你如何限制CoffeeScript（或JavaScript）执行到Rails 3.1中的特定控制器和操作？ [英] How do you limit CoffeeScript (or JavaScript) execution to a particular controller and action in Rails 3.1?

问题描述

新的Rails 3.1资源管道非常不错，但由于所有CoffeeScript（或JavaScript）文件被整合到每个页面中包含的单个文件中，因此会出现以下问题：

如何将我的脚本的执行限制到特定的控制器或操作？在我的CoffeeScript中有一种方法知道在请求期间使用了哪个控制器和操作，以便我可以把条件语句放在我的脚本中？

或者我接近这个

> Trevor Burnham 在这里很好地回答了这个问题： rails 3.1 rc1 javascript and asset pipeline

他说：

有两种常见的方法：

1. 使行为以特定元素的存在为条件。对于
   实例，运行注册表
   的代码应该以

   
   
   

   '）.length> 0




2. 使行为以 body 元素上的类为条件。你可以
   使用ERB设置body类。这是
   经常需要的样式表为
   好​​。代码将是

   
   
   

   if $（'body'）。hasClass'user'




如果您对CoffeeScript感兴趣，Trevor正在编写一本书，非常好： http://pragprog.com/titles/tbcoffee/coffeescript

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?

解决方案

Trevor Burnham answers this question nicely here: rails 3.1 rc1 javascript and asset pipeline

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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