Ruby on rails Rails-如何在部分数据库中访问索引值

我试图在用户填写表单后使用内置的rails ajax将一个项目附加到列表中-但是，我无法将新条目附加到div标记：ActionView:：Template:：Error undefined局部变量或方法“index”

客户/索引：

<% @clients.each_with_index do |client, index| %> 
  <div id="communication_pane<%= index %>">
    <%= render client.communications.order(created_at: :desc) %>
  </div>

  <%= form_for([@clientlist, client, client.communications.build], remote: true) do |f| %>
  <%= f.text_area :content, class: "form-control", id: "communication_content#{index}" %>
  <%= f.submit("New Communication") %>
<% end %>

通信/create.js.erb：

$('#communication_pane<%= index %>').prepend('<%= escape_javascript(render @communications) %>');

---

如何从客户机/索引中访问索引值？

我认为您必须将索引变量作为隐藏字段传递给控制器操作，然后将其显示在create.js.erb上

客户/索引：

通信/create.js.erb

在create.js.erb中，$'communication_pane'处有一个未定义的变量索引 因为服务器无法知道您在客户端上单击的位置，所以您必须明确地告诉服务器。这里有一个想法：

<!-- app/views/clients/index.html.erb -->
<% @clients.each_with_index do |client, index| %> 
  <div id="communication_pane<%= index %>">
    <%= render client.communications.order(created_at: :desc) %>
  </div>

  <%= form_for([@clientlist, client, client.communications.build], remote: true) do |f| %>
    <%= f.text_area :content, class: "form-control", id: "communication_content#{index}" %>
    <!-- Letting server know the index of current form by adding a param -->
    <%= hidden_field_tag :client_index, index %>
    <%= f.submit("New Communication") %>
  <% end %>
<% end %>

希望这有帮助

def create
  @index = params[:communication][:index]
  ...
end

$('#communication_pane<%= @index %>').prepend('<%= escape_javascript(render @communications) %>');

<!-- app/views/clients/index.html.erb -->
<% @clients.each_with_index do |client, index| %> 
  <div id="communication_pane<%= index %>">
    <%= render client.communications.order(created_at: :desc) %>
  </div>

  <%= form_for([@clientlist, client, client.communications.build], remote: true) do |f| %>
    <%= f.text_area :content, class: "form-control", id: "communication_content#{index}" %>
    <!-- Letting server know the index of current form by adding a param -->
    <%= hidden_field_tag :client_index, index %>
    <%= f.submit("New Communication") %>
  <% end %>
<% end %>

# app/views/communications/create.js.erb
$('#communication_pane<%= params[:client_index] %>')
  .prepend('<%= escape_javascript(render @communications) %>');