/*
 * Javascript common functions to use for the cliend side validations
 * such as empty invalid characters & email address validation
 */
   function isNull(val){
   trim(val);
   return(val==null);}

   function ltrim ( s )
   {
      return s.replace( /^\s*/, "" );
   }

   function rtrim ( s )
   {
      return s.replace( /\s*$/, "" );
   }

   function trim ( s )
   {
      return rtrim(ltrim(s));
   }
	
   function ChkLength(val,maxlen)
   {
		if(val.length < maxlen)
			return false;
		return true	;
   
   }
 function chkAlphanum(s)
{
	
	var charposfn = s.search("[^A-Za-z0-9_]"); 
	var isvalid=0;
	if (charposfn >= 0) 
	{ 
		isvalid=1;
	}
	charposfn = s.search("[a-zA-Z]"); 
	
	if (!(charposfn >= 0))
	{
		isvalid=1;
	}
	charposfn = s.search("[0-9]"); 
	if (!(charposfn >= 0)) 
	{
			isvalid=1;
	}
	if (isvalid==1)
	 	return false;
	return true	;
} 
function RadioCheck(fieldname){
	
		var radiogroup = fieldname; // get the whole set of radio buttons.
		var itemchecked = false;
		for(var j = 0 ; j < radiogroup.length ; ++j) 
		{
			if(radiogroup[j].checked) 
			{
				itemchecked = true;
				break;
			}
		}
		if(!itemchecked) 
			return false;
		else
			return true;
		
}
 function IfSelected(datavalue)
 {
 	if (datavalue == 0)
		return false;
	return true	;
 }  
 function IfSel(datavalue)
 {
 	if (datavalue == -1)
		return false;
	return true	;
 }  
 function isBlank(val){
      trim(val);
      if(val==null){return true;}

      for(var i=0;i<val.length;i++) {
         if ((val.charAt(i)!=' ')&&(val.charAt(i)!="\t")&&(val.charAt(i)!="\n")&&(val.charAt(i)!="\r")){return false;}
         }
      return true;
   }

   function isInvalid(val){
      for(var i=0;i<val.length;i++) {
            if((val.charAt(i)=="!")||(val.charAt(i)=="@")||(val.charAt(i)=="`")||(val.charAt(i)=="~")||(val.charAt(i)=="#")||(val.charAt(i)=="$")||(val.charAt(i)=="%")||(val.charAt(i)=="^")||(val.charAt(i)=="&")||(val.charAt(i)=="*")||(val.charAt(i)=="(")||(val.charAt(i)==")")||(val.charAt(i)=="_")||(val.charAt(i)=="-")||(val.charAt(i)=="+")||(val.charAt(i)=="=")||(val.charAt(i)=="|")||(val.charAt(i)=="'")||(val.charAt(i)==";")||(val.charAt(i)==":")||(val.charAt(i)=="<")||(val.charAt(i)==">")||(val.charAt(i)=="/")||(val.charAt(i)=="?")||(val.charAt(i)==" ")||(val.charAt(i)=="'")){
               return true;
            }
         return false;
      }//end of for
   }//end of function

   function isValidEmail(val){
      trim(val);

      apos=val.indexOf("@");
      dotpos=val.lastIndexOf(".");
      lastpos=val.length-1;

      if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2){
            return (false)
      }
      return true;
   }

function isNumber(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;
}

var dtCh= "/";
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 strMonth=dtStr.substring(0,pos1)
	var strDay=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 : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		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 isGreaterDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=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)
	
	var today=new Date();
	var currmonth=today.getMonth()+1;	
	var curryear=today.getYear();
	var currday=today.getDate();
	
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		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
	}
	if (year<curryear){
		alert("Please enter a Year Greater than today")
		return false
	}	
	if (year==curryear) 
	{
		if (month<currmonth) {	
			alert("Please enter a Month Greater than today");
			return false
		}	
		if (month==currmonth)
		{	
			if (day<=currday){
				alert("Please enter a Day Greater than today");
				return false
			}	
		}	
	}
return true
}