//FORM VALIDATION///////////////////////////////////////////////////////////////////////////////////////

// "t" = TEXTBOX OR TEXTAREA
// "r" = RADIO BUTTONS
// "s" = SELECT BOX (DROP-DOWN MENU)
// "#" = SOCIAL SECURITY NUMBER
// "n" = NUMBER in TEXTBOX
// "d" = DATE
// "z" = ZIP
// "e" = EMAIL
// "p" = PHONE OR FAX
// "x" = NUMBER IN TEXT BOX THAT IS NOT REQUIRED
// "w" = WEB ADDRESS

var validateCounter
var myElement

function validate(swap){
	myform=swap
	mySwitch=true
	counter=0
	formTemp=""
	for(validateCounter=0;validateCounter<myform.length;validateCounter++){
		if(myform.elements[validateCounter].name.charAt(2)=="-"){
			myElement=myform.elements[validateCounter].name
			if(myElement.charAt(1)=="y"){isReq = true}else{isReq = false}
			if(myElement.charAt(0)=="t"){validateText(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="r"){validateRadio(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="s"){validateSelect(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="#"){validateSocSec(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="n"){validateNumber(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="x"){validateNumber(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="d"){validateDate(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="y"){validateDate(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="z"){validateZip(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="e"){validateEmail(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="p"){validatePhone(myform.elements[validateCounter],isReq)}
			else if(myElement.charAt(0)=="w"){validateWeb(myform.elements[validateCounter],isReq)}
		}
		if(!mySwitch){break}
	}
	return mySwitch
}


//TEXTBOX////////////////////////////////////////////////////////////////////////////////////////////////

function validateText(myElement,isreq){
if(myElement.value==""){
	alert("Please fill in this field as it is required.")
	myElement.focus()
	mySwitch = false
	}
}

//WEB ADDRESS////////////////////////////////////////////////////////////////////////////////////////////////

function validateWeb(myElement,isreq){
	webaddress = myElement.value.toLowerCase()
	if(isreq && webaddress=="") {
		alert("Please fill in this field as it is required.")
		myElement.focus()
		mySwitch = false
	}
	else if(webaddress!="" && webaddress.substring(0,4)!="www."){
		alert("Certain characters required for a valid web address are missing in this field.")
		myElement.focus()
		mySwitch = false
	}
}

//PHONE//////////////////////////////////////////////////////////////////////////////////////////

function validatePhone(myElement,isreq){
	if ((isreq || myElement.value != "") && (!isPhone(myElement.value))) {
		myElement.focus()
		mySwitch = false
	}
}

function isPhone(phStr){
	var phCh= "(";
	var phCh2= ")";
	var phCh3= "-";
	var phCh4= " ";
	var delims = phCh + phCh2 + phCh3 + phCh4
	var pos1=phStr.indexOf(phCh)
	var pos2=phStr.indexOf(phCh2,pos1+1)
	var pos3=phStr.indexOf(phCh4,pos2+1)
	var pos4=phStr.indexOf(phCh3,pos3+1)
	var strPh1=phStr.substring(pos1+1,pos2)
	var strPh2=phStr.substring(pos3,pos4)
	var strPh3=phStr.substring(pos4+1)
	if (strPh1.length<3 || strPh2.length<3 || strPh3.length<4){
		alert("The phone/fax format should be : (999) 999-9999")
		mySwitch = false
	}
	if (phStr.length != 14 || isInteger(stripCharsInBag(phStr, delims))==false){
		alert("The phone/fax format should be : (999) 999-9999")
		mySwitch = false
	}
	return true
}

//VALIDATE SPECIFIC CHARACTERS///////////////////////////////////////////////////////////////////

function charCheck(myElement, swap){
for(var i=0;i<myElement.length;i++){
	if(myElement.charAt(i)==swap){
		return true
		}
	}
}

//EMAIL//////////////////////////////////////////////////////////////////////////////////////////////

function validateEmail(myElement,isreq){
if(myElement.value=="" && isreq){
	alert("Please enter an email address as it is required.")
	myElement.focus()
	mySwitch = false
	}
else if(myElement.value!="" && !charCheck(myElement.value,"@")){
	alert("Certain characters required for a valid email address are missing in this field.")
	myElement.focus()
	mySwitch = false
	}
else if(myElement.value!="" && !charCheck(myElement.value,".")){
	alert("Certain characters required for a valid email address are missing in this field.")
	myElement.focus()
	mySwitch = false
	}
}

//ZIP//////////////////////////////////////////////////////////////////////////////////////////////////

function validateZip(myElement,isreq){
	if(isreq && myElement.value == ""){
		alert("Please enter a zip code as it is required.")
		myElement.focus()
		mySwitch = false
	}
	if(isNaN(myElement.value != "" && myElement.value)){
		alert("Please re-enter this Zip Code using ONLY numerals.")
		myElement.focus()
		myElement.value=""
		mySwitch = false
	}
	else if(myElement.value != "" && charCount(myElement.value, 5)){
		alert("Five (5) numerals are required for this field.")
		myElement.focus()
		mySwitch = false
	}
}

//DATE////////////////////////////////////////////////////////////////////////////////////////////////

function validateDate(myElement,isreq){
	if ((isreq || myElement.value != "") && (!isDate(myElement.value))) { 
		myElement.focus()
		mySwitch = false
	}
}

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
}

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"))) mySwitch = 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
}

//NUMBER////////////////////////////////////////////////////////////////////////////////////////////

function validateNumber(myElement,required){
	if(myElement.value==""){
		if(required){ 
			alert("Please fill in this field as it is required.")
			myElement.focus()
			mySwitch = false
		}
	}
	else{
		if(isNaN(myElement.value)) {
			alert("Please re-enter using ONLY numerals.")
			myElement.value=""
			myElement.focus()
			mySwitch = false
		}
	}
}

//COUNT THE CHARACTERS////////////////////////////////////////////////////////////////////////////////

function charCount(myElement, swap){
if(myElement.length!=swap){
	return true
	}
}

//SOCIAL SECURITY NUMBERS//////////////////////////////////////////////////////////////////////////////

function validateSocSec(myElement,isreq){
if(isreq && myElement.value == ""){
		alert("Please enter a Social Security Number as it is required.")
		myElement.focus()
		mySwitch = false
	}	
else if(myElement.value != "" && isNaN(myElement.value)){
	alert("Please re-enter this Social Security Number using ONLY numerals.")
	myElement.focus()
	myElement.value=""
	mySwitch = false
	}
else if(myElement.value != "" && charCount(myElement.value, 9)){
	alert("Nine (9) numerals are required for this field.")
	myElement.focus()
	mySwitch = false
	}
}

//SELECT / DROPDOWN MENUS///////////////////////////////////////////////////////////////////////////////

function validateSelect(myElement){
	if(myElement.selectedIndex==0){
		alert("Please make a selection from this dropdown menu as it is required.")
		myElement.focus()
		mySwitch = false
	}
}