// JavaScript Document
// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
// Modified by: Piero Filippin
// 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 Aug 2004: have tested that IE 5.0 and IE 5.5 both support DOM model
// sufficiently well, so innerHTML option removed (redundant).
// ----------------------------------------------------------------------

var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
emptyString = /^\s*$/

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

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;
};

// -----------------------------------------
//            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    (vfld,   // element to be validated
	ifld,   // id of element to receive info/error msg
	reqd)   // true if required
	{
	if (!document.getElementById) 
		return true;  // not available on this browser - leave validation to the server
	var elem = document.getElementById(ifld);
	if (!elem.firstChild)
		return true;  // not available on this browser 
	if (elem.firstChild.nodeType != node_text)
		return true;  // ifld is wrong type of node  

	if (emptyString.test(vfld.value)) {
		if (reqd) {
			msg (ifld, "error", "ERROR: required");  
			vfld.focus();
			return false;
		}
		else {
			msg (ifld, "warn", "");   // OK
			return true;  
		}
	}
	return proceed;
}
function validatePassword(	vfld1,   // first element to be validated
						  	vfld2,   // second element to be validated
							ifld )  // id of element to receive info/error msg
	{
	if (vfld1.value!=vfld2.value){
		vfld1.focus();
		vfld1.value="";
		vfld2.value="";
		msg(ifld,"error","Password mismatch");
		return false;
	}
	return true;
};

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

function validatePresent(vfld,   // element to be validated
	ifld )  // id of element to receive info/error msg
	{
	var stat = commonCheck (vfld, ifld, true);
	if (stat != proceed) 
		return stat;
	msg (ifld, "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  (vfld,   // element to be validated
	ifld,   // id of element to receive info/error msg
	reqd)   // true if required
{
	var stat = commonCheck (vfld, ifld, reqd);
	if (stat != proceed) return stat;

	var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
	var email = /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*([,]\s*\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*)*$/
	if (!email.test(tfld)) {
		msg (ifld, "error", "ERROR: not a valid e-mail address");
		vfld.focus();
		return false;
	}

	var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/
	if (!email2.test(tfld)) 
		msg (ifld, "warn", "Unusual e-mail address - check if correct");
	else
		msg (ifld, "warn", "");
	return true;
};


// -----------------------------------------
//             validateNumber
// Validate numbers
// Returns true if OK 
// -----------------------------------------

function validateNumber  (vfld,   // element to be validated
	ifld,   // id of element to receive info/error msg
	reqd)   // true if required
{
	var stat = commonCheck (vfld, ifld, reqd);
	if (stat != proceed) return stat;

	var tfld = trim(vfld.value);
	var numberRE = /^[0-9]{1,3}$/
	if (!numberRE.test(tfld)) {
		msg (ifld, "error", "ERROR: not a valid number");
		vfld.focus();
		return false;
	}
	return true;
};
function validateLogin  (vfld,   // element to be validated
	ifld,   // id of element to receive info/error msg
	reqd)   // true if required
{
	var stat = commonCheck (vfld, ifld, reqd);
	if (stat != proceed) return stat;

	var tfld = trim(vfld.value);
	var loginRE = /^[a-zA-Z0-9_.]+$/
	if (!loginRE.test(tfld)) {
		msg (ifld, "error", "ERROR: only letter, numbers, dots and underscores allowed");
		vfld.focus();
		return false;
	}
	msg (ifld, "warn", "");
	return true;
};
function validateSize8  (vfld,   // element to be validated
	ifld)   // id of element to receive info/error msg
{
	var stat = commonCheck (vfld, ifld, true);
	if (stat != proceed) return stat;

	var tfld = trim(vfld.value);
	var loginRE = /^.{8,20}$/
	if (!loginRE.test(tfld)) {
		msg (ifld, "error", "ERROR: too short, should be at least 8 chars long");
		vfld.focus();
		return false;
	}
	msg (ifld, "warn", "");
	return true;
};