// create object
function formValidator()
{
  // set up array to hold error messages
  this.errorList = new Array;
  
  // set up object methods
  this.isEmpty = isEmpty;
  this.isNumber = isNumber;
  this.isAlphabetic = isAlphabetic;
  this.isAlphaNumeric = isAlphaNumeric;
  this.isWithinRange = isWithinRange;
  this.isEmailAddress = isEmailAddress;
  this.isChecked = isChecked;
  this.isRadioSelected = isRadioSelected;
  this.raiseError = raiseError;
  this.numErrors = numErrors;
  this.displayErrors = displayErrors;
  
}

// check to see if input is whitespace only or empty
function isEmpty(val)
{
  if (val.match(/^\s+$/) || val == "")
  {
    return true;
  } else {
    return false;
  }
}

// check to see if input is number
function isNumber(val)
{
  if (isNaN(val))
  {
    return false;
  } else {
    return true;
  }
}

// check to see if input is alphabetic
function isAlphabetic(val)
{
  if (val.match(/^[a-zA-Z]+$/))
  {
    return true;
  } else {
    return false;
  }
}

// check to see if input is alphanumeric
function isAlphaNumeric(val)
{
  if (val.match(/^[a-zA-Z0-9]+$/))
  {
    return true;
  } else {
    return false;
  }
}

// check to see if value is within range
function isWithinRange(val, min, max)
{
  if (val >= min && val <= max)
  {
    return true;
  } else {
    return false;
  }
}

// check to see if input is a valid email address
function isEmailAddress(val)
{
  if (val.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\.name)|(\.biz)|(\.info)|(\.pro)|(\.aero)|(\..{2,2}))$)\b/gi))
  // (/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i))
  {
    return true;
  } else { 
    return false;
  }
}

// check to see if form value is checked
function isChecked(obj)
{
  if (obj.checked)
  {
    return true;
  } else {
    return false;
  }
}

// check to see if form value is checked
function isRadioSelected(obj)
{
  if (obj[0])
  {
    for (var i=0; i<obj.length; i++) {
      if (obj[i].checked) {
        return true;
      }
    }
  } else {
    if (obj.checked)
    {
      return true;
    } else {
      return false;
    }
  }
}

// display all errors
// iterate through error array and print each item
function displayErrors()
{
  for (x = 0; x < this.errorList.length; x++)
  {
    alert("Error: " + this.errorList[x]);
  }
}

// add an error to error list
function raiseError(msg)
{
  this.errorList[this.errorList.length] = msg;
}

// return number of errors in error array
function numErrors()
{
  return this.errorList.length;
}
// end object