我试图让选择从下拉列表填充表在同一个页面，使用AJAX，这样的变化似乎不需要刷新页面。我得尽可能制定出了code远程调用，并添加自定义操作的控制器，但我不知道如何去得到返回的信息转换成我已经得到了表。目前，该表是刚刚经历的所有项目循环，但我希望它只是显示所选的一个项目的信息。

我会怎么需要在JS写（RJS？）文件得到它处理返回的信息，而我需要什么样的变化，使现有的表，以确保它显示了正确的信息？

谢谢！

下拉（与AJAX调用）：

 ＆LT;％= collection_select：身份证，Project.all，：ID，：姓名，：的onchange =＆GT; remote_function（：URL =＆GT; {：动作=＆GT;populate_projects'}）％＆GT;
 

控制器操作：

 高清populate_projects
    @project = Project.find（PARAMS [：ID]）
 结束
 

和现有的表：

 ＆LT;表＆gt;
  ＆其中; TR＆GT;
    百分位＆GT;名称＆LT; /第i个
    百分位＆GT;分类和LT; /第i个
    百分位＆GT;预算与LT; /第i个
    百分位＆GT;截止日期：LT; /第i个
    百分位＆GT;公司ID＆LT; /第i个
    百分位＆GT;＆LT; /第i个
    百分位＆GT;＆LT; /第i个
    百分位＆GT;＆LT; /第i个
  ＆LT; / TR＆GT;

＆LT;％@ projects.each办|专题| ％＆GT;
  ＆其中; TR＆GT;
    ＆其中; TD＆GT;＆其中;％= project.name％GT;＆所述; / TD＆GT;
    ＆其中; TD＆GT;＆其中;％= project.category％GT;＆所述; / TD＆GT;
    ＆LT; TD＆GT;＆LT;％= number_to_currency（project.budget，：单位=＆gt;中和放大器;英镑;）％＆GT;＆LT; / TD＆GT;
    ＆LT; TD＆GT;＆LT;％= project.deadline.strftime（％A，％D％A％Y）％＆GT;＆LT; / TD＆GT;
    ＆其中; TD＆GT;＆其中;％= project.company_id％GT;＆所述; / TD＆GT;
    ＆LT; TD＆GT;＆LT;％=的link_to更多，项目％GT;＆LT; / TD＆GT;
    ＆LT; TD＆GT;＆LT;％=的link_to'编辑'，edit_project_path（项目）％GT;＆LT; / TD＆GT;
    ＆LT; TD＆GT;＆LT;％=的link_to删除，项目，确认：你确定吗？，方法：删除％＆GT;＆LT; / TD＆GT;
  ＆LT; / TR＆GT;
＆LT;％结束％GT;
＆LT; /表＆gt;
 

解决方案

假设你正在使用jQuery

 ＆LT;％= collection_select：项目：身份证，Project.all，：ID，：姓名，{}，{：的onchange =＆GT; '$获得（/ populate_projects）'}％GT;
 

然后在你的控制器

 高清populate_projects
  @project = Project.find（PARAMS [：ID]）
  respond_to代码做|格式|
    ...
    format.js {渲染populate_projects'，：格式=＆GT; [：JS]}
    ...
  结束
结束
 

最后，创建 populate_projects.js.erb ，写的任何变化表的内容脚本。 @project 是该脚本可用。

I'm trying to get a selection from a dropdown to populate a table in the same page, using AJAX so that changes appear without a page refresh. I've got as far as working out the code for the remote call, and adding the custom action to the controller, but I don't know how to get the returned information into the table I've got. At the moment, the table is just looping through all the projects, but I want it to only display the info for the one project that is selected.

What would I need to write in a JS (rjs?) file to get it to process the returned information, and what changes would I need to make to the existing table to make sure that it is displaying the correct info?

Thanks!

Dropdown (with AJAX call):

<%= collection_select :id, Project.all, :id, :name, :onchange => remote_function(:url=>{:action => 'populate_projects'}) %>

Controller action:

 def populate_projects
    @project = Project.find(params[:id])
 end

And the existing table:

<table>
  <tr>
    <th>Name</th>
    <th>Category</th>
    <th>Budget</th>
    <th>Deadline</th>
    <th>Company ID</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>

<% @projects.each do |project| %>
  <tr>
    <td><%= project.name %></td>
    <td><%= project.category %></td>
    <td><%= number_to_currency(project.budget, :unit => "&pound;") %></td>
    <td><%= project.deadline.strftime("%A, %d %B %Y") %></td>
    <td><%= project.company_id %></td>
    <td><%= link_to 'More', project %></td>
    <td><%= link_to 'Edit', edit_project_path(project) %></td>
    <td><%= link_to 'Delete', project, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>
</table>

Assume you're using jquery

<%= collection_select :project, :id, Project.all, :id, :name, {}, {:onchange => '$.get("/populate_projects")'} %>

then in your controller

def populate_projects
  @project = Project.find(params[:id])
  respond_to do |format|
    ...
    format.js { render 'populate_projects', :formats => [:js] }
    ...
  end
end

finally, create populate_projects.js.erb and write any change table content script. @project is available in that script.