Use the jQuery change() method
You can simply use the jQuery change() method to fire an event to do something when the user select any file using the HTML file <input> type box.
Let's try out an example to understand how this method basically works:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery Fire Event on File Select</title>
<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<script>
$(document).ready(function(){
$("#myInput").change(function(){
alert("A file has been selected.");
});
});
</script>
</head>
<body>
<form>
<input type="file" id="myInput">
</form>
</body>
</html>
