// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
// Author : Benton Valenzuela
//
// Simple routines to quickly pick up obvious typos.
// All validation routines return true if executed by an older browser:
// in this case validation must be left to the server.
//
// Update Jun 2005: discovered that reason IE wasn't setting focus was
// due to an IE timing bug. Added 0.1 sec delay to fix.
//
// Update Oct 2005: minor tidy-up: unused parameter removed
//
// Update Jun 2006: minor improvements to variable names and layout
//   Update July 2008 modified with additions by Benton Valenzuela
//  Modifications include adding functions for name, ID and Status selection.
// ----------------------------------------------------------------------

var nbsp = 160;		// non-breaking space char
var node_text = 3;	// DOM text node-type
var emptyString = /^\s*$/ ;
var global_valfield;	// retain valfield for timer thread

// --------------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// --------------------------------------------

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}


// --------------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// --------------------------------------------

function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  // save valfield in global variable so value retained when routine exits
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}


// --------------------------------------------
//                  msg
// Display warn/error message in HTML element.
// commonCheck routine must have previously been called
// --------------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
}

// --------------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// --------------------------------------------

var proceed = 3;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
 
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(infofield);
  
 // if (!elem.firstChild) return true;  // not available on this browser 
  //if (elem.firstChild.nodeType != node_text) return true;  // infofield is wrong type of node  

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "error", "ERROR: required");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// --------------------------------------------
//            validateName
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validateName(valfield,   // element to be validated
                         infofield ) // id of element to receive info/error msg
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//            validateTitle
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validateTitle(valfield, //element to be validated 
					   infofield)  // id of element to recieve info/error msg
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

// --------------------------------------------
//            validateID
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------
	   // var idNum = /^48[0-9]{7}|^01[0-9]{7}/;
	   
function validateID(valfield, //element to ve validated
					infofield)  // id of element to recieve info/error msg
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	var tfld = trim(valfield.value);
  	var idNum = /^48[0-9]{7}|^01[0-9]{7}/; //regular expression for checking valid ID numbers. Faculty/ staff first then students
 
	var numdigits = 0;
	
	for(var j = 0; j<tfld.length; j++)
	if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++; 
		if(numdigits<9 || numdigits>9)
			{
				
			 	msg (infofield, "error", "ERROR: ID must be 9 digits");
    			setfocus(valfield);
    			return false;
				
				
			}
			 if (!idNum.test(tfld)) 
				 {
    				msg (infofield, "error", "ID is not valid.");
    				setfocus(valfield);
    				return false;
  				 }
				  else
  {
  msg(infofield, "warn", "");
  return true;
  }
}

/*
function validateID(valfield, //element to ve validated
					infofield)  // id of element to recieve info/error msg
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
	
}
*/
// --------------------------------------------
//            validateAuthor
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

/*
function validateID(valfield, //element to ve validated. My romantic function.
					infofield)  // id of element to recieve info/error msg
{
	
	
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	 var tfld = trim(valfield.value);
  	 
	 //regular expression for ID
	// var idNum = /^[0-9]+$/;
    //  var idNum = /^4[8][0-9]{7}/;
	    var idNum = /^48[0-9]{7}|^01[0-9]{7}/; //regular expression for checking valid ID numbers. Faculty/ staff first then students
	  if (!idNum.test(tfld)) {
    msg (infofield, "error", "ID must be 9 digits with no spaces");
    setfocus(valfield);
    return false;
  }
  
    var numdigits = 0; 
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++; 
	
	if(numdigits == 9)
	{
		msg(infofield, "warn", "");
		return true;
	}
	
	 else if (numdigits<9) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short. Id must be 9 digits");
//	msg (infofield,"error","ERROR: " + numdigits + " digits - too short. Id must be 9 digits");
    setfocus(valfield);
    return false;
  }
	
}
*/


/*
function validateAuthor(valfield, //element to be validated
						infofield) //id of element to be validated
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;  //checks for empty field
	
	
	
	msg(infofield, "warn", "");
	return true;
}
*/

// --------------------------------------------
//            validateStatus
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validateStatus(valfield, 		//element to be validated
						 infofield)		//id of element to be validated
{
    
	var stat = commonCheck(valfield, infofield, true);
	
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;

}

// --------------------------------------------
//            validateStatus
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validatePublisher(valfield,	//element to be validated
						   	infofield)	//id of element to be validated
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
	
}


function validateEmail(valfield, 	//element to be validated
					   	infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

function validateEdition(valfield,
						 infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat; 
	
	msg(infofield, "warn", "");
	return true;
	
}

function validatePhone(valfield,
						 infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat; 
	
	msg(infofield, "warn", "");
	return true;
	
}

function validateItem(valfield,
						 infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat; 
	
	msg(infofield, "warn", "");
	return true;
	
}


/*

proceed2 = 2;
function commonCheck2   (vfld,   // element to be validated
                         ifld)   // id of element to receive info/error msg
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem.firstChild)
    return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text)
    return true;  // ifld is wrong type of node  

  msg (ifld, "warn", "");  // clear any previous error message
  return proceed2;
}

function validateCheck(vfld,
					   ifld)
{
	var stat = commonCheck2(vfld, ifld, true);
	if(stat != proceed) return stat;
	
	if (vfld.checked) return true;  //If user has checked the box

	var errorMsg = 'Error: Required';

    msg (ifld, "error", errorMsg);
  	return false;

	
	//msg(infofield, "warn", "");
	//return true;
}
*/





function validateISBN(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}
/*

function validateRush(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}
*/
function validateReference(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

function validateVol(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

function validateIssue(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

function validatePages(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

function validateISSN(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}

function validateDate(valfield,
					   infofield)
{
	var stat = commonCheck(valfield, infofield, true);
	if(stat != proceed) return stat;
	
	msg(infofield, "warn", "");
	return true;
}