// Note: For all developers When adding a function to the file, the function should either return true or false explicetly

// Usage in jsp/html file: 		if(!checkNull(document.f1.Username,'User Name')) return false; 


var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function checkBlank(formelement,text)
{
	 if (formelement.value!='')
	{
		
      		if(!CheckSqlIjection(formelement,text))return false;
         }
	if (formelement.value=='')
	{
  alert('Enter '+text);
  formelement.focus();
	return false;
  }
	else
	{
	return true;
	}
}

function checkNaN(formelement,text)
{
	if (isNaN(formelement.value))
	{
		alert(text+ " " + "has to be numeric");
		formelement.focus();
		return false;
	}
	else
	{
		return true;
	}
}

function checkEmail(formelement,text)	
{
	if (formelement.value=='')
	{
	  alert('Enter '+text);
	  formelement.focus();
		return false;
	}
	else
	{
		if(formelement.value!='')
		{
			var b=formelement.value.indexOf('@');
			var c=formelement.value.indexOf('.');
			var d=c-b;
			var len=formelement.value.length;
		
			if((d==0)||(c==-1)||(b==-1)||(d==1)||((len-c)==1))
			{
				alert("Enter a valid "+text);
				formelement.focus();
				return false;
			}
			else
			{
				return true;
			}
		}
	}
}

function checkLessLen(formelement,text,len)
{
	if(formelement.value.length<parseInt(len))
	{
		alert('The '+text+' should not be less than '+len+' characters');
		formelement.focus();
		return false;
	}
	else
	{
		return true;
	}
}

function checkGreaterLen(formelement,text,len)
{
	if(formelement.value.length>parseInt(len))
	{
		alert('The '+text+' should not be Greater than '+len+' characters');
		formelement.focus();
		formelement.select()
		return false;
	}
	else
	{
		return true;
	}
}

function checkSpecialChar(formelement,text)	
{
	var msg='true';
	var a=formelement.value;
	var b=a.length;
	var cha='*`~!@#$%^&()+-[]{}/|;:,<>.?';
	var ch=cha.length;
	var i,j;
	for(i=0;i<ch;i++)
	{
		var ch1=cha.substring(i,i+1);
		for(j=0;j<b;j++)
		{
			var a1=a.substring(j,j+1);
			if(a1==ch1)
			{
				msg='Special Characters are not allowed in '+text;
				alert(msg);	
				formelement.focus();
				return false;
			}
		}
	}
	if (msg=='true')
	{
	return true;
	}
}

function checkSpecialChar2(formelement,text)	
{
	var msg='true';
	var a=formelement.value;
	var b=a.length;
	var cha='*~!@#$%^&()+-[]{}/|;:<>?';
	var ch=cha.length;
	var i,j;
	for(i=0;i<ch;i++)
	{
		var ch1=cha.substring(i,i+1);
		for(j=0;j<b;j++)
		{
			var a1=a.substring(j,j+1);
			if(a1==ch1)
			{
				msg='Special Characters are not allowed in '+text;
				alert(msg);	
				formelement.focus();
				return false;
			}
		}
	}
	if (msg=='true')
	{
	return true;
	}
}

function checkSpecialChar1(formelement,text)	
{
	var msg='true';
	var a=formelement.value;
	var b=a.length;
	var cha='*`~!@#$%^&()+-[]{}|;:,<>.?';
	var ch=cha.length;
	var i,j;
	for(i=0;i<ch;i++)
	{
		var ch1=cha.substring(i,i+1);
		for(j=0;j<b;j++)
		{
			var a1=a.substring(j,j+1);
			if(a1==ch1)
			{
				msg='Special Characters are not allowed in '+text;
				alert(msg);	
				formelement.focus();
				return false;
			}
		}
	}
	if (msg=='true')
	{
	return true;
	}
}//special char without / check

function checkSpace(formelement,text)
{
	var msg='true';
	var a=formelement.value;
	var b=a.length;
	var i,j;
		for(j=0;j<b;j++)
		{
			var a1=a.substring(j,j+1);
			if(a1==' ')
			{
				msg='Spaces are not allowed in '+text;
				alert(msg);	
				formelement.focus();
				return false;
			}
		}

	if (msg=='true')
	{
	return true;
	}
}

function checkLEZero(formelement,text)
{
	if (formelement.value <= 0)
	{
		alert('Enter the '+text+' greater than 0.');
		formelement.focus();
		return false;
	}
	else
	{
		return true;
	}
}

//Date check function from here
function isInteger(s,text){
	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){
	//alert(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
}//end isDate()

//webaddress function check from here....
function checkURL(str)
{
	strlen = str.length;
	strlen = strlen - 1;

	firstdot = str.indexOf(".");

	str1 = str.substring(0, 4);
	
	str2 = str.substring(str1.length, str.length);
	
	seconddot = str2.indexOf(".");

	if ((firstdot == firstdot + seconddot) || (seconddot == -1) || (seconddot + firstdot == strlen - 1) || (str.indexOf("www.") == -1))
	{
		return false;
	}
	else
	{
		return true;
	}
}//end webaddress() 

//function to check the image type
function checkImage(val)
{
	if (val == "")
	{
		alert ("Click on Browse to select an image.");
		return false;
	}
	else
	{
		var d = val;
		if (d.lastIndexOf('\\') > 0)
			d = d.substring((d.lastIndexOf('\\')+1))
				i=d.length;
			j=(i-4)
			var h=d.substring(i,j);
			var h1=h.toLowerCase();
		if ((h1.lastIndexOf('.jpg') < 0) && (h1.lastIndexOf('.gif') < 0) && (h1.lastIndexOf('.jpeg') < 0) && (h1.lastIndexOf('.jpe') < 0))
		{
			alert("Invalid file format. Please select a jpg or gif file.");
			//document.dd.ClubImage.value="";
			//document.dd.ClubImage.focus();
			return false;
		}
		return true;
	}
} // end function to check image type

function isEDate(dtStr){
	//alert(dtStr)
	var daysInMonth = DaysArray(12);
	var pos1=dtStr.indexOf(dtCh);
	var pos2=dtStr.indexOf(dtCh,pos1+1);
	var strDay=dtStr.substring(0,2);
	var strMonth=dtStr.substring(3,5);
	var strYear=dtStr.substring(6);
	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");
		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;
}//end isEDate()


//function to check date in yyyy-mm-dd format
function checkDate(theFld){
	//theFld = document.frmSearch.datefrom;
	theVal = theFld.split('-')
	theMsg = "";
	if(theVal.length!=3)
	  theMsg = 'Enter date like this: YYYY-MM-DD';
	else {
	  theDate = new Date(theVal[0],(theVal[1]*1-1),theVal[2])
	  if(theDate.getYear()!=(theVal[0]*1))
		theMsg = 'Enter Year as four digits';
	  if(theDate.getMonth()!=(theVal[1]*1-1))
		theMsg += '\nEnter Month as two digits';
	  if(theDate.getDate()!=(theVal[2]*1))
		theMsg += '\nEnter Day as two digits';
	}
	if(theMsg!="") {
	  //alert(theMsg)
	  //theFld.focus();
	  //theFld.select();
	  return false;
	}
	else
	{
		return true;
	}
}

function compareDate(formelement1, formelement2) {
	// returns
	// if date1 < date2 return -1
	// if date1 == date2 return 0
	// if date1 > date2 return 1
	var dtStr1 = formelement1.value;
	var dtStr2 = formelement2.value;
	/*if (dtStr1=="") {
		alert("date field is blank");
		formelement1.focus();
		return false;
	}
	if (dtStr2=="") {
		alert("date field is blank");
		formelement2.focus();
		return false;
	}*/

	var strDay1=dtStr1.substring(3,5);
	var strMonth1=dtStr1.substring(0,2);
	var strYear1=dtStr1.substring(6);
	var strDay2=dtStr2.substring(3,5);
	var strMonth2=dtStr2.substring(0,2);
	var strYear2=dtStr2.substring(6);
	var dt1 = new Date(strMonth1,strDay1,strYear1);
	var dt2 = new Date(strMonth2,strDay2,strYear2);
	if ((dt1 - dt2) < 0) return -1;
	if ((dt1 - dt2) == 0) return 0;
	if ((dt1 - dt2) > 0) return 1;
}

//Know Creating function for checking for sqlijection

function CheckSqlIjection(strfrmelement,strValue)
			{
				
			var st_return_value ;
			st_return_value = "";
		    var b=strfrmelement.value.toLowerCase();

		
			
			var myString ="--,;,/*,*/,@@,@,char,nchar,varchar,nvarchar,alter,begin,cast,create,cursor,declare,delete,drop,end,exec,execute,fetch,insert,kill,open,select,sys,sysobjects,syscolumns,table,update";
			  var mySplitResult = myString.split(",");
		
			   for(i = 0; i < mySplitResult.length; i++){
			   			if(mySplitResult[i] == b)
										{
										
									       alert( "Invalid Request " + strValue)
										     strfrmelement.focus();
											 st_return_value = "1"
											return false;
										}
									 }
									 
									 if(st_return_value == "1")
									 	{
											 return false;
										}
										else
										{
											return true;
										}
										
			}




		
			<!--Now creating function for javavalidation for special character-->


function checkSpecialChar2(strfrmelement,strValue)	
{
	
		var st_return_value = "0";
			st_return_value = "";
		    var b=strfrmelement.value.toLowerCase();
	       var mySplitResulttxvalue = b.split(" ");
		
			
			var myString ="',varchar,--,;,/*,*/,@@,@,char,nchar,nvarchar,alter,begin,cast,create,cursor,declare,delete,drop,end,exec,execute,fetch,insert,kill,open,select,sys,sysobjects,syscolumns,table,update";
			  var mySplitResult = myString.split(",");

			   for(j = 0; j < mySplitResulttxvalue.length; j++) {
			
				   for(i = 0; i < mySplitResult.length; i++)
					                 {
										 var valueoftxt = mySplitResulttxvalue[j]
										
			   			if(mySplitResult[i] == valueoftxt)
										{
								             alert(  valueoftxt  +" is Reserved word")
										     strfrmelement.focus();
											 st_return_value = "1"
											 return false;
										}
									 }
										
										
										
									 }


                                                                    if(SplCheckSqlIjection(strfrmelement)==false)
 										{
										
											st_return_value == "1"
    										 return false;
 										}





									 
									 if(st_return_value == "1")
									 	{
											 return false;
										}
										else
										{
											return true;
										}
		
}


//Now Checking for Special Character


function SplCheckSqlIjection(strfrmelement)
			{
				
	var st_return_value = "";			
	var a=strfrmelement.value;
    var b=a.length;
    var cha="~!@#$%^&*()+-[]{}/|\"';:,<>";
    var ch=cha.length;
    var i,j;
    for(i=0;i<ch;i++)
    {
      var ch1=cha.substring(i,i+1);
       for(j=0;j<b;j++)
       {
          var a1=a.substring(j,j+1);
           if(a1==ch1)
              {
alert("~!@#$%^&*()+-[]{}/|\"';:,<> are not allowed");
               strfrmelement.focus();
				st_return_value == "1"
                return false;
               }
         }
     }
	
			  if(st_return_value == "1")
									 	{
											 return false;
										}
										else
										{
											return true;
										}	
				
				
			
										
			}
		







<!---ends here-->