// ----------------------------------------------------------------------
// 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');
			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;
	}
}

// --------------------------------------------
//               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;
}