在 Rails 3.1 中，如何将 CoffeeScript(或 JavaScript)的执行限制为特定的控制器和动作?

How do you limit CoffeeScript (or JavaScript) execution to a particular controller and action in Rails 3.1?(在 Rails 3.1 中，如何将 CoffeeScript(或 JavaScript)的执行限制为特定的控制器和动作?)

问题描述

The new Rails 3.1 asset pipeline is really nice, but since all CoffeeScript (or JavaScript) files get melded down into a single file that is included in every page, it raises this question:

How do I limit the execution of my script to a particular controller or action? Is there a way within my CoffeeScript to know which controller and action was used during the request so that I can put conditional statements in my script?

Or am I approaching this the wrong way altogether?

Trevor Burnham answers this question nicely here: How do I associate a CoffeeScript file with a view?

He says:

There are two common approaches:

1. Make behavior conditional on the presence of a particular element. For instance, code to run a signup sheet should be prefaced with something like

   if $('#signup').length > 0

2. Make behavior conditional on a class on the body element. You can set the body class using ERB. This is often desirable for stylesheets as well. The code would be something like

   if $('body').hasClass 'user'

And if you're interested in CoffeeScript, Trevor is working on a book that looks to be very good: http://pragprog.com/titles/tbcoffee/coffeescript

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