//*******************************************************************************************
//*************** VALIDACION DE FECHAS  ******************************************
//*******************************************************************************************

var dtCh= "-";//caracter separador que vamos a usar
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){
	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("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//alert("Please enter a valid month. month:" + strMonth.length)
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		//alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		//alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		//alert("Please enter a valid date")
		return false
	}
return true
}

function ValidateForm(){
	var dt=document.frmSample.txtDate
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
 }

//*******************************************************************************************
//*************** FIN  VALIDACION DE FECHAS  *************************************
//*******************************************************************************************


//Quita los espacios de una cadena
function trimStr(str) {
  str = this != window? this : str;
  return str.replace(/^\s+/g, '').replace(/\s+$/g, '');
}

// funciones de validación de formularios

function Validate_Fields(data,display_alerts,set_focus){
	//display_alerts -> para que muestre o no el mensaje de error (true/false)
	//set_focus -> para que envie el foco al campo que contiene el valor incorrecto (true/false)

	//Estructura del array data:
	//form_name -> nombre del formulario en el que esta el campo
	//field_name -> nombre de cada campo
	//error_msg -> mensaje de error a mostrar para cada elemento
	//validation_type -> tipo de validacion que lleva cada elemento
	//param-> cualquier parametro relativo a la validacion

	//Tipos de validacion:
	//SelectNoEmpty -> Una combo en la que hay que seleccionar un valor
	//TextNoEmpty -> Un campo de texto que no puede estar vacio
	//Numeric -> un campo numerico
	//NumericNoEmpty -> un campo numerico que no puede estar vacio
	//NumericNoZero -> un campo numerico que no puede ser cero
	//MaxLength -> Comprueba que no se exceda a longitud maxima especificada
	
	fields_ok = true;
	
	
	for (i = 0; i < data.length; i++){
		//alert (data[i]["validation_type"]);
		//alert(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].name);
		if (data[i]["validation_type"] == "SelectNoEmpty"){
			if (document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value == ""){
				fields_ok = false;
				field_num = i;
				break;
			}
		}else if(data[i]["validation_type"] == "TextNoEmpty"){
			if (trimStr(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value).length == 0){
				fields_ok = false;
				field_num = i;
				break;
			}
		}else if(data[i]["validation_type"] == "NumericNoZero"){
			if (isNaN(trimStr(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value)) || parseFloat(trimStr(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value)) == 0){
				fields_ok = false;
				field_num = i;
				break;
			}
		}else if(data[i]["validation_type"] == "Numeric"){
			if (isNaN(trimStr(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value))){
				//document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value = "";
				fields_ok = false;
				field_num = i;
				break;
			}
		}else if(data[i]["validation_type"] == "MaxLength"){
			if (trimStr(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value).length > data[i]["param"]){
				fields_ok = false;
				field_num = i;
				break;
			}
		}else if(data[i]["validation_type"] == "RadioNoEmpty"){
			check_ok = false;
			for(n = 0; n < document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].length; n++){
				if (document.forms[data[i]["form_name"]].elements[data[i]["field_name"]][n].checked == true){
					check_ok = true;
				}
			}
			fields_ok = check_ok;
			if (fields_ok == false){
				field_num = i;
				break;
			}
		}else if(data[i]["validation_type"] == "Date"){
			if (!(isDate(document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].value))){
				fields_ok = false;
				field_num = i;
				break;
			}
		}
	}

	if (fields_ok == true){
		//alert("muuuuuu bien canio!!!");
	}else{
		if (display_alerts == true){
			alert(data[i]["error_msg"]);
		}
		if (set_focus == true){
			document.forms[data[i]["form_name"]].elements[data[i]["field_name"]].focus();
		}
	}

	return fields_ok;
}