//
// field_validation.js
//
// Usage:
//	<script src="field_validation.js" Language="JavaScript"></script>
//	<form name="TEST" method="post" action="index.php" onsubmit="return(validateForm(document.TEST))">
//
// Customize the validateForm() method below to validate the individual fields
//
// --------------------------------------------------------

function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}

	return result;
}

function validRequiredEitherSelect(formField, formField2, fieldLabel, condition)
{
	var result = true;
	
	if ( condition == false)
		return true;
	else
	{
		if ((formField.options.selectedIndex <= 0) && (formField2.value == ""))
		{
			alert('Please provide a value for the ' + fieldLabel +' field.');
			formField.focus();
			result = false;
		}
	}
	return result;
}

function validDropDown(formField,fieldLabel)
{
	var result = true;
	if (formField.selectedIndex == 0)
	{
		alert('Please select a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}

	return result;
}
function validIsChecked(formField,fieldLabel)
{
	var result = true;
	if (!formField.checked)
	{
		alert('You must check the "' + fieldLabel +'" field to continue.');
		formField.focus();
		result = false;
	}

	return result;
}
function validRadioRequired(formField, fieldLabel)
{
	var result = false;
	var iLength = formField.length;
	for (i = 0; i < iLength; ++i)
	{
		if (formField[i].checked)
		{
			result = true;
		}
	}
	if (!result)
	{
		alert('You must select one of the options in the "' + fieldLabel +'" field to continue.');
	}
	
	return result;
}
function allDigits(str)
{
	return inValidCharSet(str,"0123456789.");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}

	return result;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
	
	if (!required && formField.value == '')
	{
		result = true;
	}
	else if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		formField.focus();
		result = false;
	}

  return result;

}

function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
	}

	return result;
}

function GreaterThanZero(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
		else
		{
			if (formField.value <= 0)
			{
				alert(fieldLabel + ' must be greater than zero.');
				formField.focus();
				result = false;
			}
		}
	}

	return result;
}

function GreaterThan(formField1,fieldLabel1,formField2,fieldLabel2)
{
	var result = true;
	if (formField1.value > formField2.value)
	{
		alert(fieldLabel1 + ' can not be greater than ' + fieldLabel2);
		formField1.focus();
		result = false;
	}
	return result;
}

function validInt(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		var num = parseInt(formField.value,10);
 		if (isNaN(num))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
	}

	return result;
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

 	if (result)
 	{
 		var elems = formField.value.split("/");

 		result = (elems.length == 3); // should be three components

 		if (result)
 		{
 			var month = parseInt(elems[0],10);
  			var day = parseInt(elems[1],10);
 			var year = parseInt(elems[2],10);
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}

  		if (!result)
 		{
 			alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();
		}
	}

	return result;
}