Suppose we have a textbox and we have to mask (with asterisk (*) character) a portion of the string (which is a credit card number) when user enter the values one after the other.
That means , if the user enters
XXXX XXXX XXXX XXXX , the output will be
XXXX XX** **** XXXX where X represents any valid number.
The below program will help to do so
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.3.min.js"></script>
<script>
$(document).ready(function() {
$("#txtCCN").keyup(function(e) {
var CCNValue = $(this).val();
$(this).val(CCNValue.substring(0, 7) + CCNValue.substring(7, 15).replace(/[0-9]/g , "*") + CCNValue.substring(15));
});
});
</script>
</head>
<body>
Credit Card number: <input type="text" id="txtCCN" maxlength=19 />
</body>
</html>