javascript - Rails 3.2 .js.erb 呈现但从不触发

Question

我遇到了一个非常令人困惑的问题。我以前做过，但无法弄清楚为什么它在这种情况下不起作用，如果有人知道从哪里开始寻找，我将不胜感激。

# app/views/petitions/new
<%= form_for @petition, :remote => true do |form| %>
  <%= form.submit "Submit", :class => "primary" %>
<% end %>


# app/controllers/petitions_controller       
def create
  # I've stripped everything out of here to isolate the issue
end

# app/views/petitions/create.js.erb
alert("Hello World");

# log
Started POST "/petitions" for 127.0.0.1 at 2012-02-02 23:07:43 -0500
Processing by PetitionsController#create as JS
Parameters: {"utf8"=>"✓", "authenticity_token"=>"bWXmagSz0hVqhQ1/1U480kQUYcIhmSEbNMAofWYT2Oc=", "petition"=>{"name"=>"", "email"=>"", "location"=>""}, "commit"=>"Submit"}
  Rendered petitions/create.js.erb (0.0ms)
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
  SQL (0.6ms)  UPDATE `users` SET `last_activity_at` = '2012-02-03 04:07:43' WHERE `users`.`id` = 1
Completed 200 OK in 5ms (Views: 2.5ms | ActiveRecord: 0.9ms)

“alert()”永远不会触发，我放入 .js.erb View 中的任何其他内容也不会触发，即使日志显示 Rendered petitions/create.js.erb ( 0.0 毫秒)。我以前在其他(非 3.2)项目中这样做过，所以我确信我正在做一些非常愚蠢的事情或者这里发生了一些非常偷偷摸摸的事情。

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更新 - Firebug 似乎在告诉我，我收到的内容类型是“text/html”而不是“text/javascript”。我仍然不确定为什么会发生这种情况或从哪里开始寻找原因，如有任何提示，我们将不胜感激。

Answer 1

您的 PetitionsController 顶部应该有以下行:

respond_to :js, :only => :create