Rails AJAX - 获取下拉菜单来填充表格 [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在同一页面中使用AJAX来填充表格，以便更改显示，而不刷新页面。我已经制定了远程调用的代码，并将自定义操作添加到控制器，但是我不知道如何将返回的信息存入表中。目前，表格正在循环遍历所有项目，但我希望它仅显示所选择的一个项目的信息。

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.

我需要什么写一个JS（rjs？）文件来获取它来处理返回的信息，以及需要对现有表进行什么更改以确保显示正确的信息？

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'}) %>

控制器操作：

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

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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