Rails AJAX - 获取下拉选择以填充表格 [英] Rails AJAX - getting a dropdown selection to populate a table

问题描述

我正在尝试从下拉列表中选择一个选项来填充同一页面中的表格，使用 AJAX 以便在不刷新页面的情况下显示更改.我已经为远程调用制定了代码，并将自定义操作添加到控制器，但我不知道如何将返回的信息放入我得到的表中.目前，该表只是遍历所有项目，但我希望它只显示所选项目的信息.

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.

我需要在 JS (rjs?) 文件中写入什么才能让它处理返回的信息，以及我需要对现有表进行哪些更改以确保它显示正确的信息?

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?

下拉(使用 AJAX 调用):

Dropdown (with AJAX call):

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

控制器动作:

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

和现有表:

<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>

推荐答案

假设你正在使用 jquery

Assume you're using jquery

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

然后在您的控制器中

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

最后，创建 populate_projects.js.erb 并编写任何更改表内容脚本.@project 在该脚本中可用.

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

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