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I've downloaded a javascript file called jquery.jsPlumb-1.2.6 and placed in my public/javascripts directory.

I want access to this file in one particular html.erb and several js.erbs. What is the best way to do that?

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You can either use <%= javascript_include_tag :defaults %> in the HEAD section of your page (recommended): This function will return references to the JavaScript files created by the rails command in your public/javascripts directory. Using it is recommended as the browser can then cache the libraries instead of fetching all the functions anew on every request.

Or you can use<%= javascript_include_tag 'prototype' %>: As above, but will only include the Prototype core library, which means you are able to use all basic AJAX functionality. For the Scriptaculous-based JavaScript helpers, like visual effects, autocompletion, drag and drop and so on, you should use the method described above.

More info here mate.

http://api.rubyonrails.org/classes/ActionView/Helpers/JavaScriptHelper.html

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But I have downloaded a file that is not prototype or jquery... How do I include a file named sdfsdfdsf.js is my question. Not how to include prototype.
i think it would be <%= javascript_include_tag 'example.js' %>
For anyone reading this in 2017, :defaults does not appear to be a special argument to javascript_include_tag (or, at least not in Rails 5) — ActionView simply tries to load defaults.js from the asset pipeline.

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