JavaScript Testing with Screw.Unit

Posted by Larry Karnowski Sat, 31 Jan 2009 19:42:00 GMT

I've been quietly hacking away on integrating three great tools:

  • Screw.Unit, a wonderful RSpec-like JavaScript testing framework
  • env.js, a wonderful fake JavaScript DOM implementation
  • Ruby on Rails plugins

What does that get me? Voila! Easy headless and in-browser testing of my unobtrusive JavaScript! (For more information on Screw.Unit, I also created a mailing list with the original authors' permission.)

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Playing MP3s with Rails! (SoundManager2 Rails Plugin)

Posted by Larry Karnowski Fri, 07 Mar 2008 14:55:00 GMT

So you want to play MP3s from your web application? The best tool I've found for that is Scott Schill's SoundManager2 Javascript API. It invisibly uses a very small Flash object to play the MP3s, and the whole thing is very scriptable through Javascript. Getting it set up is not difficult, but it's a little bit of a pain -- so I wrote a Rails plugin!

Here's what you do:

  • Install the Rails plugin like this: ./script/plugin install http://soundmanager2.rubyforge.org/svn/soundmanager2

  • Then run the generator to get the SoundManager2 files in your app: ./script/generate sound_manager2

  • You'll notice the following files are created: public/soundmanager2.swf
    public/javascripts/soundmanager2.js
    public/javascripts/soundmanager2-jsmin.js
    public/javascripts/soundmanager2-rails.js
    public/images/SoundManager2/pause-control.gif
    public/images/SoundManager2/play-control.gif

  • Then, to add basic play/stop functionality to your view, add the following to your ERB file:

<%= javascript_include_tag :defaults %>

<%= 
  sounds = [
      ["sound1", "http://url/to/sound1.mp3"],
      ["sound2", url_for(:controller => "sounds", :action => "listen", :id => "2")],
  ]
%>  

<%= initialize_sounds(sounds) %>

<div>Play sound 1: <%= toggle_sound "sound1" %></div> 
<div>Play sound 2: <%= toggle_sound "sound2" %></div>
  • Or, if you want more functionality, start calling the SoundManager2 Javascript APIs directly.

Here are some screenshots of this plugin in action. Here you're looking at part of a table with MP3s ready to play...

And then here you've clicked on the middle song. Note the MP3 will start playing immediately, even while it's downloading!

Clicking the "pause" button will stop the playback.

Here are the project links:

Oh, and by the way, both the Javascript API and Rails plugins are released with BSD/MIT licenses!

I'm definitely wanting to put more "off-the-shelf" behavior in this plugin, but for now the simple play/stop behavior is all my application needs. If you need something else, or want to send me some patches, please shoot me an email!

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