How to display alert message using javascript in asp.net using c#

Posted by Unknown On Sunday, 6 October 2013 0 comments
Hi, In this post I describe that how to give alert msg on button click event using javascript.
For this I have take one Example as follow.
First of all take one .aspx form and put one text box and one button.
And then define the function Confitm() in between <head></head> tag as mention in example below.
And then call the function onClientClick event of button.

Example=>

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AlerMsgUsingJavaScript.aspx.cs" 

Inherits="AlerMsgUsingJavaScript" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
       <script language="javascript" type="text/javascript">
        function Confirm() {


            var pre_qty;

            var pqty = document.getElementById("<%=txtbx_presentqty1.ClientID %>");
            pre_qty = pqty.value;
            if (pre_qty != '') {

                return true;
            }
            else {
                alert('Enter Value');
                return false;
            }

        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:TextBox ID="txtbx_presentqty1" runat="server"></asp:TextBox>
            <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="return Confirm()" 

/>
        </div>
    </form>
</body>
</html>
OutPut=>
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