How to validate upload file extension
Usage : Simple JavaScript for validate upload file extension. If you use this validation, user can't upload wrong file type.
Compatibility :
JavaScript Code :
Insert this JavaScript in the head section of the html code.
<script type="text/javascript">
function check_file_type(){
var file_name = document.getElementById('upload_file').value;
var file_extension = file_name.substring(file_name.lastIndexOf('.') + 1);
if(file_extension == "gif" || file_extension == "jpg") {
alert("Ok. This is valid file");
return true;
} else {
alert("Invalid File. File Format supported: JPJ and GIF Only");
return false;
}
return true;
}
</script>
Html Code :
<html>
<head>
<title>Check File Extension </title>
</head>
<body>
<input name="upload_file" id="upload_file" type="file" onchange="check_file_type();" />
</body>
</html>
Demo :
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