从ruby控制器有条件地设置CSS样式 [英] Conditionally setting CSS style from ruby controller

问题描述

我试图动态地改变（如果它点击）一个普通的表头（这是一个链接）到另一个定义的CSS类'th.hilite'。此链接只是对此列进行排序，每次用户对列表进行排序时，标题都应突出显示。

I'm trying to dynamically change (if it got clicked) a normal table header (which is a link) to another defined CSS class 'th.hilite'. This link simply sorts this column and the header should got highlighted every time a user sorts the list.

应该更改相关类别的视图，如下所示：

The view where the class in question should be changed, looks like this:

%table#mytable
  %thead
    %tr
      %th= link_to 'Title', mytable_path(:sort => 'title'), :id => 'title_header'

我的问题是：如何以及在哪里可以动态设置类

My question is simply: How and where could I dynamically set the class to %th.hilite if the header is clicked?

推荐答案

注意不要将逻辑（即使是条件）放在你的意见，如果你能找到一个方法。为了避免这种常见错误，您需要充分利用params和会话哈希，并在控制器中设置适当的变量。

Be careful not to put logic (even conditionals) in your views if you can find a way around it. In order to avoid this common mistake, you need to make good use of the params and session hashes and set appropriate variables in controllers

# In your view
%th{:class => @title_header}= link_to 'Title', my_path(:sort => 'title'), :id => 'title_header'

# In your controller
sort = params[:sort] || session[:sort]
if sort == 'title'
  ordering = {:order => :title}
end

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