<html>
<head>
<title>Girfa :
Student Help</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
function
filecheck()
{
var extension = $('#file').val().split('.').pop().toLowerCase();
if ($.inArray(extension, ['png', 'jpg', 'jpeg']) ==
-1) {
alert('Sorry,
invalid extension.');
}
else
alert('ok
Fine');
}
</script>
</head>
<body>
Select File : <input type="file" name="file" id="file"/><br />
<button onclick="filecheck()">Check</button>
</body>
</html>
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