How to Validate Creditcard number in Textbox

Hi,
I have created a Textbox for my credit card number entry for my payment webpage. Can anyone help me in telling me the codes of how to make sure 16 digits of the number is entered . Methods such as count or something which i completely forgot?!

Thank you so much.Any advise is appreciated deeply.

Feb 10 '09 #1

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2461

PRR

750

Expert 512MB

googlin i found this

Expand|Select|Wrap|Line Numbers

 
public static bool validCCNum(string num)

{

    // This expression is looking for a series of numbers, which follow the pattern 

    // for Visa, MC, Discover and American Express. It also allows for dashes between sets of numbers

    string pattern = @"^((4\d{3})|(5[1-5]\d{2})|(6011))-?\d{4}-?\d{4}-?\d{4}|3[4,7][\d\s-]{15}$";

    Regex match = new Regex(pattern);

    return match.IsMatch(num);

}
 link

depending on the credit card you are accepting you will have to modify or possible use switch statement for validation...along with regular expression
link

Feb 10 '09 #2

Frinavale

9,735

Expert Mod 8TB

The JavaScript String Object has a length method that returns the length of a string.

Expand|Select|Wrap|Line Numbers

 
<html>

<body>
 
<script type="text/javascript">

function ShowLength(){

   var txt= document.getElementById("myTextBox").value;

   alert(txt.length);

}

</script>
 
<input type="text" id="myTextBox" value="Hello World!" />

<br />

<input type="submit" onclick="ShowLength();" value="Show Length" />

</body>

</html>

Feb 10 '09 #3

AXRabbit

Wow~ very useful. Thank you so much ~ Very appreciate the effort . ^_^

Feb 10 '09 #4

PRR

750

Expert 512MB

Welcome, do continue to post on Bytes again some time.

Feb 10 '09 #5

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