// returns true if the string is empty
function isEmpty(str){
  return (str == null) || (str.length == 0);
}
// returns true if the string is a valid email
function isEmail(str){
  if(isEmpty(str)) return false;
  var re = /^[^\s()<>@,;:\/]+@\w[\w\.-]+\.[a-z]{2,}$/i
  return re.test(str);
}
// returns true if the string only contains characters A-Z or a-z
function isAlpha(str){
  var re = /[^a-zA-Z]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string only contains characters 0-9
function isNumeric(str){
  var re = /[\D]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string only contains characters A-Z, a-z or 0-9
function isAlphaNumeric(str){
  var re = /[^a-zA-Z0-9]/g
  if (re.test(str)) return false;
  return true;
}
// returns true if the string's length equals "len"
function isLength(str, len){
  return str.length == len;
}
// returns true if the string's length is between "min" and "max"
function isLengthBetween(str, min, max){
  return (str.length >= min)&&(str.length <= max);
}
// returns true if the string is a US phone number formatted as...
// (000)000-0000, (000) 000-0000, 000-000-0000, 000.000.0000, 000 000 0000, 0000000000
function isPhoneNumber(str){
  var re = /^\(?[2-9]\d{2}[\)\.-]?\s?\d{3}[\s\.-]?\d{4}$/
  return re.test(str);
}

function isPostcode(str) {
 var re = /^\d{4}[\s-]?[a-zA-Z]{2}$/ ///([0-9]){4}\s{1}([A-Z]){2}/
 return re.test(str);   
}

// returns true if the string is a valid date formatted as...
// mm dd yyyy, mm/dd/yyyy, mm.dd.yyyy, mm-dd-yyyy
function isDate(str){
  var re = /^(\d{1,2})[\s\.\/-](\d{1,2})[\s\.\/-](\d{4})$/
  if (!re.test(str)) return false;
  var result = str.match(re);
  var m = parseInt(result[1]);
  var d = parseInt(result[2]);
  var y = parseInt(result[3]);
  if(m < 1 || m > 12 || y < 1900 || y > 2100) return false;
  if(m == 2){
          var days = ((y % 4) == 0) ? 29 : 28;
  }else if(m == 4 || m == 6 || m == 9 || m == 11){
          var days = 30;
  }else{
          var days = 31;
  }
  return (d >= 1 && d <= days);
}
// returns true if "str1" is the same as the "str2"
function isMatch(str1, str2){
  return str1 == str2;
}
// returns true if the string contains only whitespace
// cannot check a password type input for whitespace
function isWhitespace(str){ // NOT USED IN FORM VALIDATION
  var re = /[\S]/g
  if (re.test(str)) return false;
  return true;
}
// removes any whitespace from the string and returns the result
// the value of "replacement" will be used to replace the whitespace (optional)
function stripWhitespace(str, replacement){// NOT USED IN FORM VALIDATION
  if (replacement == null) replacement = '';
  var result = str;
  var re = /\s/g
  if(str.search(re) != -1){
    result = str.replace(re, replacement);
  }
  return result;
}
// validate the form
function validateForm(f, preCheck){
  var errors = '';
  if(preCheck != null) errors += preCheck;
  var i,e,t,n,v;
  for(i=0; i < f.elements.length; i++){
    e = f.elements[i];
    if(e.optional) continue;
    t = e.type;
    n = e.name;
    N = e.id;
    v = e.value;
    l = e.lenght;
    if (t == 'text' || t == 'password' || t == 'textarea'){
      if(isEmpty(v)){
        errors += 'Veld '+N+' mag niet leeg zijn.\n'; continue;
      }
      //if(v == e.defaultValue){
      //  errors += 'Veld '+N+' moet iets ingevuld worden.\n'; continue;
      //}    
      if(e.isAlpha){
        if(!isAlpha(v)){
          errors += n+' alleen de karakters A-Z a-z zijn geldig.\n'; continue;
        }
      }
      if(e.isNumeric){
        if(!isNumeric(v)){
          errors += n+' alleen de karakters 0-9 zijn geldig.\n'; continue;
        }
      }
      if(e.isAlphaNumeric){
        if(!isAlphaNumeric(v)){
          errors += N+' alleen de karakters A-Z a-z 0-9 zijn geldig.\n'; continue;
        }
      }
      if(e.isEmail){
        if(!isEmail(v)){
          errors += v+' is geen geldig E-mailadres.\n'; continue;
        }
      }
      if(e.isLength != null){
        var len = e.isLength;
        if(!isLength(v,len)){
          errors += n+' must contain only '+len+' characters.\n'; continue;
        }
      }
      if(e.isLengthBetween != null){
        var min = e.isLengthBetween[0];
        var max = e.isLengthBetween[1];
        if(!isLengthBetween(v,min,max)){
          errors += N+' moet minstens '+min+' bevatten en maximaal '+max+' karakters bevatten.\n'; continue;
        }
      }
      if(e.isBannknumber != null){
        var min = e.isBannknumber[0];
        var max = e.isBannknumber[1];
        var melding = e.isBannknumber[2]; 
        if(!isNumeric(v)) { 
          errors += N+' Het '+N+' mag geen punten of comma\'s bevatten \n'; continue;        
        }else if(!isLengthBetween(v,min,max)){
          errors += N+' moet minstens '+min+' bevatten en maximaal '+max+' karakters bevatten.\n'+melding+'\n'; continue;
        }
      }
      if(e.isPhoneNumber){
        if(!isPhoneNumber(v)){
          errors += v+' is geen geldig telefoonnummer.\n'; continue;
        }
      }
      if(e.isPostcode){
        if(!isPostcode(v)){
          errors += v+' is geen geldig postcode formaat.\n'; continue;
        }
      }
      if(e.isDate){
        if(!isDate(v)){
          errors += v+' is geen geldige datum.\n'; continue;
        }
      }
      if(e.isMatch != null){
        if(!isMatch(v, e.isMatch)){
          errors += N+' komt niet overeen.\n'; continue;
        }
      }
    }
    if(t.indexOf('select') != -1){
      if(isEmpty(e.options[e.selectedIndex].value)){
        errors += 'Selecteer in keuzevak '+N+' een optie.\n'; continue;
      }
    }
    if(t == 'file'){
      if(isEmpty(v)){
        errors += n+' needs a file to upload.\n'; continue;
      }
    }
  }
  if(errors != '') alert(errors);
  return errors == '';
}

function addItemToCheck(value, value, value){
 return true;
}
 
function akkoord(value){ 
	if (value) {
		var answer = confirm ("Gaat u akkoord met het door u ingevoerde bedrag?")
		if (answer) return true; 
		else return false;
    } else {
        return false;
    }
}

function checkRadio(aRadioGroup, alreadychecked){    
    if (alreadychecked) {
       aCheck = false; 
       for (i=0; i<aRadioGroup.length; i++){ 
            if (aRadioGroup[i].checked){ 
                //alert("Item "+(i+1)+" checked!"); 
                aCheck = true; 
            } 
        }
        
        if (!aCheck){
            alert("Er is nog geen betaalwijze gekozen");
            return false;
        } else {
            return true;
        } 
    } else {
        return alreadychecked ;
    }
} 

function BankInputCheck (fld, e){
    var sep = 0;
    var i = 0;
    var len = 0;
    var key = ''; 
    var strCheck = '0123456789';
    var whichCode = (window.Event) ? e.which : e.keyCode;

    if (whichCode == 13) return true;  // Enter
    if (whichCode == 8) return true;  // Delete

    key = String.fromCharCode(whichCode);  // Get key value from key code

    if (strCheck.indexOf(key) == -1) return false;  // Not a valid key
    else return true;   
}
// usage: onKeyPress="return(brInputCheck(this,event))"  

function BankInputCheckV2(evt){
	var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57)){
    	return false;
	}
    return true;
}

function ElfCheckBank(fld) {
    var b = fld.value;
    var total = 0;
    var j = b.length;
    
    if(b.length == 9) { 
        for( var i = 0; i < b.length; i++ ) {
            total += b.charAt( i ) * j;
            j -= 1;
        }
        if( ( total % 11 ) != 0 ) {
            alert( "Geen geldig bankrekeningnummer!" );
        }
    } else if (b.length != 7) {
        alert( "Geen geldig bankrekeningnummer!" ); 
    }
}

function checkAll(form) {
    if (!Validation(form)) {
        return false;
    } else if (!akkoord(check(form))) {
		return false;
    }
}