//DOM FUNCTIONS

function showHideTag(tag,visibility)
{
//Valores para visibility: hidden | visible
	document.getElementById(tag).style.visibility = visibility;
}


//Funciones para menejo de caracteres
function trim(s) {
  while (s.substring(0,1) == ' ') {
    s = s.substring(1,s.length);
  }
  while (s.substring(s.length-1,s.length) == ' ') {
    s = s.substring(0,s.length-1);
  }
  return s;
}

//Funciones de validacion de RUT
function validaM11(rut, dv) {
    var suma = 0;
    var mul = 2;
    var i = 0;
    for (i = rut.length-1; i >= 0; i--) {
        suma = suma + rut.charAt(i) * mul;
        mul = mul==7 ? 2 : mul+1;
    }
    var dvr = '' + (11 - suma % 11);
    if (dvr == '10')
        dvr = 'K';
    else if (dvr=='11')
        dvr = '0';
    if (dvr != dv)
        return false;
    else
        return true;
}

function isRut(rut, dv) {
    var flag = true;
    if (rut == null || rut=='' || !isNumero(rut) ||
        dv == null || dv == '' || (!isNumero(dv) && dv != 'K'))
    {
        //alert("Fallo en isRut");
        flag=false;
    }

    return flag;
}

function validaRutDv(rut,dv)
{
    var flag = false;
    if (!isRut(rut,dv))    
    {
        //alert("Fallo al retornar de isRut");
        return flag;
    }
    
    if (!validaM11(rut,dv))
    {
        //alert("Fallo en validaM11");
        return flag;
    }
    
    return true;
}

function validaRut(rut)
{
    var dv = "";
    var flag = false;
    
    rut = trim(rut);

    if (rut == "" || rut == null)
    {
        //alert("Error 001, validacion de rut");
        return flag;
    }
    
    dv = rut.substring(rut.length-1,rut.length);
    rut = rut.substring(0,rut.length-2);
    
    //alert(rut + " " + dv);
    
    if (!validaRutDv(rut,dv))
    {
        //alert("Error en validaRutDv");
        return flag;
    }
    
    return true;
}

//Funciones numericas
function isNumero(str) {
    var flag = true;
    var i = 0;
    var nums = new Array(1,1,1,1,1,1,1,1,1,1);
    while (i < str.length && flag) {
        flag = (nums[str.charAt(i++)] != null);
    }
    return flag;
}
//funciones para validacion de correo
function checkMail(correo)
{
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(correo)) return true;
	else return false;
}

// Declaring valid date character, minimum year and maximum year
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr,dtCh){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("El formato de la fecha debe ser : dd" + dtCh + "mm" + dtCh + "yyyy");
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("El mes ingresado no es valido");
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Día ingresado es invalido");
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("El año debe tener 4 digitos y debe estar entre "+minYear+" y "+maxYear);
		return false;
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Ingresar una fecha valida");
		return false;
	}
return true;
}