// -------------------------------------------------------------
// Copyright (c) 2006 Codejock Software, All Rights Reserved.
// url: http://www.codejock.com
// -------------------------------------------------------------

// toggleCode - toggles display block of code
function toggleCode(display1, hide1, hide2) 
{
	if (document.layers) 
	{
		document.layers[display1].display = 'block';
		document.layers['opt' + display1].style.fontWeight = 'bold';
		document.layers[hide1].display = 'none';
		document.layers['opt' + hide1].style.fontWeight = 'normal'; 
		if (document.all[hide2]) 
		{
			document.layers[hide2].display = 'none';
			document.layers['opt' + hide2].style.fontWeight = 'normal'; 
		}
	}
	else if (document.all) 
	{
		document.all[display1].style.display = 'block';
		document.all['opt' + display1].style.fontWeight = 'bold';
		document.all[hide1].style.display = 'none';
		document.all['opt' + hide1].style.fontWeight = 'normal'; 
		if (document.all[hide2]) 
		{
			document.all[hide2].style.display = 'none';    
			document.all['opt' + hide2].style.fontWeight = 'normal'; 
		}
	}
	else if (document.getElementById) 
	{
		document.getElementById(display1).style.display = 'block';
		document.getElementById('opt' + display1).style.fontWeight = 'bold';
		document.getElementById(hide1).style.display = 'none';
		document.getElementById('opt' + hide1).style.fontWeight = 'normal';   
		if (document.getElementById(hide2)) 
		{ 
			document.getElementById(hide2).style.display = 'none';
			document.getElementById('opt' + hide2).style.fontWeight = 'normal';    
		}
	}
}

function Truncate(form)
{
	if (form.value.length > 65535) 
	{
		form.value = (form.value.substr(0,65535));
	}
}

// ----------------------------------------------------------------------
// 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 Aug 2004: have tested that IE 5.0 and IE 5.5 both support DOM model
// sufficiently well, so innerHTML option removed (redundant).
//
// 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
// ----------------------------------------------------------------------

var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
var emptyString = /^\s*$/
var glb_vfld;      // retain vfld 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()
{
	glb_vfld.focus()
}
  
function setfocus(vfld)
{
	// save vfld in global variable so value retained when routine exits
	glb_vfld = vfld;
	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	(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");  
			setfocus(vfld);
			return false;
		}
		else 
		{
			msg (ifld, "warn", "");   // OK
			return true;  
		}
	}
	return proceed;
}
  
// -----------------------------------------
//            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;
}
  
// -----------------------------------------
//            validatePresentField
// Validate if something has been entered
// Returns true if so 
// -----------------------------------------
  
function validatePresentField(vfld, ifld, sfld, bSelect)
{
	var stat = commonCheck (vfld, ifld, true);
	if (stat != proceed)
	{
		if (bSelect)
			msg (ifld, "error", "Please select a '" + sfld + "'.");
		else
			msg (ifld, "error", "'" + sfld + "' cannot be left blank.");
		return stat;
	}
	
	msg (ifld, "warn", "");  
	return true;
}
  
// -----------------------------------------
//            validatePasswords
// Validate if password fields match.
// -----------------------------------------
  
function validatePasswords(	vfld1,	// element to be validated
						 	vfld2,	// element to be validated
						 	ifld)	// id of element to receive info/error msg
{
	if (vfld1.value != vfld2.value)
	{
		msg (ifld, "error", "Passwords do not match");  
		setfocus(vfld2);
		return false;
	}
	
	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) 
	{
		msg (ifld, "error", "Email can't be left blank");  
		return stat;
	}
	
	var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
	var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/
	if (!email.test(tfld)) 
	{
		msg (ifld, "error", "Not a valid e-mail address");
		setfocus(vfld);
		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;
}
  
  
// -----------------------------------------
//            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(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 telnr = /^\+?[0-9 ()-]+[0-9]$/
	if (!telnr.test(tfld)) 
	{
		msg (ifld, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
		setfocus(vfld);
		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 (ifld, "error", "ERROR: " + numdigits + " digits - too short");
		setfocus(vfld);
		return false;
	}
	
	if (numdigits > 14)
	  	msg (ifld, "warn", numdigits + " digits - check if correct");
	else 
	{ 
		if (numdigits < 10)
			msg (ifld, "warn", "Only " + numdigits + " digits - check if correct");
		else
			msg (ifld, "warn", "");
	}
	return true;
}
  
// -----------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// -----------------------------------------
  
function validateAge  (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 ageRE = /^[0-9]{1,3}$/
	if (!ageRE.test(tfld)) 
	{
	  	msg (ifld, "error", "ERROR: not a valid age");
	  	setfocus(vfld);
	  	return false;
	}
	
	if (tfld >= 200) 
	{
	  	msg (ifld, "error", "ERROR: not a valid age");
	  	setfocus(vfld);
	  	return false;
	}
	
	if (tfld > 110) msg (ifld, "warn", "Older than 110: check correct");
	else 
	{
	  	if (tfld < 7) msg (ifld, "warn", "Bit young for this, aren't you?");
	  	else        msg (ifld, "warn", "");
	}
	return true;
}

function validateOnSubmit() 
{
	var errs=0;
	
	// execute all element validations in reverse order, so focus gets
	// set to the first one in error.
	
	if (!validatePresent(document.forms.submit.Description, 'reqDescription')) errs += 1; 
	if (!validateEmail  (document.forms.submit.Email,       'reqEmail', true)) errs += 1;
	if (!validatePresent(document.forms.submit.Name,        'reqName'))        errs += 1; 
	
	if (errs>1) 
	{
	  	alert('There are fields which need correction before sending');
	  	return false;
	}
	
	if (errs==1) 
	{
	  	alert('There is a field which needs correction before sending');
	  	return false;
	}

	return true;
}