PersistentFader
with Alexis Lagimodière-Grisé
Fressen, Halifax, NS
// craigleonard.persistentFader()

var craigleonard = {};

craigleonard.persistentFader = function(selector, options){
var fader = this,
target = $(selector),
opts = {
cook_key: 'clfc',
start: 100,
effect_duration: 200,
end: 0,
interval: 25,
reset_after: 365,
on_refresh: false
};

$.extend(opts, options, true);
var cookie_opts = { expires: opts.reset_after };
target.css('opacity', opts.start);

var finished = function(c){
if(opts.start > opts.end){
return !(c > opts.end);
}
else return !(c < opts.end);
}
if($.cookie(opts.cook_key)){
var cremented = 0;
if(!opts.on_refresh){
if($.cookie(opts.cook_key+'dont_refresh')) cremented = $.cookie(opts.cook_key);
else{
cremented = (opts.start > opts.end) ? $.cookie(opts.cook_key)-opts.interval : parseInt($.cookie(opts.cook_key))+opts.interval;
$.cookie(opts.cook_key+'dont_refresh','true');
}
}
else cremented = (opts.start > opts.end) ? $.cookie(opts.cook_key)-opts.interval : parseInt($.cookie(opts.cook_key))+opts.interval;
if(!finished(cremented)){
target.fadeTo(opts.effect_duration, cremented/100);
$.cookie(opts.cook_key, cremented, cookie_opts);
}
else {
target.fadeTo(opts.effect_duration, opts.end/100);
if($.cookie(opts.cook_key) != opts.end) $.cookie(opts.cook_key, opts.end, cookie_opts);
}
}
else{
$.cookie(opts.cook_key, opts.start, cookie_opts);
}

}


/**
* Cookie plugin
*
* Copyright (c) 2006 Klaus Hartl (stilbuero.de)
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
*/

/**
* Create a cookie with the given name and value and other optional parameters.
*
* @example $.cookie('the_cookie', 'the_value');
* @desc Set the value of a cookie.
* @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
* @desc Create a cookie with all available options.
* @example $.cookie('the_cookie', 'the_value');
* @desc Create a session cookie.
* @example $.cookie('the_cookie', null);
* @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
* used when the cookie was set.
*
* @param String name The name of the cookie.
* @param String value The value of the cookie.
* @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
* @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
* If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
* If set to null or omitted, the cookie will be a session cookie and will not be retained
* when the the browser exits.
* @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
* @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
* @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
* require a secure protocol (like HTTPS).
* @type undefined
*
* @name $.cookie
* @cat Plugins/Cookie
* @author Klaus Hartl/klaus.hartl@stilbuero.de
*/

/**
* Get the value of a cookie with the given name.
*
* @example $.cookie('the_cookie');
* @desc Get the value of a cookie.
*
* @param String name The name of the cookie.
* @return The value of the cookie.
* @type String
*
* @name $.cookie
* @cat Plugins/Cookie
* @author Klaus Hartl/klaus.hartl@stilbuero.de
*/
jQuery.cookie = function(name, value, options) {
if (typeof value != 'undefined') { // name and value given, set cookie
options = options || {};
if (value === null) {
value = '';
options.expires = -1;
}
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
// CAUTION: Needed to parenthesize options.path and options.domain
// in the following expressions, otherwise they evaluate to undefined
// in the packed version for some reason...
var path = options.path ? '; path=' + (options.path) : '';
var domain = options.domain ? '; domain=' + (options.domain) : '';
var secure = options.secure ? '; secure' : '';
document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
} else { // only name given, get cookie
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
// Does this cookie string begin with the name we want?
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};

// written by Daniel Espeset, Oct. 25 2010
Daniel Espeset
What Happens in Offenbach Stays in Halifax
with Lisa Hopf
and Marina Kampka
Festival der jungen Talente, Offenbach, Germany