/* *********************************************
FORM VALIDATION ::: CONTACT US
********************************************* */
function formValidator(){
	// Make quick references to our fields
	var firstname = document.getElementById('firstname');
	var lastname = document.getElementById('lastname');
	var email = document.getElementById('email');
	var subject = document.getElementById('subject');
	var comments = document.getElementById('comments');
	
	// Check each input in the order that it appears in the form!
	if(notEmpty(firstname, "Please enter a valid First Name.")){
		if(notEmpty(lastname, "Please enter a valid Last Name.")){
			if(notEmpty(email, "Please enter a valid E-mail Address.")){
				if(emailValidator(email, "Please enter a valid E-mail Address.")){
					if(notEmpty(subject, "Please enter a valid Subject.")){
						return true;
					}
				}
			}
		}
	}
	return false;
}

/* *********************************************
FORM VALIDATION ::: REGISTRATION FORM 
********************************************* */
function formValidatorRegister(){
	// Make quick references to our fields
	var firstname = document.getElementById('firstname');
	var lastname = document.getElementById('lastname');
	var university = document.getElementById('university');
	var officeposition = document.getElementById('officeposition');
	
	// Check each input in the order that it appears in the form!
	if(notEmpty(firstname, "Please enter a valid First Name.")){
		if(notEmpty(lastname, "Please enter a valid Last Name.")){
			if(notEmpty(university, "Please enter a valid University Represented.")){
				if(notEmpty(officeposition, "Please enter a valid Office/Position.")){
					return true;
				}
			}
		}
	}
	return false;
}


/* *********************************************
FORM VALIDATION ::: CORE FUNCTIONS
********************************************* */
function notEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus(); // set the focus to this input
		return false;
	}
	return true;
}

function isNumeric(elem, helperMsg){
	var numericExpression = /^[0-9]+$/;
	if(elem.value.match(numericExpression)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function isAlphabet(elem, helperMsg){
	var alphaExp = /^[a-zA-Z]+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function isAlphanumeric(elem, helperMsg){
	var alphaExp = /^[0-9a-zA-Z]+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function lengthRestriction(elem, min, max){
	var uInput = elem.value;
	if(uInput.length >= min && uInput.length <= max){
		return true;
	}else{
		alert("Please enter between " +min+ " and " +max+ " characters");
		elem.focus();
		return false;
	}
}

function madeSelection(elem, helperMsg){
	if(elem.value == "Please Choose"){
		alert(helperMsg);
		elem.focus();
		return false;
	}else{
		return true;
	}
}

function emailValidator(elem, helperMsg){
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if(elem.value.match(emailExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}