JavaScript Libraries (Kings of Code)
Upcoming SlideShare
Loading in...5
×
 

JavaScript Libraries (Kings of Code)

on

  • 10,415 views

Kings of Code (May 2008).

Kings of Code (May 2008).

Statistics

Views

Total Views
10,415
Views on SlideShare
10,408
Embed Views
7

Actions

Likes
7
Downloads
267
Comments
0

2 Embeds 7

http://www.slideshare.net 4
http://lanyrd.com 3

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

JavaScript Libraries (Kings of Code) JavaScript Libraries (Kings of Code) Presentation Transcript

  • JavaScript Libraries John Resig - May 2008 http://ejohn.org/ http://twitter.com/jeresig/
  • Question: How do you want to write JavaScript?
  • 1) Plug-and-Play • Drop in a “calendar widget” or “tabbed navigation” • Little, to no, JavaScript experience required. • Just customize some options and go. • No flexibility.
  • 2) Some Assembly Required • Write common utilities • Click a link, load a page via Ajax • Build a dynamic menu • Creating interactive forms • Use pre-made code to distance yourself from browser bugs. • Flexible, until you hit a browser bug.
  • 3) Down-and-Dirty • Write all JavaScript code from scratch • Deal, directly, with browser bugs • Quirksmode is your lifeline • Excessively flexible, to the point of hinderance.
  • What we’ve just seen... • Widgets • Libraries • Raw JavaScript
  • What we’ve just seen... • Widgets • Libraries • Raw JavaScript
  • Why use a library? • Makes JavaScript bearable • Gets the job done fast • Simplifies cross-browser support • Sort of like C stdlib - no one just codes all of C by hand
  • What kind of libraries exist? Open Source Commercial Atlas Client/ AjaxCFC Backbase for Server Qcodo Struts Prototype Browser jQuery Backbase Only Yahoo UI SmartClient Dojo
  • What kind of libraries exist? Open Source Commercial Atlas Client/ AjaxCFC Backbase for Server Qcodo Struts Prototype Browser jQuery Backbase Only Yahoo UI SmartClient Dojo
  • Open Source Libraries Browser Only Client/Server Scriptaculous Task AjaxCFC moo.fx Specific Qcodo Open Rico Prototype General jQuery Ruby on Rails Purpose Yahoo UI CakePHP Dojo
  • Open Source Libraries Browser Only Client/Server Scriptaculous Task AjaxCFC moo.fx Specific Qcodo Open Rico Prototype General jQuery Ruby on Rails Purpose Yahoo UI CakePHP Dojo
  • Why these libraries?
  • Developer Survey jQuery Prototype Yahoo UI Dojo 14% 32% 22% 32% http://ajaxian.com/archives/nitobi-survey-results-on-ajax- development
  • Google Trends jQuery Prototype Dojo Yahoo UI http://google.com/trends?q=prototype+javascript%2C+jquery+javascript%2C+yui+javascript%2C+dojo+javascript&ctab=0&geo=all&date=all&sort=0
  • Others • MooTools • ExtJS • Ajax.NET
  • The Libraries
  • Prototype
  • Prototype: Overview • Started early 2005 by Sam Stephenson • Incredibly popular, tied with Ruby on Rails’ popularity • Development backed by 37 Signals
  • Prototype: Focus • Improving the usability of the JavaScript language • Big emphasis on adding in ‘missing’ JavaScript features • Clean structure, clean objects and ‘classes’
  • Prototype: Details • Code quality is fantastic, great features • All animations (and interactions) are in Scriptaculous • Updated frequently • Looking at Prototype 1.6.0.2
  • jQuery
  • jQuery: Overview • Released January 2006 by John Resig • Rapid rise in popularity • Many developers across the globe
  • jQuery: Focus • Improving the interaction between JavaScript and HTML • Finding elements then performing actions • Highly-effective, short, code
  • jQuery: Details • Core features are limited to DOM, Events, Effects, Ajax • Other features can be added in via plugins • Looking at jQuery 1.2.6
  • Yahoo! UI
  • YUI: Overview • Released Feb 2006 by Yahoo! • Maintained and financed internally • Attempt to standardize internal JavaScript • Say ‘hi’ to Nate Koechley!
  • YUI: Focus • Exposing, and solving, common methodologies • Looking for common idioms (Drag-and- Drop, Calendar, Auto-Complete) • Looking at Yahoo UI 2.5.1
  • Dojo
  • Dojo: Overview • Started early 2005 by Alex Russell + Co. • Large development community • Lots of corporate backing (IBM, AOL) • Big code base, tons of features
  • Dojo: Focus • Building complete web applications • A package heirarchy, e.g.: dojo.addClass( ... ) • Focus has transcended into widgets (Dijit) • Huge number of features • Today we’re looking at Dojo 1.1.1
  • What should a library have?
  • Code Base • Core Functionality • DOM • Events • Ajax • Animations • User Interface Widgets
  • Development • Good Architecture • Open Licensing • Wide Browser Support • Small File Size
  • Project • Development Team (Open, Funded) • Code in SVN / Bug Tracker • Good Unit Test Coverage
  • Documentation • Full API Coverage • Plenty of Tutorials • Some Books • Wide variety of Demos
  • Community • Active Mailing List / Forum • Support and Training • Popularity
  • Code Base • Core Functionality • DOM • Events • Ajax • Animations • User Interface Widgets
  • Core Functionality • Bare minimum needed to make a dynamic “Ajax” web site: • DOM (Traversal and Manipulation) • Events • Ajax • Animations
  • DOM • Traversal • Using CSS selectors to locate elements • Modification • Create/remove/modify elements • Having a DOM builder is important
  • DOM Traversal • Prototype: $$(“table > tr”) • jQuery: $(“div > p:nth-child(odd)”) • Dojo: dojo.query(“table tr:nth-child(even)”) • Yahoo UI: YAHOO.util.Selector.query('div p')
  • DOM Modification • Prototype: Insertion.Bottom(“list”,”<li>Another item</li>”); • jQuery: $(“#li”).append(“<li>An item</li>”); • Dojo and Yahoo UI have weak support - no DOM building capabilities, basic property modification
  • Events • Support for simple event binding/removal • Support for custom events is essential • Prototype: Event.observe(“button”,”click”, function(){ alert(“Thanks for the click!”); }); • jQuery: $(“div”).click(function(){ alert(“div clicked”); });
  • Events (cont.) • Yahoo UI: YAHOO.util.Event.addEventListener(“list”, “click”, function(){ alert(“List Clicked”); }); • Dojo: dojo.connect(dojo.byId(quot;mylinkquot;), quot;clickquot;, function(){ alert(“Link clicked”); });
  • Custom Events • $(“#list”).bind(“drag”, function(){ $(this).addClass(“dragged”); }); • $(“#test”).trigger(“drag”);
  • Ajax • Request and load remote documents • Prototype: new Ajax.Request(“test.html”, { method: “GET”, onComplete: function(res){ $(‘results’).innerHTML = res.responseText; } }); • jQuery: $(“#results”).load(“test.html”);
  • Ajax (cont.) • Yahoo UI YAHOO.util.Connect.asyncRequest( 'GET', “test.html”, function(data){ YAHOO.util.Dom.id(“results”).innerHTML = data; } ); • Dojo dojo.io.bind({ url: quot;test.htmlquot;, method: quot;getquot;, mimetype: quot;text/htmlquot;, load: function(type, data) { dojo.byId(“results”).innerHTML = data; } });
  • Ajax (cont.) • jQuery is only one capable of doing DOM traversing over XML • jQuery.get(“test.xml”, function(xml){ $(“user”, xml).each(function(){ $(“<li/>”).text( $(this).text() ) .appendTo(“#userlist”); }); });
  • Animations • Simple animations (hide/show/toggle) • Provide elegant transitions • No animations in Prototype Core (see Scriptaculous, instead) • jQuery: $(“#menu”).slideDown(“slow”);
  • Animations (cont.) • Yahoo UI: new YAHOO.util.Anim(“list”, { width: { from: 10, to: 100 } }, 1, YAHOO.util.Easing.easeOut ); • Dojo: dojo.fadeOut({ node: dojo.byId(“list”), duration: 500 });
  • Core Feature Summary DOM Events Anim. Ajax Prototype X X - X jQuery X X X X Yahoo UI / X X X Dojo / X X X
  • User Interface Widgets • Difficult to implement components, made easy • Commonly used, save duplication • Some common components: Drag & Drop, Tree, Grid, Modal Dialog, Tabbed Pane, Menu / Toolbar, Datepicker, Slider
  • User Interface Packages • Only looking at officially-supported code: • Prototype has Scriptaculous • jQuery has jQuery UI • Dojo has Dijit • Included in Yahoo UI
  • Drag & Drop • Drag an item from one location and drop in an other • Supported by all libraries
  • Tree • A navigable hierarchy (like a folder/file explorer) • In Dojo and Yahoo UI
  • Grid • An advanced table (resizable, editable, easily navigable) • In Dojo and Yahoo UI
  • Modal Dialog • Display confined content (usually drag & droppable) and confirmation dialogs • In Dojo,Yahoo UI, and jQuery
  • Tabbed Pane • Multiple panes of content navigable by a series of tabs • In Dojo,Yahoo UI, and jQuery
  • Menu / Toolbar • A list of navigable items (with sub-menus) • In Dojo and Yahoo UI
  • Datepicker • An input for selecting a date (or a range of dates) • In Dojo,Yahoo UI, and jQuery
  • Slider • A draggable input for entering a general, numerical, value • In all libraries
  • Tons More! • Color Picker (Dojo,YUI) • Layout (Dojo,YUI) • Auto Complete (Dojo, Proto,YUI) • Selectables (Proto, jQuery) • Accordion (Dojo, jQuery) • WYSIWYG (Dojo,YUI)
  • Themeing • A consistent look-and-feel for widgets • jQuery,Yahoo UI, and Dojo provide themeing capabilities • jQuery’s and Yahoo UI’s are documented
  • Accessibility • Taking in to consideration points from ARIA (Accessible Rich Internet Applications) • Dojo is taking a solid lead, here • jQuery received funding and is working on ARIA integration to jQuery UI
  • Development • Good Architecture • Open Licensing • Wide Browser Support • Small File Size
  • Architecture • Bottom Up (Prototype, jQuery) vs. Top Down (Dojo,Yahoo UI) • jQuery, Dojo, and Yahoo UI all use a single namespace • Prototype extends native objects (high likelihood of inter-library conflict) • jQuery is extensible with plugins • Dojo uses a package system
  • Licensing • All use liberal licenses (“Keep my name on the file, don’t sue me.”) • MIT: Prototype, jQuery • BSD: Yahoo UI, Dojo
  • Browser Support • Everyone supports: IE 6+, Firefox 2+, Safari 2+, Opera 9+ • Note: • Most are in the process of dropping support for Safari 2
  • File Size • Serving your JavaScript minified + Gzipped • Optimal level of compression and speed • Core file size (in KB): 35.00 26.25 17.50 8.75 0 Prototype jQuery Yahoo UI Dojo
  • Project • Development Team (Open, Funded) • Code in SVN / Bug Tracker • Good Unit Test Coverage
  • Development Team • Prototype, jQuery, and Dojo all have open development (anyone can contribute) • jQuery,Yahoo UI, and Dojo all have paid, full-time, developers working on the code • All have paid, part-time, developers
  • SVN / Bug Tracker • Prototype, jQuery, and Dojo all have code in a public SVN repositories • Yahoo UI’s development is private and is limited to Yahoo employees • They’re working to fix this! • All libraries have a public bug tracker
  • Unit Tests • All libraries have some automated unit tests • jQuery,Yahoo UI, and Dojo all have public unit test URLs • jQuery and Dojo have tests that can run in Rhino
  • Documentation • Full API Coverage • Plenty of Tutorials • Some Books • Wide variety of Demos
  • API Documentation • Prototype, jQuery, and Yahoo UI all have full coverage • jQuery provides runnable examples with each API item • Dojo’s coverage is improving - work in progress (dojocampus.org, etc.)
  • Tutorials • All libraries provide some tutorials • jQuery,Yahoo UI, and Dojo have screencasts/presentations • Prototype: 6 • jQuery: 118 (English) • Yahoo UI: Numerous (each component has at least one) • Dojo: 24
  • Books • Prototype: • Prototype and Scriptaculous in Action (Manning) • Prototype and Scriptaculous (Pragmatic) • jQuery: • Learning jQuery (Packt) • jQuery Reference Guide (Packt) • Yahoo UI: • Learning the Yahoo UI Library (Packt) • Dojo: 3 books coming in 2008
  • Demos • Yahoo UI provides a considerable number of live demos and examples for all features • jQuery provides live examples and a few demo applications • Dojo provides demo applications for their widgets
  • Community • Active Mailing List / Forum • Support and Training • Popularity
  • Mailing List / Forum • Prototype, jQuery, and Yahoo UI have mailing lists • Prototype: 23 posts/day • jQuery: 76 posts/day • Yahoo UI: 56 posts/day • Dojo has an active forum
  • Support and Training • Dojo provides paid support and training (via Sitepen) • jQuery provides paid jQuery UI support and training (via Liferay)
  • Popularity • Who uses what: • Prototype: Apple, ESPN, CNN, Fox News • jQuery: Google, Amazon, Digg, NBC, Intel • Yahoo:Yahoo, LinkedIn, Target, Slashdot • Dojo: IBM, AOL, Mapquest, Bloglines
  • More Information • Prototype: http://prototypejs.org/ • jQuery: http://jquery.com/ • Yahoo UI: http://developer.yahoo.com/yui/ • Dojo: http://dojotoolkit.org/