/*

	-- -- -- -- -- -- --
	form handling javascript
	-- -- -- -- -- -- --

	File Contents:
	Functions to deal with various forms.
	
*/




/*
	FUNCTION: checkform
	Form input validation, courtesy Christian Heilmann
	http://onlinetools.org/articles/unobtrusivejavascript/chapter5.html
*/
function checkform(of)
{
// Test if DOM is available and there is an element called required
	if(!document.getElementById || !document.createTextNode){return;}
	if(!document.getElementById('required')){return;}

// Define error messages and split the required fields
	var errorID='error-message';
	var errorClass='error'
	var errorMsg='Please make sure that you\'ve filled in the highlighted fields above, and that you have entered a valid email address. Thanks!';
	var reqfields=document.getElementById('required').value.split(',');

// Cleanup old mess
	// if there is an old errormessage field, delete it
	if(document.getElementById(errorID))
	{
		var em=document.getElementById(errorID);
		em.parentNode.removeChild(em);
	}
	// remove old classes from the required fields
	for(var i=0;i<reqfields.length;i++)
	{
		var f=document.getElementById(reqfields[i]);
		if(!f){continue;}
		f.className='';
	}
// loop over required fields
	for(var i=0;i<reqfields.length;i++)
	{
// check if required field is there
		var f=document.getElementById(reqfields[i]);
		if(!f){continue;}
// test if the required field has an error, 
// according to its type
		switch(f.type.toLowerCase())
		{
			case 'text':
				if(f.value=='' && f.id!='email'){cf_adderr(f)}							
// email is a special field and needs checking
				if(f.id=='email' && !cf_isEmailAddr(f.value)){cf_adderr(f)}							
			break;
			case 'textarea':
				if(f.value==''){cf_adderr(f)}							
			break;
			case 'checkbox':
				if(!f.checked){cf_adderr(f)}							
			break;
			case 'select-one':
				if(!f.selectedIndex && f.selectedIndex==0){cf_adderr(f)}							
			break;
		}
	}
	return !document.getElementById(errorID);

	/* Tool methods */
	function cf_adderr(o)
	{
		// colourize the error fields
		o.className=errorClass;

	// Check if there is no error message
		if(!document.getElementById(errorID))
		{
		// create errormessage and insert before submit button
			var em=document.createElement('span');
			em.id=errorID;
			em.appendChild(document.createTextNode(errorMsg))
			// find the submit button 
			for(var i=0;i<of.getElementsByTagName('input').length;i++)
			{
				if(/submit/i.test(of.getElementsByTagName('input')[i].type))
				{
					var sb=of.getElementsByTagName('input')[i];
					break;
				}
			}
			if(sb)
			{
				sb.parentNode.appendChild(em,sb);
			}	
		} 
	}
	function cf_isEmailAddr(str) 
	{
		// edited to add + sign recognition (GMail)
		return str.match(/^[\w-\+]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/);
	}
}








/*
	REMEMBER ME FUNCTIONS
	Functions below adapted from MT default installation
*/



// Copyright (c) 1996-1997 Athenia Associates.
// http://www.webreference.com/js/
// License is granted if and only if this entire
// copyright notice is included. By Tomer Shiran.

function setCookie (name, value, expires, path, domain, secure) {
    var curCookie = name + "=" + escape(value) + (expires ? "; expires=" + expires : "") +
        (path ? "; path=" + path : "") + (domain ? "; domain=" + domain : "") + (secure ? "secure" : "");
    document.cookie = curCookie;
}

function getCookie (name) {
    var prefix = name + '=';
    var c = document.cookie;
    var nullstring = '';
    var cookieStartIndex = c.indexOf(prefix);
    if (cookieStartIndex == -1)
        return nullstring;
    var cookieEndIndex = c.indexOf(";", cookieStartIndex + prefix.length);
    if (cookieEndIndex == -1)
        cookieEndIndex = c.length;
    return unescape(c.substring(cookieStartIndex + prefix.length, cookieEndIndex));
}

function deleteCookie (name, path, domain) {
    if (getCookie(name))
        document.cookie = name + "=" + ((path) ? "; path=" + path : "") +
            ((domain) ? "; domain=" + domain : "") + "; expires=Thu, 01-Jan-70 00:00:01 GMT";
}

function fixDate (date) {
    var base = new Date(0);
    var skew = base.getTime();
    if (skew > 0)
        date.setTime(date.getTime() - skew);
}

function rememberMe (f) {
    var now = new Date();
    fixDate(now);
    now.setTime(now.getTime() + 365 * 24 * 60 * 60 * 1000);
    now = now.toGMTString();
    if (f.author != undefined)
       setCookie('mtcmtauth', f.author.value, now, '/', '', '');
    if (f.email != undefined)
       setCookie('mtcmtmail', f.email.value, now, '/', '', '');
    if (f.url != undefined)
       setCookie('mtcmthome', f.url.value, now, '/', '', '');
}

function forgetMe (f) {
    deleteCookie('mtcmtmail', '/', '');
    deleteCookie('mtcmthome', '/', '');
    deleteCookie('mtcmtauth', '/', '');
    f.email.value = '';
    f.author.value = '';
    f.url.value = '';
}

function hideDocumentElement(id) {
    var el = document.getElementById(id);
    if (el) el.style.display = 'none';
}

function showDocumentElement(id) {
    var el = document.getElementById(id);
    if (el) el.style.display = 'block';
}

var commenter_name;

window.onload = function() {
	var f = document.getElementById("comments_form");
    if (f) {
        if ((f.email != undefined) &&
            (mtcmtmail = getCookie("mtcmtmail")))
            f.email.value = mtcmtmail;
        if ((f.author != undefined) &&
            (mtcmtauth = getCookie("mtcmtauth")))
            f.author.value = mtcmtauth;
        if (f.url != undefined && 
            (mtcmthome = getCookie("mtcmthome")))
            f.url.value = mtcmthome;
        if (f["bakecookie"]) {
            if (mtcmtauth || mtcmthome) {
                f.bakecookie.checked = true;
            } else {
                f.bakecookie.checked = false;
            }
        }
    }
}