// ----------------------------------------------------------------------
// 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

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

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


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

function msg(msgtype, // class to give element ("red" or "red")
             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 = message;
    
  } else {
  	dispmessage = "";
  }
  totalMessage = totalMessage+dispmessage;
  
}


//------------------Show Span-------------------

function showStuff(id) {
	document.getElementById(id).style.display = 'block';
}

// --------------------------------------------
//            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
                         required,   // true if required
                         txtField )
{
	
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
    

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg ("red", txtField);
      showStuff('inf_Details');
//      document.getElementById('error_anchor').focus();
    window.location.hash="error_anchor"; 
      return false;
    }
    else {
      return true;  
    }
  }
  return proceed;
}

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

function validatePresent(valfield,   // element to be validated
                         txtField )
{
  var stat = commonCheck (valfield, true, txtField);
  if (stat != proceed) return stat;

  msg ("red", "");  
  return true;
}


/* RNS/SH 4 Sep 08 - checkbox & radio validation */

function validateBoxs ( objname, txtField ) {                  
	var counted = 0;
	var f = document.naform;
	var object;
	var firstobject = null;
	var objlist = objname.split(',')

	for ( var i = 0; i < f.elements.length; i++ ) {
		object = f.elements[i];
		if ( object.type == 'checkbox' ) {                                               //validate Checkboxs
			for ( var j = 0; j < objlist.length; j++ ) {
				if  ( object.name == objlist[j] ) {
					if ( firstobject == null )
					firstobject = object;
					if ( object.checked == true )
					counted++;
				}
			}
		}
		if ( object.type == 'radio' ) {													//validate Radio buttons
			for ( var j = 0; j < objlist.length; j++ ) {
				if  ( object.name == objlist[j] ) {
					if ( firstobject == null )
					firstobject = object;
					if ( object.checked == true )
					counted++;
				}
			}
		}
	}

	if ( counted < 1 ) {
		msg ("red", txtField);
		showStuff('inf_Details');
		window.location.hash="error_anchor"; 
		
		return false;
	} else {

		/* Remove error from info div .... */
		
		msg ("red", "");
		
		return true;
	}
}


/*
 * Silent version of validatebox to handle certain validation types on multi grid questions etc
 */

 function validateBoxsSilent ( objname ) {                  
		var counted = 0;
		var f = document.naform;
		var object;
		var firstobject = null;
		var objlist = objname.split(',')
		
		for ( var i = 0; i < f.elements.length; i++ ) {
			object = f.elements[i];
			if ( object.type == 'checkbox' ) {                                               //validate Checkboxs
				for ( var j = 0; j < objlist.length; j++ ) {
					if  ( object.name == objlist[j] ) {
						if ( firstobject == null )
						firstobject = object;
						if ( object.checked == true )
						counted++;
					}
				}
			}
			if ( object.type == 'radio' ) {													//validate Radio buttons
				for ( var j = 0; j < objlist.length; j++ ) {
					if  ( object.name == objlist[j] ) {
						if ( firstobject == null )
						firstobject = object;
						if ( object.checked == true )
						counted++;
					}
				}
			}
		}
		
		if ( counted < 1 ) {
			return false;
		} else {
			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, "red", "ERROR: not a valid e-mail address");
    showStuff('inf_Details');
//    document.getElementById('error_anchor').focus();
    window.location.hash="error_anchor"; 
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "red", "Unusual e-mail address - check if correct");
  else
    msg (infofield, "red", "");
  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, "red", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    showStuff('inf_Details');
//    document.getElementById('error_anchor').focus();
    window.location.hash="error_anchor"; 
    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, "red", "ERROR: " + numdigits + " digits - too short");
    showStuff('inf_Details');
//    document.getElementById('error_anchor').focus();
    window.location.hash="error_anchor"; 
    return false;
  }

  if (numdigits>14)
    msg (infofield, "red", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (infofield, "red", "Only " + numdigits + " digits - check if correct");
    else
      msg (infofield, "red", "");
  }
  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, "red", "ERROR: not a valid age");
    showStuff('inf_Details');
//    document.getElementById('error_anchor').focus();
    window.location.hash="error_anchor"; 
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "red", "ERROR: not a valid age");
    showStuff('inf_Details');
//    document.getElementById('error_anchor').focus();
    window.location.hash="error_anchor"; 
    return false;
  }

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

function uncheckRadio(str_radio_name) {

	var choice = document.getElementsByName(str_radio_name);

	for (i = 0; i < choice.length; i++) {

		if ( choice[i].checked = true ) 
		choice[i].checked = false; 
		
	}
	
}