// Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
// Modificaciones © 2004 Tecnics Internet.

// email
function checkEmail (strng) {
var error="";
if (strng == "") {
   error = "No ha introducido una dirección de email.\n";
}

    var emailFilter=/^.+@.+\..{2,3}$/;
    if (!(emailFilter.test(strng))) { 
       error = "Por favor, introduzca una dirección de email correcta.\n";
    }
    else {
//test email for illegal characters
       var illegalChars= /[\(\)\<\>;\,\;\:\\\"\[\]]/
         if (strng.match(illegalChars)) {
          error = "La dirección de email contiene carácteres no válidos\n";
       }
    }
return error;    
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng) {
var error = "";
if (strng == "") {
   error = "No ha introducido un número de teléfono.\n";
}

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "El número de teléfono contiene carácteres no válidos.\n";
  
    }
    if (!(stripped.length < 15)) {
	error = "El número de teléfono tiene una longitud incorrecta.\n";    } 
return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "No ha introducido un password.\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "The password is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
    }  
return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
}


    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 10)) {
       error = "The username is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "The username contains illegal characters.\n";
    } 
return error;
}       


// non-empty textbox

function isEmpty(strng) {
var error = "";
  if (strng.length == 0) {
     error = "Es obligatorio.\n"
  }
return error;	  
}

// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue) {
var error = "";
   if (!(checkvalue)) {
       error = "Por favor, escoja una opción.\n";
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice) {
var error = "";
    if (choice == 0) {
    error = "No escogió ninguna opción de la lista desplegable.\n";
    }    
return error;
}    

// Es numerico
function isNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;
   var error = "";

    for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   if (!IsNumber) {
	   error = "El valor del campo no es numérico.\n"
   }
   return error;
}

// Es visa? (solo comprueba que haya datos, no CRC). 
function isVisa(sText)
{

	var error = ""

	error = isEmpty(sText);
	if (error == "")
	{
		if (sText.length != 16) {
			error = "Error en la cantidad de cifras";
		} else {
			error = isNumeric(sText);
		}
	}
	return error;
}