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Javascript works from the client
side while server code requires server processing.
It is not possible to direcly invoke a client event through a server event. However there exists a fairly simple methods to achieve this. I will explain one simple way to do it.
It is not possible to direcly invoke a client event through a server event. However there exists a fairly simple methods to achieve this. I will explain one simple way to do it.
Injecting
a javascript code into a label control
This is one of the simplest method
to call a javascript function from code behind. You need to do the following:
1.
Create a new website project
2.
Add a label and button control on your Default.aspx page
3.
You body part of the markup should
now look something like this:
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lblJavaScript" runat="server" Text=""></asp:Label>
<asp:Button ID="btnShowDialogue" runat="server" Text="Show Dialogue" />
</div>
</form>
</body>
4.
Add a javascript function to show a
message box as shown below:
<head runat="server">
<title>Calling javascript function from code behind example</title>
<script type="text/javascript">
function showDialogue() {
alert("this dialogue has been invoked through codebehind.");
}
</script>
</head>
<head runat="server">
<title>Calling javascript function from code behind example</title>
<script type="text/javascript">
function showDialogue() {
alert("this dialogue has been invoked through codebehind.");
}
</script>
</head>
5.
Now double-click on the button and add the following code:
lblJavaScript.Text = "<script type='text/javascript'>showDialogue();</script>";
lblJavaScript.Text = "<script type='text/javascript'>showDialogue();</script>";
6.
Run your project and click the Show Dialogue button
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