jQuery Presentation to Rails Developers

jQuery + Ruby + Rails AppFolio - September 2007 Yehuda Katz (yehudakatz.com)

What is jQuery? • An open source JavaScript library that simpliﬁes the interaction between HTML and JavaScript.

Why jQuery? • Fully documented • Great community • Tons of plugins • Small size (14kb) • Everything works in IE 6+, Firefox, Safari 2+, and Opera 9+

Complete Focus: • Find some elements • Do something with them

Find Some Elements... • CSS 1-3 Support • Basic XPath via a Plugin • Better CSS support than most browsers

$(“div”) <div id=”body”> <h2>Some Header</h2> <div class=”contents”> <p>...</p> <p>...</p> </div> </div>

$(“#body”) <div id=”body”> <h2>Some Header</h2> <div class=”contents”> <p>...</p> <p>...</p> </div> </div>

$(“div > div”) <div id=”body”> <h2>Some Header</h2> <div class=”contents”> <p>...</p> <p>...</p> </div> </div>

$(“div:has(div)”) <div id=”body”> <h2>Some Header</h2> <div class=”contents”> <p>...</p> <p>...</p> </div> </div>

Features • Events (click, hover, toggle, namespaces) • DOM Manipulation (append, prepend, remove) • Effects%/em, colors) slideDown, fadeOut, stop, relative, (hide, show, queues, • AJAX (load, get, post, XD, JSONP)

Events • $(“form input:last”).click(function(){ $(“#menu”).slideDown(“slow”); });

Live Events • $(“form input:last”).livequery(“click, function(){ $(“#menu”).slideDown(“slow”); }); • With LiveQuery Ofﬁcial Plugin

DOM Manipulation • $(“a[target]”) .append(“ (Opens in New Window)”); • $(“#body”).css({ border: “1px solid green”, height: “40px” });

Effects • $(“#menu”).slideDown(“slow”); • $(“div”).hide(500,function(){ $(this).show(500); });

Relative Animations • $(“#foo”).animate({ left: “+50px” top: “-50px” }, “slow”)

AJAX • $(“#body”).load(“sample.html”); • $(“#body”).load(“sample.html #foo”); • $.getScript(“test.js”); • $.getScript(“http://jquery.com/jquery.js”);

Chaining • $(“div”).hide(); • $(“div”).hide().color(”blue”); • $(“div”).hide().color(”blue”).slideDown();

Live Demo

Accordion Menu

Plugins • Drag and Drop • Sortables • Tabbed Navigation • Sortable Tables • And hundreds more... • http://jquery.com/plugins

Community • Very active mailing list • 140+ Posts/Day • 2500+ Members • Technorati: 22+ blog posts per day

Who uses jQuery? • • IBM BBC • • MSNBC SourceForge • • Amazon Intuit • • AOL Salesforce • • Technorati FeedBurner • • Drupal WB Records • • Wordpress Linux.com • • Digg many others...

Books • 4 Books in Progress: • Learning jQuery (Packt) • jQuery Reference (Packt) • jQuery Quickly (Manning) • Designing with jQuery (Manning)

Future • “jQuery UI” - Next Sunday! • Themeing • Internationalization

Using jQuery with Rails • Most jQuery use is not different than normal jQuery use • $(“div”).remove(); // works on any site • Considerations come mainly in with dealing with Ajax requests

Ajax and Rails • Just another request to a controller/action • You might want to respond like so: respond_to do |format| format.js { # do stuff } end • jQuery sends the right headers so you can respond easily

Ajax with jQuery • Typically, you’ll reply with an HTML chunk • jQuery handles this gracefully: $(“#stuff”).load(“/controller/action”);

Reply with JSON • Sometimes you’ll want to reply with a data structure for further manipulation • ActiveRecord objects have to_json serialization built in: quot;{attributes:{foo: quot;barquot;, baz: quot;batquot;}}quot; • Or you can get speciﬁc: quot;{foo: quot;barquot;, baz: quot;batquot;}quot; @ar_object.attributes.to_json #=>

Where does the JS go? • jQuery dictates good separation of content, style, and behavior • Put all your code in application.js (just like style.css) • jQuery and Prototype can play nicely together: jQuery.noConﬂict(); jQuery(function($){ /* your code */ });

Where’s RJS? • RJS says that sending back code (from the server) is the best way to do things • This is overkill, simplify and extract what you’re trying to achieve

RJS v. jQuery-style • With RJS: id=’myid’ onclick=”return someFunction <a href=”#” (‘myid’);”>text</a> <a href=”#” id=’myid2’ onclick=”return someFunction (‘myid2’);”>text</a> • With jQuery: <a href=”...” id=”myid”>text</a> <a href=”...” id=”myid2”>text</a> <script>$(“a”).click(someFunction);</script>

jQuery & RJS • jQuery Doesn’t Agree with the philosophy that produced RJS • Send data, not code

Helpers • Say you have a link that makes an Ajax call and updates some div with the response: <a href='/foo/bar' rel='#baz' class='remote'>Update Baz</a> • You might write a simple line of jQuery code to handle it: $(quot;a.remotequot;).click(function() { $(this.rel).load(this.href) })

Helpers (cont.) • You could then write a Rails helper to reuse it: def remote_link text, url_hash, update = nil link_to(text, url_hash, :class => quot;remotequot;, :rel => update) end • You could thenBazquot;, {:controller => quot;fooquot;, call it as: remote_link quot;Update :action => quot;barquot;}, quot;#bazquot;

You still have your helpers :)

jQuery on Rails • Mainly Proof-of-Concept • Uses Hpricot to select jQuery snippets • Includes (POC) helpers for • Tab ﬁeld • Sortable table • More coming

More info: • jQuery with Rails: • http://yehudakatz.com/2007/01/31/using-jquery-in-rails-part-i/ • http://yehudakatz.com/2007/05/18/railsconf-talk-recap/ • jQuery Rails Plugin: • http://yehudakatz.com/2007/05/17/jquery-on-rails-a-fresh-approach/ • http://yehudakatz.com/2007/05/25/10/ • http://yehudakatz.com/2007/05/26/jquery-on-rails-a-still-very-alpha-update/

jquery.com docs.jquery.com - jquery.com/plugins More: visualjquery.com learningjquery.com

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jQuery Presentation to Rails Developers

by Yehuda Katz on Sep 14, 2007

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