// ----------------------------------------------------------------------
// 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.
//
// 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
// ----------------------------------------------------------------------

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

function validateOnSubmit_nieuwsbriefaanmelden() {
    var elem;
    var errs=0;
	// execute all element validations in reverse order, so focus gets
    // set to the first one in error.
   // if (!validateTelnr  (document.forms.contact_form.telnr, 'inf_telnr', true)) errs += 1; 
   // if (!validateAge    (document.forms.contact_form.age,   'inf_age',  false)) errs += 1; 
 
    if (!validateEmail  (document.forms.aanmeldennieuwsbrief_form.form_email, 'inf_email', true)) errs += 1; 
    if (!validatePresent(document.forms.aanmeldennieuwsbrief_form.form_voorletters,  'inf_voorletters'))        errs += 1;  
    if (!validatePresent(document.forms.aanmeldennieuwsbrief_form.form_achternaam,  'inf_achternaam'))        errs += 1; 


   // if (errs>1)  alert('There are fields which need correction before sending');
   // if (errs==1) alert('There is a field which needs correction before sending');

    return (errs==0);
  };
 
 function validateOnSubmit_shopdetails() {
    var elem;
    var errs=0;
	// execute all element validations in reverse order, so focus gets
    // set to the first one in error.
   // if (!validateTelnr  (document.forms.contact_form.telnr, 'inf_telnr', true)) errs += 1; 
   // if (!validateAge    (document.forms.contact_form.age,   'inf_age',  false)) errs += 1; 

    if (!validatePresent(document.forms.bestelgegevens_form.aflever_land,  'inf_aflever_land'))        errs += 1;  
    if (!validatePresent(document.forms.bestelgegevens_form.aflever_woonplaats,  'inf_aflever_woonplaats'))        errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.aflever_postcode,  'inf_aflever_postcode'))        errs += 1;  
    if (!validatePresent(document.forms.bestelgegevens_form.aflever_adres,  'inf_aflever_adres'))        errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.aflever_voorletter,  'inf_aflever_voorletter'))        errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.aflever_naam,  'inf_aflever_naam'))        errs += 1; 
	
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_telefoon,  'inf_telefoon'))        errs += 1;  
    if (!validateEmail  (document.forms.bestelgegevens_form.factuur_email, 'inf_email', true)) errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_land,  'inf_land'))        errs += 1;  
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_woonplaats,  'inf_woonplaats'))        errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_postcode,  'inf_postcode'))        errs += 1;  
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_adres,  'inf_adres'))        errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_voorletter,  'inf_voorletter'))        errs += 1; 
    if (!validatePresent(document.forms.bestelgegevens_form.factuur_naam,  'inf_naam'))        errs += 1; 
	
	
   // if (errs>1)  alert('There are fields which need correction before sending');
   // if (errs==1) alert('There is a field which needs correction before sending');
    return (errs==0);
  };
  
  
function validateOnSubmit() {
    var elem;
    var errs=0;

	// execute all element validations in reverse order, so focus gets
    // set to the first one in error.
   // if (!validateTelnr  (document.forms.contact_form.telnr, 'inf_telnr', true)) errs += 1; 
   // if (!validateAge    (document.forms.contact_form.age,   'inf_age',  false)) errs += 1; 
 
    if (!validateEmail  (document.forms.contact_form.form_email, 'inf_email', true)) errs += 1; 
    if (!validatePresent(document.forms.contact_form.form_naam,  'inf_from'))        errs += 1;  
    if (!validatePresent(document.forms.contact_form.form_bericht,  'inf_message'))        errs += 1; 


   // if (errs>1)  alert('There are fields which need correction before sending');
   // if (errs==1) alert('There is a field which needs correction before sending');

    return (errs==0);
  };
  
  
// --------------------------------------------
//                  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 = 2;  

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 = MM_findObj(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", "*");  // text was ERROR: REQUIRED
	  if (valfield.className =="textarea" || valfield.className =="textarea-error") { 
	  	valfield.className = "textarea-error"; 
	  } 
	  else { 
	  	valfield.className = "textfield-error"; 
	  }
      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
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;
  	  
	  if (valfield.className =="textarea" || valfield.className =="textarea-error") { 
	  	valfield.className = "textarea"; 
	  } 
	  else { 
	  	valfield.className = "textfield"; 
	  }
	  
  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
{
  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", "*"); // text was ERROR: not a valid e-mail address
	valfield.className = "textfield-error";	
    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", "* >>"); // Unusual e-mail address - check if correct
  else
    msg (infofield, "warn", "*");
	valfield.className = "textfield";	
  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
{
  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", "*"); // ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +
    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", "*"); //ERROR: " + numdigits + " digits - too short
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "*"); // Only " + numdigits + " digits - check if correct
    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
{
  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", "*"); // ERROR: not a valid age
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "error", "*"); // ERROR: not a valid age
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", "*"); // Older than 110: check correct
  else {
    if (tfld<7) msg (infofield, "warn", "*"); //Bit young for this, aren't you?
    else        msg (infofield, "warn", "*");
  }
  return true;
}