// ----------------------------------------------------------------------
// 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.
//  
// Modified by Mikhail Koryak: 
// added arguments to functions of messages to inject into innerHTML
// of error, and warn, where applicable
// error is the error message to display if the validation fails
// warn is the warning message to display if the validation does not fail
// but something "may" be wrong with the input, for example, email validation
// will display warn if user enters email of a@a.com 
// 
// use these new params to inject translated messages into innerHTML
// 
// ----------------------------------------------------------------------

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; //uncomment these 2 lines and comment the line global_valfield.focus();
 // setTimeout( 'setFocusDelayed()', 100 );
 
 valfield.focus();
}


// --------------------------------------------
//                  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 = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required,   // true if required
                         errmsg) // message to display on error
{
  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  
  //alert(valfield.value);
  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "error", errmsg);  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

function commonCheckSelected   (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required,   // true if required
                         errmsg) // message to display on error
{
  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  
  //alert("commonCheckSelected "+valfield.value);
  if (valfield.value==0) {
    if (required) {
      msg (infofield, "error", errmsg);  
      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,   // element to be validated
                         infofield, // id of element to receive info/error msg
                         errmsg) // message to display on error

{
  //alert("validatePresent "+valfield.value);
  var stat = commonCheck (valfield, infofield, true, errmsg);
  if (stat != proceed) return stat;

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

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

function validateSelected(valfield,   // element to be validated
                         infofield, // id of element to receive info/error msg
                         errmsg) // message to display on error

{
  //alert("validateSelected "+valfield.value);
  var stat = commonCheckSelected (valfield, infofield, true, errmsg);
  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)
// --------------------------------------------

function validateEmail  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required, // true if required
                         errmsg)  //message to display on error
{
  var stat = commonCheck (valfield, infofield, required, errmsg);
  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", errmsg);
    setfocus(valfield);
    return false;
  }
  //remove the second check, since it checks if the email has for of a@a.com which is
  //probably fake, but we allow users with such emails because we are nice. 
  return true;
}

//Udo
function validateDate  (valfield,   // element to be validated
                        dateFormat, 
                         infofield,  // id of element to receive info/error msg
                         required, // true if required
                         errmsg, // message to display on error
                         warnmsg)  //message to display on warn
{
  //alert("dateFormat: "+dateFormat)
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var a = tfld.split("/");
  
  if(a.length!=3) return false;
  else{
    var year;
    var month;
    var day;
    //Japan
    if(dateFormat=="YYYY/MM/DD"){
      year=a[0];
      month=a[1]-1;
      day=a[2];
    } else if(dateFormat=="MM/DD/YYYY"){ 
          year=a[2];
          month=a[0]-1;
          day=a[1];
    } else{ //DD/MM/YYYY
      year=a[2];
      month=a[1]-1;
      day=a[0];
    }
    //alert(year+"|"+month+"|"+day);
    current = new Date(year,month,day);
    //alert(current.getFullYear()+"|"+current.getMonth()+"|"+current.getDate());
    
    if(year!=current.getFullYear()) return false;
    if((month)!=current.getMonth()) return false;
    if(day!=current.getDate()) return false;
    
    
  }
  
  return true;
}
// --------------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// --------------------------------------------

function validateTelnr  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required,   // true if required
                         errmsg, // message to display on error
                         warnmsg)  //message to display on warn
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    msg (infofield, "error", errmsg);
    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<6) {
    msg (infofield, "error", errmsg);
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", warnmsg);
  else { 
    if (numdigits<10)
      msg (infofield, "warn", warnmsg);
    else
      msg (infofield, "warn", "");
  }
  return true;
}

// --------------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// --------------------------------------------

function validateAge    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required,   // true if required
                         errmsg, // message to display on error
                         warnmsg)  //message to display on warn
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (infofield, "error", errmsg);
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "error", errmsg);
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", warnmsg);
  else {
    if (tfld<7) msg (infofield, "warn", warnmsg);
    else        msg (infofield, "warn", "");
  }
  return true;
}