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 usingScriptManager.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 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>
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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