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Tuesday, 2 June 2015

Add JavaScript Function To Button Control in Asp.net Using C#

6/02/2015 - By Pranav Singh 0

This article will show you how you can add a javascript function to a button control in asp.net using c#. In this I have show two ways to assign the javascript function. First by using OnClientClick and second from code behind using c#.


First Way:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="WebApplication2.WebForm3" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Add Javascript Function To Button Control in Asp.net Using c#</title>
    <script language="javascript">
        function ShowClickMessage() {
            alert("This is a click event.");
            return false;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Click to Execute Javascript" OnClientClick="javascript:return ShowClickMessage();"/>
    </div>
    </form>
</body>
</html>

Here in above code I have OnClientClick event to assign the javascript function which will show an alert message.

Second Way:

For this we will use the below html code for aspx page.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="WebApplication2.WebForm3" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Add Javascript Function To Button Control in Asp.net Using c#</title>
    <script language="javascript">
        function ShowClickMessage() {
            alert("This is a click event.");
            return false;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Click to Execute Javascript"/>
    </div>
    </form>
</body>
</html>

Now from code behind add the below code on page load.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
    public partial class WebForm3 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Button1.Attributes.Add("onclick", "javascript:return ShowClickMessage();");
        }
    }
}

In above code I have assign and attribute to button control . Now we have done run the page to check the output.



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