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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Validar numero de tarjeta</title>

<script type="text/javascript">
function validarTarjetas(){
  
  
  visa = document.getElementById("visa").value;
  mastercard = document.getElementById("mastercard").value;
     
  visa_error = "";
  mastercard_error = "";     
     
  if (!visa.match(/^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/))
    visa_error = "No es un número de Visa correcto";
  
  
  if (!mastercard.match(/^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/))
  	mastercard_error = "No es un número de Mastercard correcto";
  
  document.getElementById("visa_error").innerHTML = visa_error;
  document.getElementById("mastercard_error").innerHTML = mastercard_error;
   
  
  }
</script>

</head>
<body>

<h1>Validar Numero de tarjeta</h1>


<form action="#">
<label for="visa">VISA: </label><input type="text" id="visa" size="20" value="4552-7204-1234-5678"/> <span id="visa_error" style="color: #f00;"></span><br>
<label for="mastercard">MasterCard: </label><input type="text" id="mastercard" size="20" value="5588-3201-2345-6789"/> <span id="mastercard_error" style="color: #f00;"></span><br>
Utilizar guiones para separar los numeros. No se permiten espacios.<br>
<input type="button" onClick="validarTarjetas();" value="Validar Tarjetas">
</form>


<br><br>
<hr>
Art&iacute;culo disponible en: <a href="http://lineadecodigo.com/2008/03/07/validar-numeros-de-tarjetas-de-credito-con-javascript/">http://lineadecodigo.com/2008/03/07/validar-numeros-de-tarjetas-de-credito-con-javascript/</a><br/>
<a href="http://lineadecodigo.com" title="Linea de Codigo">lineadecodigo.com</a>
</body>
</html>

Change log

r39 by vcuervo on Mar 7, 2008   Diff 
Modificados textos de error
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Older revisions

r38 by vcuervo on Mar 7, 2008   Diff 
Validar numeros de tarjetas
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