// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
//
// 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.
//
// ----------------------------------------------------------------------

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.style.color ="red" ;
//  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 = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{

//  alert('common check ' + infofield);

  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", "Erreur: champ obligatoire");  
      setfocus(valfield);

      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }

  return proceed;
}

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

function validatePresent(valfield,   
                         infofield ) 
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

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

// --------------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

/////////////
// Email
//////////////

function validateEmail  (valfield,   
                         infofield,  
                         required)   
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    msg (infofield, "error", "Adresse email invalide");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "warn", "Adresse email inhabituelle - vérifier");
  else
    msg (infofield, "warn", ""); // clear error message
  return true;
}

////////////////
// URL
///////////////////

function validateUrl     (valfield,  
                         infofield,  
                         required)   
  {
    var stat = commonCheck (valfield, infofield, required);
    if (stat != proceed) return stat;
    
    var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
    var regexp = /(ftp|http|https|news|gopher):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
    if (regexp.test(tfld)) 
    				{
    				msg (infofield, "warn", ""); // clear
    				return true;
    				}
    
    msg (infofield, "error", "Adresse invalide");
    setfocus(valfield);
    return false;

  } // validateUrl
  
//////////////
// Notice
/////////////////

  function validateNotice  (valfield,   
                           infofield,  
                           required)   
    {
     var stat = commonCheck (valfield, infofield, required);
     if (stat != proceed) return stat;

    var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
    if(tfld.indexOf('href') >= 0)
    	{
    	msg (infofield, "error", "Erreur : Texte invalide (html)");
	setfocus(valfield);
	return false;
    	}
    msg (infofield, "warn", ""); 
    return true;
    }

/////////////////
// Rub or Srub
////////////////////

  function validateSsrub  (valfield,   
                           infofield,  
                           required)   
    {
     var stat = commonCheck (valfield, infofield, required);
     if (stat != proceed) return stat;
     if(valfield.value == 'nul')
    	{
    	msg (infofield, "error", "Sélection obligatoire");
	setfocus(valfield);
	return false;
    	}
    msg (infofield, "warn", ""); 
    return true;
    }