Show Bootstrap Alert Box with Modal Background at Scroll position in jQuery

Last Reply one month ago By dharmendr

Posted one month ago

I have refered the below article to show the alert message in c# but I am unable to maintain the page scrollbar position.

As the alert displays in upper side of page when the scrollbar is down the page I want to display the alert message even if the scrollbar is down the page.

Show Modal Background below Bootstrap Alert Box using CSS

Posted one month ago Modified on one month ago

Hi Waghmare,

Use the below script.


Master Page

<html xmlns="">
<head runat="server">
    <link rel="stylesheet" href="" />
    <script type="text/javascript" src=""></script>
    <script type="text/javascript" src=""></script>
    <script type="text/javascript">
        function ShowMessage(message, messagetype) {
            var cssclass;
            switch (messagetype) {
                case 'Success':
                    cssclass = 'alert-success'
                case 'Error':
                    cssclass = 'alert-danger'
                case 'Warning':
                    cssclass = 'alert-warning'
                    cssclass = 'alert-info'
            $('body').append('<span id="shadow" style="background: rgba(0,0,0,0.5);position: fixed;top: 0;left: 0;width: 100%;height: 100%;"></span>')
        .append('<div id="alert_div" style="margin: 0;position: relative;top: 50%;left: 10%;-ms-transform: translateY(-50%);transform: translateY(-50%);display: none;width: 80%;" class="alert fade in '
        + cssclass + ' text-center"><a href="#" onclick="$(\'#shadow\').remove()" class="close" data-dismiss="alert" aria-label="close">&times;</a><strong>'
        + messagetype + '!</strong> <span>' + message + '</span></div>');
    <asp:ContentPlaceHolder ID="head" runat="server">
    <form id="form1" runat="server">
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">

Content Page

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    <div style="overflow-x: auto; height: 500px;">
    <asp:UpdatePanel ID="UpPanel" runat="server">
            &nbsp;&nbsp;<asp:Button ID="btnSucess" runat="server" Text="Sucess" CssClass="btn btn-success" />
            &nbsp;&nbsp;<asp:Button ID="btnError" runat="server" Text="Error" CssClass="btn btn-danger" />
            &nbsp;&nbsp;<asp:Button ID="btnWarning" runat="server" Text="Warning" CssClass="btn btn-warning" />
            &nbsp;&nbsp;<asp:Button ID="btnInfo" runat="server" Text="Info" CssClass="btn btn-info" />
            <br />
    <br /><br /><br />
    <script type="text/javascript">
        $(function () {
        function ButtonclickEvent() {
            $("[id*=btnSucess]").on("click", function () {
                ShowMessage("Record submitted successfully", "Success");
            $("[id*=btnError]").on("click", function () {
                ShowMessage("A problem has occurred while submitting data", "Error");

            $("[id*=btnWarning]").on("click", function () {
                ShowMessage("A problem has occurred while submitting data", "Warning");

            $("[id*=btnInfo]").on("click", function () {
                ShowMessage("Please verify your data before submitting", "Info");
        var prm = Sys.WebForms.PageRequestManager.getInstance();
        if (prm != null) {
            prm.add_endRequest(function (sender, e) {
                if (sender._postBackSettings.panelsToUpdate != null) {