// Original Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
//
// You may incorporate this Apple sample code into your own code
// without restriction. This Apple sample code has been provided "AS IS"
// and the responsibility for its operation is yours. You may redistribute
// this code, but you are not permitted to redistribute it as
// "Apple sample code" after having made changes.
//
// This particular version has been pretty heavily modified for use by
// Saugus.net.


// email

function checkEmail(strng)
{
  var error="";
  if (strng == "")
  {
    error = "You didn't enter an e-mail address.\n";
  }
  var emailFilter=/^.+@.+\..{2,3}$/;
  if (!(emailFilter.test(strng)))
  { 
    error = "Please enter a valid e-mail address.\n";
  }
  else
  {
    //test email for illegal characters
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
    if (strng.match(illegalChars))
    {
      error = "The e-mail address contains illegal characters.\n";
    }
  }
  return error;    
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone(strng)
{
  var error = "";
  if (strng == "")
  {
    error = "You didn't enter a phone number.\n";
  }
  var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
  if (isNaN(parseInt(stripped)))
  {
     error = "The phone number contains illegal characters.";

  }
  if (!(stripped.length == 10))
  {
      error = "The phone number is the wrong length. Make sure you included an area code.\n";
  } 
  return error;
}


// ZIP code - strip out delimiters and check for either 5 or 9 digits

function checkZipCode(strng)
{
  var error = "";
  if (strng == "")
  {
    error = "You didn't enter a ZIP code.\n";
  }
  var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
  if (isNaN(parseInt(stripped)))
  {
     error = "The ZIP code contains illegal characters.";

  }
  if (!(stripped.length == 5)&&!(stripped.length == 9))
  {
      error = "The ZIP code is the wrong length.\n";
  } 
  return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword(strng)
{
  var error = "";
  if (strng == "")
  {
    error = "You didn't enter a password.\n";
  }
  var illegalChars = /[\W_]/; // allow only letters and numbers    
  if ((strng.length < 6) || (strng.length > 8))
  {
     error = "The password is the wrong length.\n";
  }
  else if (illegalChars.test(strng))
  {
    error = "The password contains illegal characters.\n";
  } 
  else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/))))
  {
    error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
  }  
  return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername(strng)
{
  var error = "";
  if (strng == "")
  {
     error = "You didn't enter a username.\n";
  }
  var illegalChars = /\W/; // allow letters, numbers, and underscores
  if ((strng.length < 4) || (strng.length > 10))
  {
    error = "The username is the wrong length.\n";
  }
  else if (illegalChars.test(strng))
  {
    error = "The username contains illegal characters.\n";
  } 
  return error;
}       


// non-empty textbox

function isEmpty(strng)
{
  var error = "";
  if (strng.length == 0)
  {
     error = "The mandatory text area has not been filled in.\n"
  }
  return error;     
}


// was textbox altered

function isDifferent(strng)
{
  var error = ""; 
  if (strng != "Can\'t touch this!")
  {
    error = "You altered the inviolate text area.\n";
  }
  return error;
}


// exactly one radio button is chosen

function checkRadio(checkvalue)
{
  var error = "";
  if (!(checkvalue))
  {
     error = "Please check a radio button.\n";
  }
  return error;
}


// valid selector from dropdown list

function checkDropdown(choice)
{
  var error = "";
  if (choice == 0)
  {
    error = "You didn't choose an option from the drop-down list.\n";
  }    
  return error;
}