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Alert for unsaved changes in form in JavaScript
Following is the code to display an alert for form’s unsaved changes in JavaScript −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
input {
margin: 10px;
}
</style>
</head>
<body onbeforeunload="return pageUnload()">
<h1>Alert for unsaved changes in form</h1>
<form>
Username <input type="text" />
<br />
Password <input type="password" /><br />
<button type="submit">SUBMIT</button>
</form>
<br />
<script>
function pageUnload() {
return "The data on this page will be lost if you leave";
}
</script>
</body>
</html>
Output
If we click on the reload button then the following warning will be shown −
Updated on: 2020-07-18T07:13:19+05:30
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