In this
article we will learn how to call JavaScript function and show JavaScript alert
message from code behind using asp.net.
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:
ScriptManager.RegisterStartupScript(Control control, Type type,string key, string script,
bool addScriptTags)
bool addScriptTags)
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
<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 Page</title>
<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>
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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