// JScript File

function formValidator(){
	// Make quick references to our fields
	var firstname = document.getElementById('firstname');
	var lastname = document.getElementById('lastname');
	var email = document.getElementById('email');
	var phone = document.getElementById('phone');
	
	// Check each input in the order that it appears in the form!
	if(isAlphanumeric(lastname, "Please enter your last name with letters only")){
	    if(isAlphabet(firstname, "Please enter your first name with letters only")){
			if(phoneValidator(phone, "Please enter a valid home phone number")){
			    if (notEmpty(phone,"Please enter a valid home phone number")){
			        if (email!=null){
			            if (notEmpty(phone,"Please enter a valid home phone number")){
				            if(emailValidator(email, "Please enter a valid email address")){
					            return true;
					        }
				        }
				        else
				        {
				            return true;
				        }    
				    }
				}
			}
		}
	}
	
	
	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 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 phoneValidator(elem, helperMsg) {
    var stripped = elem.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (elem.value == "") {
		alert(helperMsg);
		elem.focus();
		return false;
    } else if (isNaN(parseInt(stripped))) {
		alert(helperMsg);
		elem.focus();
		return false;
    } else if (!(stripped.length == 10)) {
		alert(helperMsg);
		elem.focus();
		return false;
    } else{
        return true;
    }
}