This is a special paging mode of jqGrid where standard paging is disabled and you can request new pages by scrolling the scrollbar to the bottom. This is very convenient for getting large amounts of data page by page while keeping the interface simple.

In order to use this mode, just set the PagerSettings.ScrollBarPaging to true. PagerSettings.PageSize is still active (controls the amount of rows retrieved).

You can see the this is optimized for performance - we can page with scrollbar 1,000,000 records with fast response times.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="default.aspx.cs" Inherits="JQSuiteASPNETExample.examples.paging.scrollbar._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 - paging with scrollbar</title>
    <!-- The jQuery UI theme that will be used by the grid -->
    <link rel="stylesheet" type="text/css" media="screen" href="http://code.jquery.com/ui/1.12.1/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="/js/jquery-3.2.1.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>
</head>


<body>
    <form id="form1" runat="server">
     
        
    <trirand:JQGrid runat="server" ID="JQGrid1" Width="600px" Height="300px" OnDataRequesting="JQGrid1_DataRequesting">
        <Columns>
            <trirand:JQGridColumn DataField="OrderID" HeaderText="Order ID" PrimaryKey="True" Width="50" />
            <trirand:JQGridColumn DataField="CustomerID" />
            <trirand:JQGridColumn DataField="OrderDate" DataFormatString="{0:d}"/>            
            <trirand:JQGridColumn DataField="ShipName" Width="200" />
            <trirand:JQGridColumn DataField="Freight" />            
        </Columns>
        <PagerSettings ScrollBarPaging="true" PageSize="100" NoRowsMessage="Scroll to bottom to retrieve new page" />
    </trirand:JQGrid>
    
    <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;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace JQSuiteASPNETExample.examples.paging.scrollbar
{
    public partial class _default : System.Web.UI.Page
    {
        protected void JQGrid1_DataRequesting(object sender, Trirand.Web.UI.WebControls.JQGridDataRequestEventArgs e)
        {
            string orderByColumn;
            if (!String.IsNullOrEmpty(e.SortExpression))
                orderByColumn = e.SortExpression + " " + e.SortDirection.ToString();
            else
                orderByColumn = "OrderID ASC";
            e.TotalRows = GetRowCount(orderByColumn, e.SearchExpression);

            DataTable dt = GetData(JQGrid1.PagerSettings.PageSize,
                                    (e.NewPageIndex - 1) * JQGrid1.PagerSettings.PageSize,
                                    orderByColumn,
                                    e.SearchExpression);

            JQGrid1.DataSource = dt;
            JQGrid1.DataBind();
        }

        protected DataTable GetData(int pageSize, int startIndex, string orderByColumn, string searchExpression)
        {
            // Create a new Sql Connection and set connection string accordingly
            SqlConnection sqlConnection = new SqlConnection();
            sqlConnection.ConnectionString = ConfigurationManager.ConnectionStrings["SQL2008_661086_trirandEntities"].ConnectionString;
            sqlConnection.Open();

            string sql = @"
                            SELECT * FROM 
                            (
    		                    SELECT row_number() OVER 
                                    ({0})
                                AS 
    			                    rownum, OrderID, CustomerID, OrderDate, Freight, ShipName
		                        FROM 
                                    OrdersLarge
		                        WHERE
                                    OrderID <= 500000
                            )
	                        AS A
	                        WHERE A.rownum BETWEEN {2} AND {3}";

            string orderClause = String.IsNullOrEmpty(orderByColumn) ? String.Empty : "ORDER BY " + orderByColumn;
            string whereClause = String.IsNullOrEmpty(searchExpression) ? String.Empty : "WHERE " + searchExpression;

            sql = String.Format(sql, orderClause, whereClause, startIndex + 1, startIndex + pageSize);

            SqlCommand cmd = new SqlCommand(sql, sqlConnection);

            // Create a SqlDataAdapter to get the results as DataTable
            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);

            // Create a new DataTable
            DataTable dtResult = new DataTable();

            // Fill the DataTable with the result of the SQL statement
            sqlDataAdapter.Fill(dtResult);

            sqlConnection.Close();

            return dtResult;
        }

        protected int GetRowCount(string orderByColumn, string searchExpression)
        {
            // Create a new Sql Connection and set connection string accordingly
            SqlConnection sqlConnection = new SqlConnection();
            sqlConnection.ConnectionString = ConfigurationManager.ConnectionStrings["SQL2008_661086_trirandEntities"].ConnectionString;
            sqlConnection.Open();

            string sql = @"
                            SELECT COUNT(*) FROM 
                            (
    		                    SELECT row_number() OVER 
                                    ({0})
                                AS 
    			                    rownum, OrderID, CustomerID, OrderDate, Freight, ShipName
		                        FROM 
                                    OrdersLarge
		                        WHERE 
                                    OrderID <= 500000
                            ) AS A";


            string orderClause = String.IsNullOrEmpty(orderByColumn) ? String.Empty : " ORDER BY " + orderByColumn;
            string whereClause = String.IsNullOrEmpty(searchExpression) ? String.Empty : " WHERE " + searchExpression;

            sql = String.Format(sql, orderClause, whereClause);


            SqlCommand cmd = new SqlCommand(sql, sqlConnection);
            int count = (int)cmd.ExecuteScalar();

            sqlConnection.Close();

            return count;
        }

       
    }
}
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" />