// David Bromfield (bromfd@bellsouth.net)
// June 26,2002
//
// Use with an onSubmit form event (e.g. ONSUBMIT="return
// validateLikeCF(this)") to validate _required (text & select), _integer,
// _float, _range, and _date fields from the client side. Not _time or _eurodate.
//
// Follows field name syntax for basic CF server field validation so no extra
// coding is required.  Should lower traffic and CF server processing time
// by catching some validation errors before they leave the client.
// If something goes wrong on the client side, then the CF server is there to
// back up validation. Good luck.
//
// Req: javascript 1.2+
//
// Modified : Simon Haddon : 10/11/2003 : Include eurodate format checking
//                                        Include email checking

function validateLikeCF(input)
{
 var requiredFields = new Array(1);
 var requiredFieldsMsg = new Array(1);
 var integerFields = new Array(1);
 var integerFieldsMsg = new Array(1);
 var floatFields = new Array(1);
 var floatFieldsMsg = new Array(1);
 var rangeFields = new Array(1);
 var rangeFieldsVal = new Array(1);
 var rangeMinMsg = " must be greater than or equal to ";
 var rangeMaxMsg = " must be less than or equal to ";
 var rangeNumberMsg = " must be a number.";
 var startIndex = 0;
 var endIndex = 0;
 var dateFields = new Array(1);
 var dateFieldsMsg = new Array(1);
 var dateTest = new Date();
 var eurodateFields = new Array(1);
 var eurodateFieldsMsg = new Array(1);
 var eurodateTest = new Date();
 var emailFields = new Array(1);
 var emailFieldsMsg = new Array(1);
 var emailTest = new Date();
 var fieldCheck  = true;
 var fieldsErrorMsg = document.title + "\nForm Entry Error(s):\n\n";

 for (var fieldNum=0; fieldNum < input.elements.length; fieldNum++)
 {
  //Find required fields
  if (input.elements[input.elements[fieldNum].name + "_required"])
  {requiredFields[(requiredFields.length)] = input.elements[fieldNum].name;
   requiredFieldsMsg[(requiredFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_required"]).value;
  }
  //Find integer fields
  if (input.elements[input.elements[fieldNum].name + "_integer"])
  {integerFields[(integerFields.length)] = input.elements[fieldNum].name;
   integerFieldsMsg[(integerFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_integer"]).value;
  }
  //Find float fields
  if (input.elements[input.elements[fieldNum].name + "_float"])
  {floatFields[(floatFields.length)] = input.elements[fieldNum].name;
   floatFieldsMsg[(floatFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_float"]).value;
  }
  //Find range fields
  if (input.elements[input.elements[fieldNum].name + "_range"])
  {rangeFields[(rangeFields.length)] = input.elements[fieldNum].name;
   rangeFieldsVal[(rangeFieldsVal.length)] = (input.elements[input.elements[fieldNum].name + "_range"]).value;
  }
  //Find date fields
  if (input.elements[input.elements[fieldNum].name + "_date"])
  {dateFields[(dateFields.length)] = input.elements[fieldNum].name;
   dateFieldsMsg[(dateFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_date"]).value;
  }
  //Find euro date fields
  if (input.elements[input.elements[fieldNum].name + "_eurodate"])
  {eurodateFields[(eurodateFields.length)] = input.elements[fieldNum].name;
   eurodateFieldsMsg[(eurodateFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_eurodate"]).value;
  }
  //Find time fields
  if (input.elements[input.elements[fieldNum].name + "_time"])
  {timeFields[(dateFields.length)] = input.elements[fieldNum].name;
   timeFieldsMsg[(timeFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_time"]).value;
  }
  //Find email fields
  if (input.elements[input.elements[fieldNum].name + "_email"])
  {emailFields[(emailFields.length)] = input.elements[fieldNum].name;
   emailFieldsMsg[(emailFieldsMsg.length)] = (input.elements[input.elements[fieldNum].name + "_email"]).value;
  }
 }

 //Check required fields
 for (var fieldNum=1; fieldNum < requiredFields.length; fieldNum++)
 {
  if ((input.elements[requiredFields[fieldNum]].type == "text") || (input.elements[requiredFields[fieldNum]].type == "password"))
  {if (input.elements[requiredFields[fieldNum]].value.replace(/ /gi,"") == "")
   {fieldsErrorMsg += requiredFieldsMsg[fieldNum] + "\n";
    fieldCheck = false;
   }
  }
  else if ((input.elements[requiredFields[fieldNum]].type == "select-multiple") || (input.elements[requiredFields[fieldNum]].type == "select-one"))
  {if (input.elements[requiredFields[fieldNum]].selectedIndex == "-1")
   {fieldsErrorMsg += requiredFieldsMsg[fieldNum] + "\n";
    fieldCheck = false;
   }
  }
 }

 //Check integer fields 
 for (var fieldNum=1; fieldNum < integerFields.length; fieldNum++)
 {if (isNaN(Number(input.elements[integerFields[fieldNum]].value.replace(/,/gi,""),10)))
  {fieldCheck = false;
   fieldsErrorMsg += integerFieldsMsg[fieldNum] + "\n";
  }
//CF actually converts to integer
//  else
//  {input.elements[integerFields[fieldNum]].value = parseInt(input.elements[integerFields[fieldNum]].value.replace(/,/gi,""))
//  }
 }

 //Check float fields
 for (var fieldNum=1; fieldNum < floatFields.length; fieldNum++)
 {if (isNaN(Number(input.elements[floatFields[fieldNum]].value.replace(/,/gi,""))))
  {fieldCheck = false;
   fieldsErrorMsg += floatFieldsMsg[fieldNum] + "\n";
  }
//CF actually converts to float
//  else
//  {input.elements[floatFields[fieldNum]].value = parseFloat(input.elements[floatFields[fieldNum]].value.replace(/,/gi,""))
//  }
 }

 //Check range fields
 for (var fieldNum=1; fieldNum < rangeFields.length; fieldNum++)
 {if (isNaN(parseFloat(input.elements[rangeFields[fieldNum]].value.replace(/,/gi,""))))
  {fieldCheck = false;
   fieldsErrorMsg += input.elements[rangeFields[fieldNum]].name + rangeNumberMsg + "\n";
  }
  else
  {//Min check
   startIndex = rangeFieldsVal[fieldNum].toUpperCase().indexOf("MIN");
   if (startIndex != -1)
   {startIndex = rangeFieldsVal[fieldNum].indexOf("=",startIndex) + 1;
    endIndex = rangeFieldsVal[fieldNum].indexOf(" ",startIndex);
    if (endIndex == -1)
    {endIndex = rangeFieldsVal[fieldNum].length;
    }
    if (parseFloat(input.elements[rangeFields[fieldNum]].value) < parseFloat(rangeFieldsVal[fieldNum].slice(startIndex,endIndex)))
    {fieldsErrorMsg += "The value entered for " + input.elements[rangeFields[fieldNum]].name + rangeMinMsg + rangeFieldsVal[fieldNum].slice(startIndex,endIndex) + "\n";
     fieldCheck = false;
    }
   }

   //Max check
   startIndex = rangeFieldsVal[fieldNum].toUpperCase().indexOf("MAX");
   if (startIndex != -1)
   {startIndex = rangeFieldsVal[fieldNum].indexOf("=",startIndex) + 1;
    endIndex = rangeFieldsVal[fieldNum].indexOf(" ",startIndex);
    if (endIndex == -1)
    {endIndex = rangeFieldsVal[fieldNum].length;
    }
    if (parseFloat(input.elements[rangeFields[fieldNum]].value) > parseFloat(rangeFieldsVal[fieldNum].slice(startIndex,endIndex)))
    {fieldsErrorMsg += "The value entered for " + input.elements[rangeFields[fieldNum]].name + rangeMaxMsg + rangeFieldsVal[fieldNum].slice(startIndex,endIndex) + "\n";
     fieldCheck = false;
    }
   }
  }
 }

 //Check date fields
 for (var fieldNum=1; fieldNum < dateFields.length; fieldNum++)
 {dateTest.setTime(Date.parse(input.elements[dateFields[fieldNum]].value));
  if (isNaN(dateTest))
  {fieldCheck = false;
   fieldsErrorMsg += dateFieldsMsg[fieldNum] + "\n";
  }
//CF actually converts to ODBC date format
//  else
//  {input.elements[floatFields[fieldNum]].value = "{d '" + dateTest.getFullYear() + "-" + (dateTest.getMonth() + 1) + "-" + dateTest.getDate() + "'}"
//  }
 }

 //Check eurodate fields
 for (var fieldNum=1; fieldNum < eurodateFields.length; fieldNum++) {
  if (!chkdate(input.elements[dateFields[fieldNum]],'EU')) {
   fieldCheck = false;
   fieldsErrorMsg += dateFieldsMsg[fieldNum] + "\n";
  }
 }

 //Check email fields
 for (var fieldNum=1; fieldNum < emailFields.length; fieldNum++) {
  if (!validEmail(input.elements[emailFields[fieldNum]])) {
   fieldCheck = false;
   fieldsErrorMsg += emailFieldsMsg[fieldNum] + "\n";
  }
 }

 if (fieldCheck == true)
 {return true;
 }
 else
 {alert(fieldsErrorMsg);
  return false;
 }
}



function chkdate(objName, strDatestyle) {
//  var strDatestyle = "US"; //United States date style    mm/dd/yyyy
//  var strDatestyle = "EU";  //European date style;       dd/mm/yyyy
var strDate;
var strDateArray;
var strDay;
var strMonth;
var strYear;
var intday;
var intMonth;
var intYear;
var err = 0;
var booFound = false;
var datefield = objName;
var strSeparatorArray = new Array("/");
var intElementNr;
strDate = datefield.value;

  if (strDate.length != 10) {
    return false;
  }

  for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) {

    if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) {
      strDateArray = strDate.split(strSeparatorArray[intElementNr]);
      if (strDateArray.length != 3) {
        err = 1;
        return false;
      }
      else {
        strDay = strDateArray[0];
        strMonth = strDateArray[1];
        strYear = strDateArray[2];
      }
      booFound = true;
    }
  }

  if (booFound == false) {
    if (strDate.length>5) {
      strDay = strDate.substr(0, 2);
      strMonth = strDate.substr(2, 2);
      strYear = strDate.substr(4);
    }
  }

  if (strYear.length != 4) {
    return false;
  }
  // US style
  if (strDatestyle == "US") {
    strTemp = strDay;
    strDay = strMonth;
    strMonth = strTemp;
  }

  intday = parseInt(strDay, 10);
  if (isNaN(intday)) {
    return false;
  }

  intMonth = parseInt(strMonth, 10);
  if (isNaN(intMonth)) {
    err = 3;
    return false;
  }

  intYear = parseInt(strYear, 10);
  if (isNaN(intYear)) {
    return false;
  }

  if (intMonth>12 || intMonth<1) {
    return false;
  }

  if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 ||
     intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 ||
     intday < 1)) {
    return false;
  }
  if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11)
       && (intday > 30 || intday < 1)) {
    return false;
  }

  if (intMonth == 2) {
    if (intday < 1) {
      return false;
    }
    if (LeapYear(intYear) == true) {
      if (intday > 29) {
        return false;
      }
    }
    else {
      if (intday > 28) {
        return false;
      }
    }
  }
}

function LeapYear(intYear) {
  if (intYear % 100 == 0) {
    if (intYear % 400 == 0) {return true;}
  }
  else {
    if ((intYear % 4) == 0) {return true;}
  }
  return false;
}

function validEmail(eAddr)
{
var chkDot = true;
var usEmail = true;
var lenSuffix = (usEmail) ? 4 : 3;
var ndxAt = ndxDot =  0;
var emailval = eAddr;
var email = emailval.value;
/*

  ndxAt  = email.indexOf("@");
  ndxDot = email.indexOf(".") ;
  ndxDot2 = email.lastIndexOf(".") ;

  if (email == '') return true;
  if ((ndxDot < 0) || (ndxAt < 0)) return false;
  if (chkDot && (ndxDot < ndxAt) ) return false;
  if ((ndxDot2 - 3) <= ndxAt) return false;
  return true;
*/
  if (email == '') return true;
  return emailCheck(email)
}


<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- V1.1.3: Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
<!-- Original:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
<!-- Changes:
/* 1.1.4: Fixed a bug where upper ASCII characters (i.e. accented letters
international characters) were allowed.

1.1.3: Added the restriction to only accept addresses ending in two
letters (interpreted to be a country code) or one of the known
TLDs (com, net, org, edu, int, mil, gov, arpa), including the
new ones (biz, aero, name, coop, info, pro, museum).  One can
easily update the list (if ICANN adds even more TLDs in the
future) by updating the knownDomsPat variable near the
top of the function.  Also, I added a variable at the top
of the function that determines whether or not TLDs should be
checked at all.  This is good if you are using this function
internally (i.e. intranet site) where hostnames don't have to 
conform to W3C standards and thus internal organization e-mail
addresses don't have to either.
Changed some of the logic so that the function will work properly
with Netscape 6.

1.1.2: Fixed a bug where trailing . in e-mail address was passing
(the bug is actually in the weak regexp engine of the browser; I
simplified the regexps to make it work).

1.1.1: Removed restriction that countries must be preceded by a domain,
so abc@host.uk is now legal.  However, there's still the 
restriction that an address must end in a two or three letter
word.

1.1: Rewrote most of the function to conform more closely to RFC 822.

1.0: Original  */
// -->

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;
}