//======= TEXTBOX DATE VALIDATOR ================================
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 dtCh= "/";
	var minYear=1900;
	var maxYear=2100;

	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
	}else if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}else if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}else if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}else if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function ValidateDateFormat(txtobject){ //<<<<<---- function to be used
	if(!isEmpty(txtobject.value)){
		if (isDate(txtobject.value)==false){
			txtobject.focus()
			txtobject.select()
			return false
		}else{
			return true
		}
	}
 }
//======= END HERE TEXTBOX DATE VALIDATOR ================================


//======= TIME VALIDATOR =================================================

function IsValidTime(timeStr) {
// Checks if time is in HH:MM format.
	var timePat = /^(\d{1,2}):(\d{2})?$/;
	
	var matchArray = timeStr.match(timePat);
		if (matchArray == null) {
		alert("Time is not in a valid format.");
		return false;
		}
	hour = matchArray[1];
	minute = matchArray[2];

	
	if (hour < 0  || hour > 23) {
		alert("Hour must be between 0 and 23.");
		return false;
	}else if (minute<0 || minute > 59) {
		alert ("Minute must be between 0 and 59.");
		return false;
	}else{
		return true;
	}
}

function ValidateTimeFormat(txtobject){ //<<<<<---- function to be used
	if(!isEmpty(txtobject.value)){
		if (IsValidTime(txtobject.value)==false){
			txtobject.focus()
			txtobject.select()
			return false
		}else{
			return true
		}
	}
 }
//======= END TIME VALIDATOR =================================================


//======== EMAIL VALIDATOR ===================================================

function IsEmail(emailstr) {

	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!emailstr.match(filter)) {
		return false;
	}else{
		return true;
	}
}

function ValidateEmail(txtobject){
	var emailstr = txtobject.value
	
	if (!IsEmail(emailstr)) {
		alert('Please provide a valid email address');
		txtobject.focus()
		txtobject.select()
		return false;
	}else{
		return true;
	}

}
//======== END EMAIL VALIDATOR ===================================================


// ====== ALPHABET VALIDATGR =====================================================
function isAlpha(str){
  var re = /[^a-zA-Z]/g
  if (str.match(re)) return false;
  return true;
}

// ====== END ALPHABET VALIDATGR ==================================================

// ====== NUMBER VALIDATOR  =======================================================
function isNumeric(str){
  var re = /[\D]/
  if (str.match(re)) return false;
  return true;
}
// ====== END  NUMBER VALIDATOR  ==================================================

// ====== ALPHA NUMERIC VALIDATOR  ================================================
function isAlphaNumeric(str){
  var re = /[^a-zA-Z0-9]/g
  if (str.match(re)) return false;
  return true;
}
// ====== END ALPHA NUMERIC VALIDATOR  ============================================

//======= EMPTY VALIDATION ========================================================
function isEmpty(str){
 var  trimstr = str.replace(/^\s*|\s*$/,"");
  return (trimstr == null) || (trimstr.length == 0);
}
//======= EBD EMPTY VALIDATION ===================================================

//======= CHECK VALUE RADIO BUTTON ===============================================
function ValidateRadioButton(btn) {
    for (var ctr=0; ctr<btn.length; ctr++) {
        if (btn[ctr].checked) {
			return true;
		}
    }
	return false;
}

//======= END CHECK VALUE RADIO BUTTON ============================================


//======= RETURN VALUE RADIO BUTTON ===============================================
function ValueRButton(btn) {
    for (var ctr=0; ctr<btn.length; ctr++) {
        if (btn[ctr].checked) {
			return btn[ctr].value;
		}
    }
}

//======= END RETURN VALUE RADIO BUTTON ============================================