// validate.js 1.991
// a generic form validator 
// by Brian Lalonde http://webcoder.info/downloads/
// Slightly modified by the one and only Ben Balzarini :-)
// This work is licensed under the Creative Commons Attribution-Share Alike 3.0 License. 
// To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/ 
// or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.

function formFocus(frm)
{ // convenient way to start the form onLoad
	if(!document.forms.length) return;
	var els= ( frm || document.forms[0] ).elements;
	for(var i= 0; i < els.length; i++)
		if(els[i].type != 'hidden') { try { els[i].focus(); return; } catch(e){} }
}

function formChanged(frm)
{ // determine whether any form fields have changed
	if(!document.forms.length) return;
	var els= ( frm || document.forms[0] ).elements;
	for(var i= 0; i < els.length; i++)
		switch(els[i].type)
		{
			case 'text': 
			case 'textarea': 
			case 'password': 
			case 'hidden':
			case 'file':
				if(els[i].defaultValue!=els[i].value)
				{ status= 'The '+fieldname(els[i])+' field has changed.'; return true; } 
				break;
			case 'checkbox':
				if(els[i].defaultChecked!=els[i].checked)
				{ status= 'The '+fieldname(els[i])+' checkbox has changed.'; return true; }
				break;
			case 'select-one':
				for(var j= 1; j < els[i].options.length; j++)
					if(els[i].options[j].defaultSelected!=els[i].options[j].selected)
					{ status= 'The '+fieldname(els[i])+' selection has changed.'; return true; }
				break;
			case 'select-multiple':
				for(var j= 0; j < els[i].options.length; j++)
					if(els[i].options[j].defaultSelected!=els[i].options[j].selected)
					{ status= 'The '+fieldname(els[i])+' selections have changed.'; return true; }
				break;
			case 'radio':
				if(els[i].length)
					for(var j= 0; j < els[i].length; j++)
						if(els[i][j].defaultChecked!=els[i][j].checked)
						{ status= 'The '+fieldname(els[i])+' choice has changed.'; return true; }
				break;
		}
	return false;
}

function fieldname(fld)
{ // get the field label text or name
	if(fld.id && document.getElementsByTagName)
	{
		for(var i= 0, lbl= document.getElementsByTagName('LABEL'); i < lbl.length; i++)
			if(lbl[i].htmlFor==fld.id) return lbl[i].nodeValue||lbl[i].textContent||lbl[i].innerText;
		for(var i= 0, lbl= document.getElementsByTagName('label'); i < lbl.length; i++)
			if(lbl[i].htmlFor==fld.id) return lbl[i].nodeValue||lbl[i].textContent||lbl[i].innerText;
	}
	return fld.name||fld.type;
}

function requireValue(fld)
{ // disallow a blank field
	if(fld.disabled) return true;
	if(!(fld.offsetWidth == undefined || fld.offsetWidth > 0)) return true;
	if(!fld.value.length)
	{ status= 'The '+fieldname(fld)+' field cannot be left blank.'; return false; }
	return true;
}

function requireChecked(fld)
{ // require a checkbox to be checked
	if(fld.disabled) return true;
	if(!fld.checked)
	{ status= 'The '+fieldname(fld)+' checkbox must be checked.'; return false; }
	return true;
}

function requireConfirmation(fld,confirmfld)
{ // require fields to match
	if(fld.disabled) return true;
	if(fld.value != confirmfld.value)
	{ status= 'The '+fieldname(fld)+' field does not match the '+fieldname(confirmfld)+' field.'; return false; }
	return true;
}

function requireRadio(radios)
{ // require at least one radio in this group to be checked
	if(!radios.length) return true; // invalid parameter
	var visible= false, enabled= false;
	for(var i= 0; i < radios.length; i++)
	{
		if(!enabled) enabled= !radios[i].disabled;
		if(radios[i].checked) return true;
		else if(typeof(radios[i].offsetWidth) == 'undefined' || radios[i].offsetWidth > 0) visible= true;
	}
	if(!visible||!enabled) return true; // no visible/enabled options in this group
	status= 'You must select one of the '+radios[0].name+' options.';
	return false;
}

function requireLength(fld,min,max)
{ // set minimum and/or maximum field lengths
	if(!fld.value.length||fld.disabled) return true; // blank fields are the domain of requireValue 
	var len= fld.value.length;
	if(min > -1 && len < min)
	{ status= 'The '+fieldname(fld)+' field must be at least '+min+
		' characters long; it is currently '+len+' characters long.'; return false; }
	if(max > -1 && len > max)
	{ status= 'The '+fieldname(fld)+' field must be no more than '+max+
		' characters long; it is currently '+len+' characters long.'; return false; }
	return true;
}

function dependants(enabled,elements)
{ // convenience function to enable/disable dependant fields, passed in as an array 
	if(!elements.length) return true;
	for(var i= 0; i < elements.length; i++)
		elements[i].disabled= !enabled;
}

function allowChars(fld,chars)
{ // provide a string of acceptable chars for a field
	if(fld.disabled) return true;
	for(var i= 0; i < fld.value.length; i++)
	{
		if(chars.indexOf(fld.value.charAt(i)) == -1)
			if(fld.value.charAt(i) == " ")
				{ status= 'The '+fieldname(fld)+' field may not contain spaces.'; return false; }
			else
				{ status= 'The '+fieldname(fld)+' field may not contain "'+fld.value.charAt(i)+'" characters.'; return false; }
	}
	return true;
}

function checkEmail(fld)
{ // simple email check
	if(!fld.value.length||fld.disabled) return true; // blank fields are the domain of requireValue 
	var phony= /@(\w+\.)*example\.(com|net|org)$/i;
	if(phony.test(fld.value))
	{ status= 'Please enter your email address in the '+fieldname(fld)+' field.'; return false; }
	var emailfmt= /^\w+([.-]\w+)*@\w+([.-]\w+)*\.\w{2,8}$/;
	if(!emailfmt.test(fld.value))
	{ status= 'The '+fieldname(fld)+' field must contain a valid email address.'; return false; }
	return true;
}

function fixFixed(fld,dec,sep)
{ // fixed decimal fields 
	if(!fld.value.length||fld.disabled) return true; // blank fields are the domain of requireValue 
	var val= fld.value;
	if(typeof(sep)!='undefined') val= val.replace(new RegExp(sep,'g'),'');
	val= parseFloat(fld.value);
	if(isNaN(val))
	{ // parse error 
		status= 'The '+fieldname(fld)+' field must contain a number.';
		return false;
	}
	var sign= ( val < 0 ? '-': '' );
	val= Number(Math.round(Math.abs(val)*Math.pow(10,dec))).toString();
	while(val.length < dec) val= '0'+val;
	var len= val.length;
	val= sign + ( len == dec ? '0' : val.substring(0,len-dec) ) + '.' + val.substring(len-dec,len+1);
	fld.value= val;
	return true;
}

function fixPhone(fld,defaultAreaCode,sep,noext)
{ // tenacious phone # correction 
	if(!fld.value.length||fld.disabled) return true; // blank fields are the domain of requireValue 
	if(typeof(sep)=='undefined') sep= '-';
	if(typeof(defaultAreaCode)!='undefined') defaultAreaCode= defaultAreaCode + sep;
	var ext= '', val= fld.value.toLowerCase();
	if(val.indexOf('x') > 0)
	{
		if(!noext) ext= ' x'+val.substr(val.indexOf('x')).replace(/\D/g,'');
		val= val.substr(0,val.indexOf('x'));
	}
	val= val.replace(/\D/g,'');
	if(val.length == 7)
	{
		fld.value= defaultAreaCode + val.substring(0,3) + sep + val.substring(3,20) + ext;
		return true;
	}
	if(val.length == 10)
	{
		fld.value= val.substring(0,3) + sep + val.substring(3,6) + sep + val.substring(6,20) + ext;
		return true;
	}
	if(val.length < 7)
	{
		status= 'The phone number you supplied for the '+fieldname(fld)+' field was too short.';
		return false;
	}
	if(val.length > 10)
	{
		status= 'The phone number you supplied for the '+fieldname(fld)+' field was too long.';
		return false;
	}
	status= 'The phone number you supplied for the '+fieldname(fld)+' field was wrong.';
	return false;
}

function nameContains(name,str)
{ // Check for nontrivial inclusion 
	// OK, *some* trivial cases must be handled...
	if(name == str || name.toLowerCase() == str.toLowerCase()) return true;
	var nlen= name.length;
	var slen= str.length;
	var endat= nlen - slen;
	// too small to fit?
	if(nlen > str) return false;
	if(name.toLowerCase() == name || name.toUpperCase() == name)
	{ // all lower/upper case name? underscores separate
		if(name.indexOf('_') == -1) return false;
		str= str.toLowerCase();
		if( name.indexOf(str+'_') == 0 ||
			name.indexOf('_'+str+'_') > -1 ||
			name.substring(endat-1,nlen+1) == ('_'+str) )
			return true;
	}
	else
	{ // proper case name? uppercase starts new words 
		var sep= name.substring(slen,slen+1);
		if( name.indexOf(str) == 0 && sep == sep.toUpperCase() ) return true;
		if( name.indexOf(str.toLowerCase()) == 0 && sep == sep.toUpperCase() ) return true;
		var sep= name.substring(endat-1,endat);
		if( name.substring(endat,nlen+1) == str ) return true;
		for(var index= name.indexOf(str); index > -1; index= name.indexOf(str,index+1))
		{ // for each occurence of the word, is it followed by a non-lowercase char? 
			endat= index+slen;
			sep= name.substring(endat,endat+1);
			if(sep == sep.toUpperCase()) return true;
		}
	}
	return false;
}

function autocheckByName(frm) 
{ // uses names of form elements to determine type 
	for(var index= 0; index < frm.elements.length; index++)
	{
		var el= frm.elements[index];
		if(!el.type) continue;
		if(el.type == 'text' || el.type == 'password')
		{ // text fields 
			if(( el.name.substring(0,1) == el.name.substring(0,1).toUpperCase() || 
				nameContains(el.name,'Required')) && el.value.length == 0)
			{ alert('The '+fieldname(el)+' field cannot be left blank.'); el.focus(); return false; }
			if(nameContains(el.name,'Date') && !fixDate(el))
			{ alert(status); el.focus(); return false; }
			if(nameContains(el.name,'Time24') && !fixTime24(el))
			{ alert(status); el.focus(); return false; }
			if(nameContains(el.name,'Time') && !fixTime(el))
			{ alert(status); el.focus(); return false; }
			if(nameContains(el.name,'SSN') && !fixSSN(el))
			{ alert(status); el.focus(); return false; }
			if(nameContains(el.name,'CC') && !fixCreditCard(el))
			{ alert(status); el.focus(); return false; }
			if(nameContains(el.name,'Email') && !checkEmail(el))
			{ alert(status); el.focus(); return false; }
			if( ( nameContains(el.name,'Phone') ||
				nameContains(el.name,'Fax') || 
				nameContains(el.name,'Pager') ) &&
				!fixPhone(el))
			{ alert(status); el.focus(); return false; }
		}
		// handle required select and select-multiple 
		else if(el.type.substring(0,3) == 'sel' && 
			(el.name.substring(0,1) == el.name.substring(0,1).toUpperCase() || 
			nameContains(el.name,'Required')) && el.selectedIndex == -1)
		{ alert(status); el.focus(); return false; }
		// handle required checkbox
		else if(el.type == 'checkbox' && 
			(el.name.substring(0,1) == el.name.substring(0,1).toUpperCase() || 
			nameContains(el.name,'Required')) && !requireChecked(el))
		{ alert(status); el.focus(); return false; }
		else if(el.type == 'radio' && !requireRadio(frm[el.name]))
		{ alert(status); frm.elements[index].focus(); return false; }
	}
	for(var index= 0; index < frm.elements.length; index++)
		if(frm.elements[index].type == 'submit') frm.elements[index].disabled= true;
	return true;
}

function isMemberOf(elem,classname)
{ // checks to see if elem is a member of the (style) class 
	// trivial cases first: no membership or simple equality
	if(!elem.className)
		return false
	else if(elem.className == classname)
		return true;
	else if(elem.className.indexOf(' ') > -1)
	{ // multiple class names; use split, if avail 
		if(parseInt(navigator.appVersion) >= 4)
		{
			var names= elem.className.split(' ');
			for(var index= 0; index < names.length; index++)
				if(names[index] == classname)
					return true;
		}
		// older browsers can fake it 
		// WARNING: "fine" can be found in "oldRefined"
		else if(elem.className.indexOf(classname) > -1)
			return true;
	}
	return false;
}

function checkClass(el)
{ // validate the field, based on class membership
	if(el.type == 'text' || el.type == 'password')
	{ // text fields 
		if(isMemberOf(el,'required') && !requireValue(el)) return false;
		if(isMemberOf(el,'date') && !fixDate(el)) return false;
		if(isMemberOf(el,'time') && !fixTime(el)) return false;
		if(isMemberOf(el,'time24') && !fixTime24(el)) return false;
		if(isMemberOf(el,'ssn') && !fixSSN(el)) return false;
		if(isMemberOf(el,'cc') && !fixCreditCard(el)) return false;
		if(isMemberOf(el,'phone') && !fixPhone(el)) return false;
		if(isMemberOf(el,'money') && !fixMoney(el)) return false;
		if(isMemberOf(el,'int') && !fixInt(el)) return false;
		if(isMemberOf(el,'float') && !fixFloat(el)) return false;
		if(isMemberOf(el,'email') && !checkEmail(el)) return false;
	} // handle required select and select-multiple 
	else if(el.type == 'checkbox' && 
		isMemberOf(el,'required') && !requireChecked(el)) return false;
	else if(el.type.substring(0,3) == 'sel' && 
		isMemberOf(el,'required') && el.selectedIndex == -1) return false;
	return true;
}

function autocheckByClass(frm) 
{ // uses the CSS class of form elements to determine type 
	for(var index= 0; index < frm.elements.length; index++)
	{
		var el= frm.elements[index];
		if(!el.type) continue;
		if(el.type == 'radio' && !requireRadio(frm[el.name]))
		{ alert(status); frm.elements[index].focus(); return false; }
		else if(!checkClass(frm.elements[index])) 
		{ alert(status); frm.elements[index].focus(); return false; }
	}
	for(var index= 0; index < frm.elements.length; index++)
		if(frm.elements[index].type == 'submit') frm.elements[index].disabled= true;
	return true;
}

function autocheckByBlur(frm)
{ // uses the onBlur handler of form elements to check value 
	status= '';
	for(var index= 0; index < frm.elements.length; index++)
	{
		var el= frm.elements[index];
		if(!el.type) continue;
		if(el.type == 'radio' && !requireRadio(frm[el.name]))
		{ alert(status); frm.elements[index].focus(); return false; }
		else if(el.type != 'hidden' && el.name && el.onblur)
		{
			el.onblur();
			if(status) { alert(status); el.focus(); return false; }
		}
	}
	for(var index= 0; index < frm.elements.length; index++)
		if(frm.elements[index].type == 'submit') frm.elements[index].disabled= true;
	return true;
}

function canCheckByBlur(frm)
{ // determines whether programmatic invocation of form element onblur is available
	for(var index= 0; index < frm.elements.length; index++)
	{
		var el= frm.elements[index];
		if(!el.type) continue;
		if(el.type != 'hidden' && el.name && typeof(el.onblur)=='function') return true;
	}
	return false;
}

function autocheck(frm)
{ // uses the best available method to check form values 
	var bchar= navigator.appName.substring(0,1);
	if(isMemberOf(frm,'autocheck'))
	{ return autocheckByClass(frm); }
	else if(canCheckByBlur(frm))
	{ return autocheckByBlur(frm); }
	else
	{ return autocheckByName(frm); }
}