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    <p>Put your own javascript &amp; coffeescript under <code>app/assets/javascripts</code>.</p> <p>Take a look inside <code>app/assets/javascripts/application.js</code>. When you ran <code>rails new APP</code> it should have added <code>//= require_tree .</code> to this file. <a href="http://guides.rubyonrails.org/asset_pipeline.html">See section 2.3 for more</a>.</p> <p>This is a special instruction that <a href="http://jackdempsey.me/2011/04/22/rails-3-1-sprockets-and-coffeescript.html">Sprockets</a> understands that wil automatically include all files in the same directory as your <code>application.js</code> file and in subfolders below it.</p> <p>If you want jquery and jquery-ui to be loaded your application.js file should look like</p> <pre><code>//= require jquery //= require jquery-ui //= require jquery_ujs //= require_tree . </code></pre> <p>If you have <a href="https://github.com/rails/jquery-rails"><code>gem 'jquery-rails'</code></a> in your bundle, this gem has already added the jquery files to the asset pipeline for you, so you <strong>don't have to worry about downloading them manually</strong>.</p> <p>In your head section of your application view you will want to include <code>javascript_include_tag "application"</code> in the head section. Chances are, if you used the generator, it's already there.</p> <p>Please read up on the <a href="http://guides.rubyonrails.org/asset_pipeline.html">Rails Asset Pipeline</a> for more information.</p> <hr> <p>The <code>.</code> in the line with <code>require_tree</code> is referencing the location of the current file. The <code>//=</code> operator is referencing the asset pipeline.</p> <p>Placing a file in app/assets, lib/assets or vendor/assets will add it to the asset pipeline. <a href="http://guides.rubyonrails.org/asset_pipeline.html">See section 2.1</a>.</p>
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    1. PORails 3.1 newbie : where should I put javascript code?
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    1. COwhat is require tree?
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    2. CO@ Alex, you still get me confused, I am asking about the place where to put 3rd party library and where to put my own js file. And I am also confused about the usage and meaning of application.js . Is require_tree in application.js is used to include 3rd-party libraries under app/vendor/assets/javascript and require "something" in application.js is used to include js file under app/assets/javascripts?? Am I right?
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    3. COIn order to include a file that's in your asset pipeline, you should reference it in the correct order in your application.js. Your own javascript is excepted if you put it in `app/assets/javascripts` and use `require_tree .` in your application.js which is stored in this location.
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