// ----------------------------------------------------------------------
//           FormCheq.js (c) ChaTo [www.chato.cl] 1998
//           basado en FormChek.js (c) Eric Krock 1997 Netscape Corp.
// ----------------------------------------------------------------------
// Rutinas para verificacion de formularios, basado en FormChek.js
// Parte del curso "TEJEDORES DEL WEB" http://www.TejedoresDelWeb.com/
// ---------------------------------------------------------------------- 


//alert ("Validar.js");


var defaultEmptyOK = false
var checkNiceness = true;
var digits = "0123456789";
var lowercaseLetters = "abcdefghijklmnopqrstuvwxyzáéíóúñü"
var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZÁÉÍÓÚÑ"
var whitespace = " \t\n\r";
var phoneChars = "()-+ ";
var mMessage = "Error: no puede dejar este espacio vacio"
var pPrompt = "Error: ";
var pAlphanumeric = "ingrese un texto que contenga solo letras y/o numeros";
var pAlphabetic   = "ingrese un texto que contenga solo letras";
var pInteger = "ingrese un numero entero";
var pNumber = "ingrese un numero";
var pPhoneNumber = "ingrese un número de teléfono";
var pEmail = "ingrese una dirección de correo electrónico válida";
var pName = "ingrese un texto que contenga solo letras, numeros o espacios";
var pNice = "no puede utilizar comillas aqui";

function makeArray(n) {
   for (var i = 1; i <= n; i++) {
      this[i] = 0
   } 
   return this
}


function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}

function isWhitespace (s)
{   var i;
    if (isEmpty(s)) return true;
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        // si el caracter en que estoy no aparece en whitespace,
        // entonces retornar falso
        if (whitespace.indexOf(c) == -1) return false;
    }
    return true;
}



function stripCharsInBag (s, bag)
{   var i;
    var returnString = "";

    // Buscar por el string, si el caracter no esta en "bag", 
    // agregarlo a returnString
    
    for (i = 0; i < s.length; i++)
    {   var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }

    return returnString;
}


function stripCharsNotInBag (s, bag)
{   var i;
    var returnString = "";
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) != -1) returnString += c;
    }
    return returnString;
}


function stripWhitespace (s)
{   return stripCharsInBag (s, whitespace)
}

function charInString (c, s)
{   for (i = 0; i < s.length; i++)
    {   if (s.charAt(i) == c) return true;
    }
    return false
}

function stripInitialWhitespace (s)
{   var i = 0;
    while ((i < s.length) && charInString (s.charAt(i), whitespace))
       i++;
    return s.substring (i, s.length);
}

function isLetter (c)
{
    return( ( uppercaseLetters.indexOf( c ) != -1 ) ||
            ( lowercaseLetters.indexOf( c ) != -1 ) )
}

function isDigit (c)
{   return ((c >= "0") && (c <= "9"))
}

function isLetterOrDigit (c)
{   return (isLetter(c) || isDigit(c))
}


function isInteger (s)
{   var i;
//	alert("isInteger");

	if (isEmpty(s)) 
       if (isInteger.arguments.length == 1) return defaultEmptyOK;
       else return (isInteger.arguments[1] == true);
    
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if( i != 0 ) {
            if (!isDigit(c)) return false;
        } else { 
            if (!isDigit(c) && (c != "-") || (c == "+")) return false;
        }
    }
    return true;
	
}

function isNumber (s)
{   var i;
    var dotAppeared;

    dotAppeared = false;
    if (isEmpty(s)) 
       if (isNumber.arguments.length == 1) return defaultEmptyOK;
       else return (isNumber.arguments[1] == true);
    
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if( i != 0 ) {
            if ( c == "." ) {
                if( !dotAppeared )
                    dotAppeared = true;
                else
                    return false;
            } else     
                if (!isDigit(c)) return false;
        } else { 
            if ( c == "." ) {
                if( !dotAppeared )
                    dotAppeared = true;
                else
                    return false;
            } else     
                if (!isDigit(c) && (c != "-") || (c == "+")) return false;
        }
    }
    return true;
}

function isAlphabetic (s)
{   var i;

    if (isEmpty(s)) 
       if (isAlphabetic.arguments.length == 1) return defaultEmptyOK;
       else return (isAlphabetic.arguments[1] == true);
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is letter.
        var c = s.charAt(i);

        if (!isLetter(c))
        return false;
    }
    return true;
}

function isAlphanumeric (s)
{   var i;

    if (isEmpty(s)) 
       if (isAlphanumeric.arguments.length == 1) return defaultEmptyOK;
       else return (isAlphanumeric.arguments[1] == true);

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (! (isLetter(c) || isDigit(c) ) )
        return false;
    }

    return true;
}


function isName (s)
{
    if (isEmpty(s)) 
       if (isName.arguments.length == 1) return defaultEmptyOK;
       else return (isAlphanumeric.arguments[1] == true);
    
    return( isAlphanumeric( stripCharsInBag( s, whitespace ) ) );
}

function isPhoneNumber (s)
{   var modString;
    if (isEmpty(s)) 
       if (isPhoneNumber.arguments.length == 1) return defaultEmptyOK;
       else return (isPhoneNumber.arguments[1] == true);
    modString = stripCharsInBag( s, phoneChars );
    return (isInteger(modString))
}


function isEmail (s)
{
    if (isEmpty(s)) {
       if (isEmail.arguments.length == 1) return defaultEmptyOK;
       else return (isEmail.arguments[1] == true);
	}
    if (isWhitespace(s)) return false;
    var i = 1;
    var sLength = s.length;
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }

    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else {
		return true;}
}


function isNice(s)
{
        var i = 1;
        var sLength = s.length;
        var b = 1;
        while(i<sLength) {
                if( (s.charAt(i) == "\"") || (s.charAt(i) == "'" ) ) b = 0;
                i++;
        }
        return b;
}

function statBar (s)
{   window.status = s
}

function warnEmpty (theField)
{   theField.focus()
    alert(mMessage)
    statBar(mMessage)
    return false
}

function warnInvalid (theField, s)
{   theField.focus()
    theField.select()
    alert(s)
    statBar(pPrompt + s)
    return false
}


function checkField (theField, theFunction, emptyOK, s)
{   
    var msg;
    if (checkField.arguments.length < 3) emptyOK = defaultEmptyOK;
    if (checkField.arguments.length == 4) {
        msg = s;
    } else {
        if( theFunction == isAlphabetic ) msg = pAlphabetic;
        if( theFunction == isAlphanumeric ) msg = pAlphanumeric;
        if( theFunction == isInteger ) msg = pInteger;
        if( theFunction == isNumber ) msg = pNumber;
        if( theFunction == isEmail ) msg = pEmail;
        if( theFunction == isPhoneNumber ) msg = pPhoneNumber;
        if( theFunction == isName ) msg = pName;
    }
    
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;

    if ((emptyOK == false) && (isEmpty(theField.value))) 
        return warnEmpty(theField);

    if ( checkNiceness && !isNice(theField.value))
        return warnInvalid(theField, pNice);

    if (theFunction(theField.value) == true) 
        return true;
    else
        return warnInvalid(theField,msg);

}
/*Para comprobar la validez de la fecha. Conviene tener un control para dia, otro para mes y otro para año*/
var daysInMonth = makeArray(12);
daysInMonth[1] = 31;
daysInMonth[2] = 29;
daysInMonth[3] = 31;
daysInMonth[4] = 30;
daysInMonth[5] = 31;
daysInMonth[6] = 30;
daysInMonth[7] = 31;
daysInMonth[8] = 31;
daysInMonth[9] = 30;
daysInMonth[10] = 31;
daysInMonth[11] = 30;
daysInMonth[12] = 31;

function makeArray(n) {
   for (var i = 1; i <= n; i++) {
      this[i] = 0;
   } 
   return this;
}

function daysInFebruary(whichYear) {
    return (whichYear % 4 == 0 && (!(whichYear % 100 == 0) || (whichYear % 400 == 0)) ? 29 : 28);
}

function isDate(mm, dd, yyyy) {
	if (mm !="" && !(mm > 0 && mm < 13))
	{
		//alert ("Invalid Month! Please enter a value between 1 and 12.");
		return false;
	}
	if (dd !="" && !(dd > 0 && dd < 32))
	{
		//alert ("Invalid Date! Please enter a value between 1 and 31.");
		return false;
	}
	if ((dd!="" && mm!="") && dd > daysInMonth[mm])
	{
		//alert ("Invalid Date for this Month!")
		return false;
	}
	if (yyyy !="" && !(yyyy > 1889 && yyyy < 2011))
	{
		alert ("Invalid Year! Please enter a value between 1890 and 2010.");
		return false;
	}
	if ((mm=="2" || mm=="02" && dd!="" && yyyy!="") && dd > daysInFebruary(yyyy))
	{
		//alert ("Invalid Date for this Year!")
		return false;
	}
	return true;
}

/*Funcion para pasar al control siguiente de un formulario con el enter*/
function Siguiente(DnEvents,control)
       {
        
		K = navigator.appName=="Netscape" ? DnEvents.which : DnEvents.keyCode;
        if (K==13) 
		 {
		  control.focus()
		 }
		}         


/*Funciones añadidas por aho*/
function isDateTodo(cadena){
		if (cadena.length=10){
			dia=(cadena.substr(0,2));
			mes=(cadena.substr(3,2));
			ano=(cadena.substr(6,4));
			sep1=(cadena.substr(2,1));
			sep2=(cadena.substr(5,1));
//			alert (cadena);
//			alert (dia);
//			alert (mes);
//			alert (ano);
			if (isDate( mes, dia, ano)==true)
			{ 
				if (sep1=="/" && sep2=="/") {
					return true; 				
				}
				else{return false;}
	    	}
			else{return false; }
		}
		else
		{return false;}

}


function nif(dni) {
    var numero = dni % 23 + 1;
    letra='TRWAGMYFPDXBNJZSQVHLCKET';
    letra=letra.substring(numero-1,numero);
    return letra;
  }
  
function es_correctoDNI (dnie) {
var i;
var dni=dnie;

for (i = 0; i < 8; i++)
    {   
        var c = dni.charAt(i);
        if (!isDigit(c)) {
            return false;
        }
    }
    var letra_introducido = nif(dni.substring(0,8));
    var letra_real = dni.charAt(8);
    if (letra_introducido == letra_real) { 
        return true;
    } else { 
//			alert ("Debe introducir un dni válido");
//			alert (letra_real);
//			alert (letra_introducido);
            return false;
    }         
}

/*
*/