• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
JavaScript Libraries
 

JavaScript Libraries

on

  • 1,449 views

 

Statistics

Views

Total Views
1,449
Views on SlideShare
1,449
Embed Views
0

Actions

Likes
1
Downloads
8
Comments
0

0 Embeds 0

No embeds

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 JavaScript Libraries Presentation Transcript

    • JavaScript Libraries Ajax Experience - October 2007 John Resig (ejohn.org)
    • 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 C by hand
    • What kind of libraries exist? Open Source Commercial Atlas Client/ AjaxCFC Backbase for Server Qcodo Struts Prototype Browser Dojo Backbase Only jQuery SmartClient Yahoo UI
    • What kind of libraries exist? Open Source Commercial Atlas Client/ AjaxCFC Backbase for Server Qcodo Struts Prototype Browser Dojo Backbase Only jQuery SmartClient Yahoo UI
    • Open Source Libraries Browser Only Client/Server Scriptaculous Task AjaxCFC moo.fx Specific Qcodo Open Rico Prototype General Dojo Ruby on Rails Purpose jQuery CakePHP Yahoo UI
    • Open Source Libraries Browser Only Client/Server Scriptaculous Task AjaxCFC moo.fx Specific Qcodo Open Rico Prototype General Dojo Ruby on Rails Purpose jQuery CakePHP Yahoo UI
    • Why these libraries?
    • Ajaxian Survey Prototype jQuery Yahoo UI Dojo 20% 35% 21% 25% http://ajaxian.com/archives/ajaxian-2007-survey-results
    • Google Trends Prototype jQuery 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
    • 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
    • Prototype: Docs & Community • Documentation: Good Official API documentation, some tutorials • Community: Distributed Many bloggers love Prototype, little centralized discussion (23 posts/day).
    • Prototype: File Size & Popularity • File Size: Moderate (99KB) Unfortunately, not easily compressible with Packer - they recommend GZIP. • Popularity: Strong Apple, ESPN, CNN, Fox News
    • 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
    • jQuery: Docs & Community • Documentation: Complete Fully documented, complete API. • Community: Vibrant 108+ Mailing List Posts/Day
    • jQuery: File Size & Popularity • File Size: Small About 20KB with everything. • Popularity: Strong Users: IBM, Technorati, MSNBC, Digg Projects: Drupal, Wordpress
    • Yahoo! UI
    • YUI: Overview • Released Feb 2006 by Yahoo! • Maintained and financed internally • Attempt to standardize internal JavaScript
    • YUI: Focus • Exposing, and solving, common methodologies • Looking for common idioms (Drag-and- Drop, Calendar, Auto-Complete)
    • YUI: Details • Namespaces can become quite verbose. It is recommended that you copy namespaces to other variables. var dom = YAHOO.util.Dom; • Closed development (Yahoo employees only, no subversion repository)
    • YUI: Docs & Community • Documentation: Excellent Everything is thoroughly documented. Lots of explanations, plenty of demos. • Community: Moderate Mailing List hovering around 36 posts/day.
    • YUI: File Size & Popularity • File Size: 40KB (Compressed) Code is quite modular, you can remove un- used code easily. • Popularity: Possibly Waning Many good bloggers use to talk about it - have moved on.
    • Dojo
    • Dojo: Overview • Started early 2005 by Alex Russell • 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 0.9
    • Dojo: Docs & Community • Documentation: Rough. In the middle of a major documentation overhaul for 0.9. • Community: Lively Active forum with frequent discussions.
    • Dojo: File Size & Popularity • File Size: Large (100Kb compressed) It’s highly recommended that you remove unused modules. • Popularity: Substantial Backing from many corporate sponsors (IBM).
    • 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: No querying support
    • 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("mylink"), "click", function(){ alert(“Link clicked”); });
    • 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: "test.html", method: "get", mimetype: "text/html", load: function(type, data) { dojo.byId(“results”).innerHTML = data; } });
    • 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
    • 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 • jQuery is extensible with plugins
    • 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+ • Except: • Prototype doesn’t support Opera • Dojo is dropping support for Safari 2
    • File Size • Serving your JavaScript minified + Gzipped • Optimal level of compression and speed • Core file size: 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 repositor • Yahoo UI’s development is private and is limited to Yahoo employees • 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 tests • 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 spotty - work in progress
    • Tutorials • All libraries provide some tutorials • jQuery and Yahoo UI have screencasts • Prototype: 6 • jQuery: 68 • Yahoo UI: X • Dojo: X
    • Books • Prototype: • Prototype and Scriptaculous in Action • Prototype and Scriptaculous (Pragmatic) • jQuery: • Learning jQuery (Packt) • jQuery Reference Guide (Packt) • Yahoo UI: None • Dojo: A short online book
    • 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: 108 posts/day • Yahoo UI: 36 posts/day • Dojo has an active forum
    • Support and Training • Dojo provides paid support and training (via Sitepen)
    • Popularity • Who uses what: • Prototype: Apple, ESPN, CNN, Fox News • jQuery: Google, Amazon, Digg, NBC, Intel • Yahoo:Yahoo, LinkedIn, Target, Slashdot • Dojo: IBM, AOL
    • More Information • Prototype: http://prototypejs.org/ • jQuery: http://jquery.com/ • Yahoo UI: http://developer.yahoo.com/yui/ • Dojo: http://dojotoolkit.org/
    • Ajax Experience Presentations • Presentations on: • Dojo (2) • Prototype (2) & Scriptaculous (1) • jQuery (3) • Go to one that sounds interesting and enjoy!