window.onload = initForms;

function initForms()
{
	for (var i=0; i< document.forms.length; i++)
	{
		document.forms[i].onsubmit = function()
		{
			return validForm();
		}
	}
	document.getElementById("sunroof").onclick = doorSet;
	/*line above only necessary if add in conditional checkboxes.
	connected to doorSet function below*/
}

function validForm()
{
	var allGood = true;
	var allTags = document.getElementsByTagName("*");
	
	for (var i=0; i<allTags.length; i++)
	{
		if (!validTag(allTags[i]))
		{
			allGood = false;
		}
	}
	return allGood;
	
	function validTag(thisTag)
	{
		var outClass = "";
		var allClasses = thisTag.className.split(" ");
		
		for (var j=0; j<allClasses.length; j++)
		{
			outClass += validBasedOnClass(allClasses[j]) + " ";
		}
		
		thisTag.className = outClass;
		
		if (outClass.indexOf("invalid") > -1)
		{
			invalidLabel(thisTag.parentNode);
			thisTag.focus();
			if (thisTag.nodeName == "INPUT")
			{
				thisTag.select();
			}
			return false;
		}
		return true;
		
		function validBasedOnClass(thisClass)
		{
			var classBack = "";
			
			switch(thisClass)
			{
				case "":
				case "invalid":
					break;
				case "reqd":
					if (allGood && thisTag.value == "")
					{
						classBack = "invalid ";
					}
					classBack += thisClass;
					break;
				case "radio":
					if (allGood && !radioPicked(thisTag.name))
					{
						classBack = "invalid ";
					}
					classBack += thisClass;
					break;
				case "email":
					if (allGood && !validEmail(thisTag.value))
					{
						classBack = "invalid ";
					}
					classBack += thisClass;
					break;
				default:
					if (allGood && !crossCheck(thisTag,thisClass))
					{
						classBack = "invalid ";
					}
					classBack += thisClass;
			}
			return classBack;
		}
		
		function validEmail(email)
		{
			var invalidChars = " /:,;";
			
			if (email == "")
			{
				return false;
			}
			
			for (var k=0; k<invalidChars.length; k++)
			{
				var badChar = invalidChars.charAt(k);
				if (email.indexOf(badChar) > -1)
				{
					return false;
				}
			}
			
			var atPos = email.indexOf("@",1);
			if (atPos == -1)
			{
				return false;
			}
			if (email.indexOf("@", atPos+1) != -1)
			{
				return false;
			}
			var periodPos = email.indexOf(".",atPos);
			if (periodPos+3 > email.length)
			{
				return false;
			}
			return true;
		}
		
		function crossCheck(inTag,otherFieldID)
		{
			if (!document.getElementById(otherFieldID))
			{
				return false;
			}
			return (inTag.value == document.getElementById(otherFieldID).value);
		}
		
		function radioPicked(radioName)
		{
			var radioSet = "";
			
			for (var k=0; k<document.forms.length; k++)
			{
				if (!radioSet) 
				{
					radioSet = document.forms[k][radioName];
				}
			}
			if (!radioSet)
			{
				return false;
			}
			
			for (k=0; k<radioSet.length; k++)
			{
				if (radioSet[k].checked)
				{
					return true;
				}
			}
			return false;
		}
		
		function invalidLabel(parentTag)
		{
			if (parentTag.nodeName == "LABEL")
			{
				parentTag.className += " invalid";
			}
		}
		
	}
}
/*doorSet function only necessary if add in conditional checkboxes.
connected to "sunroof" above*/
function doorSet()
{
	if (this.checked)
	{
		document.getElementById("twoDoor").checked = true;
	}
}