Javascript Calling from Code behind in ASP.NET
Calling a javascript function in an aspx page is a general scenario but calling the same function from code behind and registering a javascript in the code behind and dynamically calling that function is something new and have to learn. So in this article you can find out different scenarios of calling a javascript function.
1. Calling a javascript function from aspx page (general way)
2. Calling a javascript function from code behind
3. Registering a javascript function dynamically and calling it through an event.
4. Dynamically calling a dynamically registered javascript function.
ASPX PAGE:
In the aspx page we can simply writes the code like as following and in an any events of control we can fire the function.
Default.aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!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>Untitled Page</title>
<script type="text/javascript">
function CallingFun()
{
alert('Hi, Iam javascript function. Calling from asp.net');
}
function test()
{
alert('Hi, This is from button(general way)’);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<%--calling test function here--%>
<input type="button" value=”Click Me” onclick=”test()” />
<%--calling testing function which is dynamically registered from code behind--%>
<input type="button" runat="server" id="btnclick" value="Call Code behind Javascript method" onclick="testing()" />
</div>
</form>
</body>
</html>
Code Behind:
using System;
using System.Web.UI;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
javaScript();
System.Web.UI.ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), "Script", "CallingFun();", true);
}
private void javaScript()
{
string script = @"<script type=""text/javascript"" language=""Javascript"">
function testing()
{
alert('Hey Dude, Im from code behind');
}
</script>";
Page.ClientScript.RegisterClientScriptBlock(GetType(), "sivagtest", script);
}
}
