// JavaScript Document

function formValidator(){
	// Make quick references to our fields
	var firstname = document.getElementById('firstname');
	var lastname= document.getElementById('lastname');
	var zipcode = document.getElementById('zipcode');
	var birthday = document.getElementById('birthday');
	var email = document.getElementById('email');
	var confirmemail = document.getElementById('confirmemail');
	
	// Check each input in the order that it appears in the form!
	if(notEmpty(firstname, "Please enter your first name.")){
		if(isName(firstname, "Please enter only letters for your first name.")){
			if(notEmpty(lastname, "Please enter your last name.")){
				if(isName(lastname, "Please enter only letters for your name")){
					if(emailValidator(email, "Please enter a valid email address")){
						if(emailConfirm(confirmemail, "The email addresses do not match")){
							if(isNumeric(zipcode, "Please enter a valid zip code")){
								if(notEmpty(birthday, "Please enter a valid birthday")){	
									return true;
									document.getElementById('form').submit();
								}
							}
						}
					}
				}
			}
		}
	}
	return false;
}

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 isName(elem, helperMsg){
	var alphaExp = /^[\s0-9a-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;
	}
}

function emailConfirm(elem, helperMsg){
	if(document.getElementById('email').value == document.getElementById('confirmemail').value){
		//alert("emails match");
		return true;
	}
	else{
		alert(helperMsg);
		elem.focus;
		return false;
	}
}