// validate.js

function formcancel()
  {
     var yes_or_no=confirm ("Are you sure you want to cancel the Questionnaire?\nYour answers will not be saved.");
     if (yes_or_no== true)  self.close();
  }
//
// return "ok" or "no answer"
function validateCheckBox( qNumber){
var valid;
var field;
var returnCode="no answer";
  for(var i=0; i<document.regForm.length; i++){
    field=document.regForm[i];
    if(field.name.substr(0, qNumber.length) == qNumber) {
       if (field.checked== true){
          //alert(field.name + "  is checked");
           returnCode="ok";
           }
      }
    } // end of for loop
  return (returnCode);
}

//-----------------------------------------
// validateEntry
//-----------------------------------------
function numberOnly(field, theAllowed){
//alert(xyz.value);
// var theField =eval("document.regForm." + field + ".value");
 var theField=field.value;
 var i=0;
 i=theAllowed.indexOf(theField);
 if (i==-1){
    field.value="";
    }
}
//-----------------------------------------
// return "no entry" or "too many" or "ok"
//-----------------------------------------
function validateRank(qNumber){
var valid="no entry";
var field;
  //alert(field.name.substr(0,qNumber.length));
  for(var i=0;i<document.regForm.length;i++){
    field=document["regForm"][i];
    if(field.value=="1" && field.name.substr(0,qNumber.length)==qNumber)
       valid=(valid=="no entry")?"ok":"too many";
  }
  return valid;
}
// -->

//-----------------------------------------
// return "no selection" or "ok"
//-----------------------------------------
function validateSelectBox(qNumber){
	var valid="no selection";
 	var list = document.forms[0].elements[qNumber];
 	if (list.selectedIndex != 0) {
 		valid = "ok";
		}
  	return valid;
	}

//---------------------------------------------
// return "ok", or error message
//---------------------------------------------

//--------------------------
function emailCheck (emailStr) {
   if (emailStr=="")
     return("ok");

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

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    return("The username doesn't seem to be valid.");
    
}

/* 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 "ok";
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("The domain name doesn't seem to be valid.")
    return false
}

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

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
    return "The address must end in a three-letter domain, or two letter country.";
  
}

// Make sure there's a host name preceding the domain.
if (len<2) {
    return "This address is missing a hostname!"
}

// If we've gotten this far, everything's valid!
return "ok";
}
//  End -->