Rails 4:切换 link_to 与 Ajax 和 jQuery(嵌套资源)

Rails 4: Toggle link_to with Ajax and jQuery (nested resources)

我在 'ideas' 上有 'complete' 和 'incomplete' 链接。我想在不重新加载页面的情况下切换它们。

这是我当前的代码:

_idea.html.erb 部分:

<li id="<%= dom_id(idea) %>">
    <%= idea.description %>
    <% if idea.completed? %>
           <%= link_to "Incomplete", complete_project_idea_path(idea.project, idea), method: :patch, remote: true %>
      <% else %>
           <%= link_to "Complete", complete_project_idea_path(idea.project, idea), method: :patch, remote: true %>
      <% end %>
 </li>  

这是我的控制器操作(我使用的是嵌套资源):

def complete
  @project = Project.find(params[:project_id])
  @idea = @project.ideas.find(params[:id])
    respond_to do |format|
     @idea.toggle_completion!
         format.html {redirect_to root_path}
         format.js { }
    end
end

并且在 idea.rb 模型中:

def completed?
   !completed_at.blank?
end

def toggle_completion!
    if completed?
         update_attribute(:completed_at, nil)
    else
         update_attribute(:completed_at, Time.now)
    end
end

Complete.js.erb 文件;

$('#<%= dom_id(@idea)%>').html("What here? How can I toggle between the complete and incomplete links?");

我也尝试将 link_to 放入新的偏音中,但这变得太复杂了(因为它们是子偏音)并且也没有用。

我应该在 complete.js.erb 文件中尝试什么?

编辑:谢谢@Fer!我做了以下更改,但它还没有完全起作用。

我将 complete.js.erb 更改为:

$("#toggle_completion_link").text("<%= @idea.completed? ? 'Incomplete' : 'Complete' %>")

我将想法更改为@idea,因为没有它我得到了'undefined local variable or method `idea''错误。

同样在_idea.html.erb部分,在projects/idea.html.erb下,我改为:

 <%= link_to (idea.completed? ? 'Incomplete' : 'Complete'), complete_project_idea_path(idea.project, idea), method: :patch, remote: true, id: 'toggle_completion_link' %>

但它还没有正常工作,尽管我确实收到了 'completed 200 ok' 消息。

Started PATCH "/projects/1/ideas/4/complete" for ...
Processing by IdeasController#complete as JS
Parameters: {"project_id"=>"1", "id"=>"4"}
User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" =   ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
Project Load (0.2ms)  SELECT  "projects".* FROM "projects" WHERE "projects"."id" =  LIMIT 1  [["id", 1]]
Idea Load (0.2ms)  SELECT  "ideas".* FROM "ideas" WHERE "ideas"."project_id" =  AND "ideas"."id" =   ORDER BY priority ASC  LIMIT 1  [["project_id", 1], ["id", 4]]
Rendered ideas/complete.js.erb (0.5ms)
Completed 200 OK in 9ms (Views: 3.3ms | ActiveRecord: 1.8ms)

好吧,在您的情况下,您只需要更改 link 文本,因为两个 link 都指向相同的 url 和方法。

我会像在 _idea.html.erb

中那样干掉它
<li id="<%= dom_id(idea) %>">
    <%= idea.description %>
    <%= link_to (idea.completed? ? 'Incomplete' : 'Complete'), complete_project_idea_path(idea.project, idea), method: :patch, remote: true, id: 'toggle_completion_link' %>
 </li>

注意最后 link 的 id 属性。

如果您要显示多个项目并且您有 ID 问题,我会使用 dom_id(idea) 作为 link(或类似 dom_id(idea) + '_link' 的变体)的 ID,而不是包含它的 li

然后,作为您 ajax 请求的答复,在您的 complete.js.erb 文件中:

$("#toggle_completion_link").text("<%= idea.completed? ? 'Incomplete' : 'Complete' %>")

你也可以替换整个东西,但我不明白这里的意义,因为你只需要切换 link 文本。无论如何,对于教学,您可以像下面这样渲染整个部分:

$("#<%= dom_id(idea) %>").replace("<%= escape_javascript(render 'idea', object: @idea %>")

您可能需要调整部分路径,因为您没有说明它位于何处