Looking to execute my Javascript only once during page load, and not during postbacks. Using Asp.net 3.5.
Looking to execute my Javascript only once during page load, and not during postbacks. Using Asp.net 3.5.
Within your backend code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ClientScript.RegisterStartupScript(GetType(), "key", "executeFunction();", true);
}
}
Experience the functionality of the Page.IsPostback property by visiting this link
A more efficient approach is to invoke your JavaScript function within the <body> tag during page load. This way, the script will only be called once, avoiding unnecessary repetitions during each postback event.
To prevent accidentally overriding the onload event in the body tag with document.onload in JavaScript, you can also listen for the load event. This issue commonly arises when master pages include content pages that implement their own load event handlers, potentially conflicting with the master page's script.
<script type="text/javascript">
function onPageLoaded() {
//Perform tasks
}
if (document.all) {
//For Internet Explorer
window.attachEvent('onload', onPageLoaded);
} else {
//For other browsers
window.addEventListener('load', onPageLoaded, false);
}
</script>
<html>
<head>
<title>My Webpage</title>
</head>
<body onload="javascript:myFunction()">
<p>Hello, World!</p>
</body>
</html>
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