// Declaring valid date character, minimum year and maximum year
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)
	}
	
	day=parseInt(strDay)
	month=parseInt(strMonth)
	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 ValidateForm(){
	var dt=document.career.dob
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
    return true
 }

 
function isNumberKey(evt)
{
 var charCode = (evt.which) ? evt.which : event.keyCode
 if (charCode > 31 && (charCode < 48 || charCode > 57))
 {
     alert("Please enter only numbers");
    return false;
}
}
 

function validateFileExtension(fld)

 {
	if(!/(\.txt|\.doc|\.pdf|\.txt)$/i.test(fld.value))
	 {
		alert("Please upload valid document format resume.");
		file.career.reset();
		file.focus();
		return false;
	}
	return true;
	
	
}
 
function check()
 {
	var s=document.career;
	var mobile_len = s.mobile.value;
	 
	
	if(s.tit.value=="select")
	{
	alert ("Please select your title");
	s.tit.focus()
	return false;
	}
	
	
	if(s.f_name.value=="")
	{
	alert ("Please enter your first name");
	s.f_name.focus()
	return false;
	}
	
	 
	 if(s.dob.value=="")
	{
	alert ("Please enter your Date of Birth");
	s.dob.focus()
	return false;
	}
	
	if(s.dob.value != "" && !ValidateForm(s.dob))
	{
		 
		s.dob.focus()
		return false;
		
	}
	
	 if(s.gender[0].checked == false && s.gender[1].checked == false){
       alert("Please select Gender");
       return false;
 }

	
	if(s.email.value=="")
	{
	alert ("Please enter a valid E-mail address");
	s.email.focus()
	return false;
	}
	 
	 if (s.email.value.indexOf("@")<1 ||
    	s.email.value.indexOf(".")==-1 ||
    	s.email.value.indexOf(",")!=-1 ||
    	s.email.value.indexOf(" ")!=-1 ||
    	s.email.value.length<6)
  {
    alert("Please enter a valid E-mail address.\n" +
    "Example: name@gmail.com");
     s.email.focus();
     return false;
  }
 
	if(s.phone.value == "" && s.mobile.value == "") 
	{
		alert("Please enter either Landline Phone or Mobile Phone Number or both!");
		s.mobile.focus();
		return false;
	}
	 
	
	if(mobile_len.length != 10) {
		alert("Enter valid Mobile Phone Number!");
		s.mobile.focus();
		return false;
	} 
 	 
    
	
   	
	if(s.add.value=="")
	{
	alert ("Please enter your current address");
	s.add.focus()
	return false;
	}
	 
	if(s.ug.value=="select")
	{
	alert ("Please select your U.G Qualification");
	s.ug.focus()
	return false;
	}
 
	if(s.major.value=="select")
	{
	alert ("Please select the major subject");
	s.major.focus()
	return false;
	}
 
 	if(s.level.value=="select")
	{
	alert ("Please select your work level");
	s.level.focus()
	return false;
	}
	
	 
	
	if(s.exp_month.value=="select")
	{
	alert ("Please select your experience");
	s.exp_month.focus()
	return false;
	}
	 
	if(s.file.value == "")
					{
				       alert("Please upload document format resume.");
				        s.file.focus()
				        return false;
				    }
	 
				    
	
	if(s.file.value != "" && !validateFileExtension(s.file))
	{
		 
		s.file.focus()
		return false;
		
	}	  
				  
	 return true;

	
}