// 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.

// email

function checkEmail (strng, div) {
var error="";
var emailFilter=/^.+@.+\..{2,3}$/;
var illegalChars= /[\(\)\<\>\,\;\:\\\/\"\[\]]/;
	if (strng == "") {
	   error = "You didn't enter an email address.<br />";
	    document.getElementById(div).style.display ='inline';
	    document.getElementById(div).innerHTML = error;
	}
	else{
	       document.getElementById(div).style.display ='none';
	    }

    if (!(emailFilter.test(strng))) { 
       error = "Please enter a valid email address.<br />";
        document.getElementById(div).style.display ='inline';
        document.getElementById(div).innerHTML = error;
    }
    else if (strng.match(illegalChars)){
		//test email for illegal characters
        error = "The email address contains illegal characters.<br />";
        document.getElementById(div).style.display ='inline';
        document.getElementById(div).innerHTML = error;
       }
    else{
       document.getElementById(div).style.display ='none';
    }
return error;    
}


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

function checkPhone (strng, div) {
var error = "";
if (strng == "") {
   error = "You didn't enter a phone number.<br />";
    document.getElementById(div).style.display ='inline';
    document.getElementById(div).innerHTML = error;
}
else{
       document.getElementById(div).style.display ='none';
    }

var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
    if (isNaN(parseInt(stripped))) {
       error = "The phone number contains illegal characters.<br />";
	   document.getElementById(div).style.display ='inline';
	   document.getElementById(div).innerHTML = error;
    }
    else{
       document.getElementById(div).style.display ='none';
    }
    if (!(stripped.length == 10)) {
	error = "The phone number is the wrong length. Make sure you included an area code.<br />";
	 document.getElementById(div).style.display ='inline';
     document.getElementById(div).innerHTML = error;
    } 
    else{
       document.getElementById(div).style.display ='none';
    }
return error;
}


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

function checkPassword (strng, div) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.<br />";
    document.getElementById(div).style.display ='inline';
    document.getElementById(div).innerHTML = error;
}
else{
       document.getElementById(div).style.display ='none';
    }

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 10)) {
       error = "The password is the wrong length. Please select between 6 and 8 characters<br />";
        document.getElementById(div).style.display ='inline';
        document.getElementById(div).innerHTML = error;
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.<br />";
      document.getElementById(div).style.display ='inline';
      document.getElementById(div).innerHTML = error;
    } 
    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.<br />";
        document.getElementById(div).style.display ='inline';
        document.getElementById(div).innerHTML = error;
    }  
    else{
       document.getElementById(div).style.display ='none';
    }
return error;    
}    


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

function checkUsername (strng, div) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.<br />";
   document.getElementById(div).style.display ='inline';
   document.getElementById(div).innerHTML = error;
}
else{
       document.getElementById(div).style.display ='none';
    }

    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 10)) {
       error = "The username is the wrong length.<br />";
       document.getElementById(div).style.display ='inline';
          document.getElementById(div).innerHTML = error;
    }
    else if (illegalChars.test(strng)) {
    error = "The username contains illegal characters.<br />";
     document.getElementById(div).style.display ='inline';
        document.getElementById(div).innerHTML = error;
    } 
    else{
       document.getElementById(div).style.display ='none';
    }
return error;
}       


// non-empty textbox

function isEmpty(strng, div) {
	var error = "";
	  if (strng.length == 0) {
	     error = "The mandatory text area has not been filled in.<br />";
	     document.getElementById(div).style.display ='inline';
	     document.getElementById(div).innerHTML = error;
	  }
	  else{
       document.getElementById(div).style.display ='none';
    }
	return error;	  
}

// was textbox altered

function isDifferent(strng, div) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.<br />";
     document.getElementById(div).style.display ='inline';
          document.getElementById(div).innerHTML = error;
  }
  else{
       document.getElementById(div).style.display ='none';
    }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue, div) {
var error = "";
   if (!(checkvalue)) {
       error = "Please check a radio button.<br />";
       document.getElementById(div).style.display ='inline';
          document.getElementById(div).innerHTML = error;
    }
    else{
       document.getElementById(div).style.display ='none';
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice, div) {
var error = "";
    if (choice == 0) {
    error = "You didn't choose an option from the drop-down list.<br />";
    document.getElementById(div).style.display ='inline';
    document.getElementById(div).innerHTML = error;
    }  
    else{
       document.getElementById(div).style.display ='none';
    }  
return error;
}    

function checkZip(field, div) {
var valid = "0123456789-";
var hyphencount = 0;
var error = "";
		if (field.length!=5 && field.length!=10) {
			error = "Please enter your 5 digit or 5 digit+4 zip code.<br />";
			document.getElementById(div).style.display ='inline';
			document.getElementById(div).innerHTML = error;
		} else{
       document.getElementById(div).style.display ='none';
    } 
		for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
		if (temp == "-") hyphencount++;
		if (valid.indexOf(temp) == "-1") {
			error = "Invalid characters in your zip code.  Please try again.<br />";
			document.getElementById(div).style.display ='inline';
			document.getElementById(div).innerHTML = error;
		} else{
       document.getElementById(div).style.display ='none';
    } 
		if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
			error = "The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'.   Please try again.<br />";
			 document.getElementById(div).style.display ='inline';
			document.getElementById(div).innerHTML = error;
		   } else{
       document.getElementById(div).style.display ='none';
    } 
		}
		return error;
}

function validateZIP(field) {
var valid = "0123456789-";
var hyphencount = 0;

if (field.length!=5 && field.length!=10) {
alert("Please enter a 5 digit or 5 digit+4 zip code.");
return false;
}
for (var i=0; i < field.length; i++) {
temp = "" + field.substring(i, i+1);
if (temp == "-") hyphencount++;
if (valid.indexOf(temp) == "-1") {
alert("Invalid characters in this zip code.  Please try again.");
return false;
}
if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
alert("The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'.   Please try again.");
return false;
   }
}
return true;
}



function IsNumeric(sText, div)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;
	var error = "";
 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         { 	error = "The content of the text field is not numeric!<br />";
         	document.getElementById(div).style.display ='inline';
   			 document.getElementById(div).innerHTML = error;
    }  
    else{
      		 document.getElementById(div).style.display ='none';
    }  
      }
   return error;
   
   }
   
  
// robust email validation
function emailCheck(emailStr) {

/* The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD.  1 means check it, 0 means don't. */

var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */

var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* The following pattern is used to check if the entered e-mail address
fits the user@domain format.  It also is used to separate the username
from the domain. */

var emailPat=/^(.+)@(.+)$/;

/* The following string represents the pattern for matching all special
characters.  We don't want to allow special characters in the address. 
These characters include ( ) < > @ , ; : \ " . [ ] */

var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

/* The following string represents the range of characters allowed in a 
username or domainname.  It really states which chars aren't allowed.*/

var validChars="\[^\\s" + specialChars + "\]";

/* The following pattern applies if the "user" is a quoted string (in
which case, there are no rules about which characters are allowed
and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
is a legal e-mail address. */

var quotedUser="(\"[^\"]*\")";

/* The following pattern applies for domains that are IP addresses,
rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
e-mail address. NOTE: The square brackets are required. */

var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

/* The following string represents an atom (basically a series of non-special characters.) */

var atom=validChars + '+';

/* The following string represents one word in the typical username.
For example, in john.doe@somewhere.com, john and doe are words.
Basically, a word is either an atom or quoted string. */

var word="(" + atom + "|" + quotedUser + ")";

// The following pattern describes the structure of the user

var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

/* The following pattern describes the structure of a normal symbolic
domain, as opposed to ipDomainPat, shown above. */

var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

/* Finally, let's start trying to figure out if the supplied address is valid. */

/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */

var matchArray=emailStr.match(emailPat);

if (matchArray==null) {

/* Too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */

alert("Email address seems incorrect (check @ and .'s)");
return false;
}
var user=matchArray[1];
var domain=matchArray[2];

// Start by checking that only basic ASCII characters are in the strings (0-127).

for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
alert("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Ths domain name contains invalid characters.");
return false;
   }
}

// See if "user" is valid 

if (user.match(userPat)==null) {

// user is not valid

alert("The username doesn't seem to be valid.");
return false;
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {

// this is an IP address

for (var i=1;i<=4;i++) {
if (IPArray[i]>255) {
alert("Destination IP address is invalid!");
return false;
   }
}
return true;
}

// Domain is symbolic name.  Check if it's valid.
 
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
alert("The domain name does not seem to be valid.");
return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
alert("The address must end in a well-known domain or two letter " + "country.");
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
alert("This address is missing a hostname!");
return false;
}

// If we've gotten this far, everything's valid!
return true;
}