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


// --------------------------------------------
//                  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(field, msgtype, message) {
	document.getElementById(field).innerHTML = 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, infofield, required) {
	var elem = document.getElementById(infofield);
	
	if (emptyString.test(valfield.value)) {
    	if (required) {
			msg(infofield, "error", "ERROR: required");  
			setfocus(valfield);
			proceed = false;
		} else {
			msg (infofield, "warn", "");   // OK
			proceed = 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)
// --------------------------------------------

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", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		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", "<img src='"+root+"/images/icons/ico-error.gif' />");
	} else {
		msg(infofield, "warn", "<img src='"+root+"/images/icons/ico-ok.gif' class='error-img' />");
	}
	
	return true;
}



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

function validateString(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 str = /[A-Za-z]/  ;
	if (!str.test(tfld)) {
		msg(infofield, "error", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		setfocus(valfield);
		return false;
	} else {
		msg(infofield, "error", "<img src='"+root+"/images/icons/ico-ok.gif' class='error-img' />");
	}
	
	return true;
}


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

function validateStringNumber(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 str = /[A-Za-z0-9]/  ;
	if (!str.test(tfld)) {
		msg(infofield, "error", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		setfocus(valfield);
		return false;
	} else {
		msg(infofield, "error", "<img src='"+root+"/images/icons/ico-ok.gif' class='error-img' />");
	}
	
	return true;
}


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

function validateNumber(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 nmbr = /[0-9]/  ;
	if (!nmbr.test(tfld)) {
		msg(infofield, "error", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		setfocus(valfield);
		return false;
	} else {
		msg(infofield, "error", "<img src='"+root+"/images/icons/ico-ok.gif' class='error-img' />");
	}
	
	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, 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 telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
	
	if (!telnr.test(tfld)) {
		msg (infofield, "error", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		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", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		setfocus(valfield);
		return false;
		}
	
		if (numdigits>14) {
			msg (infofield, "warn", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
		} else { 
			if (numdigits<10) {
				msg (infofield, "warn", "<img src='"+root+"/images/icons/ico-error.gif' class='error-img' />");
			} else {
				msg (infofield, "warn", "");
			}
		}
	}
	
	return true;
}