Freeze Gridview header row inside Update Panel after post back using JavaScript in ASP.Net

Hi ryadav,

Check this example. Now please take its reference and correct your code.

HTML

<form id="form1" runat="server">
    <asp:ScriptManager runat="server" />
    <asp:UpdatePanel runat="server">
        <ContentTemplate>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
                <Columns>
                    <asp:TemplateField>
                        <ItemTemplate>
                            <asp:CheckBox ID="chkRow" runat="server" AutoPostBack="true" />
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="ContactName" HeaderText="Contact Name" />
                    <asp:BoundField DataField="City" HeaderText="City" />
                    <asp:BoundField DataField="Country" HeaderText="Country" />
                </Columns>
            </asp:GridView>
        </ContentTemplate>
    </asp:UpdatePanel>
</form>
<script type="text/javascript">
    var GridId = "<%=GridView1.ClientID %>";
    var ScrollHeight = 300;
    window.onload = function () {
        ApplyGridViewFreeze();
    }

    var prm = Sys.WebForms.PageRequestManager.getInstance();
    if (prm != null) {
        prm.add_endRequest(function (sender, e) {
            if (sender._postBackSettings.panelsToUpdate != null) {
                ApplyGridViewFreeze();
            }
        });
    };

    function ApplyGridViewFreeze() {
        var grid = document.getElementById(GridId);
        var gridWidth = grid.offsetWidth;
        var gridHeight = grid.offsetHeight;
        var headerCellWidths = new Array();
        for (var i = 0; i < grid.getElementsByTagName("TH").length; i++) {
            headerCellWidths[i] = grid.getElementsByTagName("TH")[i].offsetWidth;
        }
        grid.parentNode.appendChild(document.createElement("div"));
        var parentDiv = grid.parentNode;

        var table = document.createElement("table");
        for (i = 0; i < grid.attributes.length; i++) {
            if (grid.attributes[i].specified && grid.attributes[i].name != "id") {
                table.setAttribute(grid.attributes[i].name, grid.attributes[i].value);
            }
        }
        table.style.cssText = grid.style.cssText;
        table.style.width = gridWidth + "px";
        table.appendChild(document.createElement("tbody"));
        table.getElementsByTagName("tbody")[0].appendChild(grid.getElementsByTagName("TR")[0]);
        var cells = table.getElementsByTagName("TH");

        var gridRow = grid.getElementsByTagName("TR")[0];
        for (var i = 0; i < cells.length; i++) {
            var width;
            if (headerCellWidths[i] > gridRow.getElementsByTagName("TD")[i].offsetWidth) {
                width = headerCellWidths[i];
            }
            else {
                width = gridRow.getElementsByTagName("TD")[i].offsetWidth;
            }
            cells[i].style.width = parseInt(width - 3) + "px";
            gridRow.getElementsByTagName("TD")[i].style.width = parseInt(width - 3) + "px";
        }
        parentDiv.removeChild(grid);

        var dummyHeader = document.createElement("div");
        dummyHeader.appendChild(table);
        parentDiv.appendChild(dummyHeader);
        var scrollableDiv = document.createElement("div");
        if (parseInt(gridHeight) > ScrollHeight) {
            gridWidth = parseInt(gridWidth) + 17;
        }
        scrollableDiv.style.cssText = "overflow:auto;height:" + ScrollHeight + "px;width:" + gridWidth + "px";
        scrollableDiv.appendChild(grid);
        parentDiv.appendChild(scrollableDiv);
    }
</script>

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        System.Data.DataSet ds = new System.Data.DataSet();
        ds.ReadXml(Server.MapPath("~/App_Data/Customers.xml"));
        GridView1.DataSource = ds;
        GridView1.DataBind();
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Dim ds As Data.DataSet = New Data.DataSet()
        ds.ReadXml(Server.MapPath("~/App_Data/Customers.xml"))
        GridView1.DataSource = ds
        GridView1.DataBind()
    End If
End Sub