {
            var grid = jQuery("#<%= JQGrid1.ClientID %>");
            var rowKey = grid.getGridParam("selrow");

            if (rowKey)
                alert("Selected row primary key is: " + rowKey);
            else
                alert("No rows are selected");
        }

        function selectSecondRow() {
            var grid = jQuery("#<%= JQGrid1.ClientID %>");
            grid.setSelection('10249');
        }
    
    </script>
</head>


<body>
    <form id="form1" runat="server">

    <asp:SqlDataSource runat="server" ID="SqlDataSource1" 
        ConnectionString="<%$ ConnectionStrings:SQL2008_449777_fhsConnectionString %>"                 
        SelectCommand="SELECT [OrderID], [RequiredDate], [ShipName], [ShipCity], [Freight] FROM [Orders]">
    </asp:SqlDataSource>        
        
    <trirand:JQGrid runat="server" ID="JQGrid1" DataSourceID="SqlDataSource1" Width="600px" >
        <Columns>
            <trirand:JQGridColumn DataField="OrderID" HeaderText="Order ID" PrimaryKey="True" Width="50" />
            <trirand:JQGridColumn DataField="RequiredDate" DataFormatString="{0:d}"/>
            <trirand:JQGridColumn DataField="ShipName" Width="200" />
            <trirand:JQGridColumn DataField="ShipCity" />
            <trirand:JQGridColumn DataField="Freight" />
        </Columns>
        <ToolBarSettings ShowRefreshButton="true" ShowSearchButton="true" />
    </trirand:JQGrid>
    
    <br /><br />

    <input type="button" value="Select row with ID 10249" onclick="selectSecondRow()" />&nbsp;
    <input type="button" value="Get Selected Row" onclick="getSelectedRow()" />&nbsp;   
    
    
    <br /><br />
    
    <trirand:codetabs runat="server" id="tabs"></trirand:codetabs>  
    
    </form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace GridTest.examples.selection.selectedrow_client
{
    public partial class _default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }
}
Switch theme:


Theming is based on the very popular jQuery ThemeRoller standard. This is the same theming mechanism used by jQuery UI and is now a de-facto standard for jQuery based components. The benefits of using ThemeRoller are huge. We can offer a big set of ready to use themes created by professional designers, including Windows-like themes (Redmond), Apple-like theme (Cupertino), etc. In addition to that any jQuery UI controls on the same page will pick the same theme.

Last, but not least, you can always roll your own ThemeRoller theme, using the superb Theme Editor

To use a theme, simply reference 2 Css files in your Html <head> section - the ThemeRoller theme you wish to use, and the jqGrid own ThemeRoller Css file. For example (Redmond theme):

<link rel="stylesheet" type="text/css" media="screen" href="/themes/redmond/jquery-ui-1.8.2.custom.css" />
<link rel="stylesheet" type="text/css" media="screen" href="/themes/ui.jqgrid.css" />