Introduction:
In this article I will explain how to call JavaScript function from code behind and show JavaScript alert message from code behind using asp.net.
In this article I will explain how to call JavaScript function from code behind and show JavaScript alert message from code behind using asp.net.
Description:
I explained many articles relating to Asp.net, C#.NET, JavaScript, Gridview, JQuery etc. During working with those articles I came across one situation that is show alert message from code behind after completion of my code execution like our JavaScript alert message.
I explained many articles relating to Asp.net, C#.NET, JavaScript, Gridview, JQuery etc. During working with those articles I came across one situation that is show alert message from code behind after completion of my code execution like our JavaScript alert message.
To display JavaScript alert message from code behind we can do by using ScriptManager.RegisterStartupScript()
method. This method will allow us to show alert message direclty from
code behind or we can call javascript function from code behind in
asp.net.
Declaration of ScriptManager.RegisterStartupScript() metod:
Here
I will explain how to show JavaScript alert message in code behind and
how to call JavaScript function from code behind in asp.net. For that
first create new website and write following code in aspx page| ScriptManager.RegisterStartupScript(Control control, Type type,string key, string script, bool addScriptTags) |
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Call Javascript functions and show alert message from code behind file in asp.net Pagetitle>
<script type="text/javascript">
function Showalert() {
alert('Call JavaScript function from codebehind');
}
script>
head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btnSubmit" runat="server" Text="Show alert" onclick="btnSubmit_Click" />
<asp:Button ID="btnClick" runat="server" Text="Call JavaScript Function"
onclick="btnClick_Click" />
div>
form>
body>
html>
|
Now add following namespaces in codebehind file
using System;
using System.Web.UI;
|
After that write the following code in code behind
C# code
protected void Page_Load(object sender, EventArgs e)
{
}
//This button click event is used to show alert message directly
protected void btnSubmit_Click(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this,GetType(),"showalert","alert('Only alert Message');",true);
}
// This button click event is used to show alert message from JavaScript function
protected void btnClick_Click(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this, GetType(), "displayalertmessage", "Showalert();", true);
}
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