jQuery Roundup: 1.7 RC1, $.Callbacks, jquery.rss, sessionTimeout

2011-10-25 00:00:00 +0100 by Alex R. Young
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jQuery 1.7 RC1

jQuery 1.7 RC1 has
been released. Meanwhile, the jQuery Standards

has been created, which aims to represent jQuery users to standards
bodies such as the W3C and TC39.

The jQuery Standards Team is driven by jQuery team members Yehuda Katz and Paul Irish who some of you may know. Yeuhda and Paul have extenstively worked with standards bodies and browser vendors in a number of capacities over the years.

Demystifying jQuery 1.7's \$.Callbacks

In Demystifying jQuery 1.7's
, Addy Osmani explains the origins of \$.Callbacks and
provides detailed examples on how to use it.

The general idea behind pub/sub (the Observer pattern) is the promotion of loose coupling in applications. Rather than single objects calling on the methods of other objects, an object instead subscribes to a specific task or activity of another object and is notified when it occurs.

Looking at the source in in jQuery 1.7 is interesting because
\$.Callbacks is now used in several places. For example,
the new
deferred.js is built with it, and
ajax.js is as well.

I was trying to compare Node's EventEmitter with
\$.Callbacks and discovered Comparison Between Different
Observer Pattern

by Miller Medeiros, which is an interesting post on this subject.


jquery.rss (License: MIT) by Sascha Depold and DaWanda GmbH is an RSS reading and transformation
library. It uses the Google Feed
to download feeds straight from
the browser. It comes complete with support for simple templates and

$("#rss-feeds").rss("http://feeds.feedburner.com/premiumpixels", {
  // how many entries do you want? default: 4
  limit: 10,

  // will request the API via https; default: false
  ssl: true,

  // template for the html transformation
  // default: "{entry}[{author}@{date}] {title}{shortBodyPlain}{/entry}"
  template: "{entry}{title}{/entry}",

  // additional token definition for in-template-usage
  // default: {}
  tokens: {
    foo: 'bar',
    bar: function(entry, tokens) { return entry.title }


sessionTimeout (Source: jquery.sessionTimeout.1.0.js) is a simple plugin for handling session timeouts in the browser. It will
poll a URL, and show a jQuery UI dialog when the time limit has been

  message :     'Your session is about to expire.'
, keepAliveUrl: '/sessions/alive'
, redirUrl:     '/sessions/timed-out'
, logoutUrl:    '/sessions/destroy'
, warnAfter:    900000
, redirAfter:   1200000