预装表格数据 [英] Preloading form data

问题描述

我正在使用Railscasts第197集中介绍的Ryan Bates技术，以便随着用户向表单中添加更多项目，表单可以增长".一切都很好，但是我需要在提供初始项目作为URL的一部分的同时调用页面.

I'm using the technique Ryan Bates illustrated in Railscasts Episode 197 so that the form can "grow" as the user adds more items to the form. That's all working great, but I need to call the page while supplying an initial item as a part of the URL.

由于Ryan的技术是让用户单击添加"按钮以调用jQuery函数以将字段添加到表单中，因此，我有点阻碍了如何将信息从控制器传递到jQuery进行调用和预填充-这些新字段.

Since Ryan's technique has the user click an Add button to invoke a jQuery function to add fields to the form, I'm a little stymied how to pass information from the controller to jQuery to invoke -- and prefill -- one of those new fields.

我在想这个错误吗?

推荐答案

是的，您正在考虑的是错误的;-)

Yes, you're thinking about it wrong ;-)

以这种形式为例:

<% form_for @survey do |f| %>  
  <%= f.error_messages %>  
  <p>  
    <%= f.label :name %><br />  
    <%= f.text_field :name %>  
  </p>  
  <% f.fields_for :questions do |builder| %>  
    <%= render 'question_fields', :f => builder %>  
  <% end %>  
  <p><%= link_to_add_fields "Add Question", f, :questions %>  
  <p><%= f.submit "Submit" %></p>  
<% end %>

fields_for是一个迭代器；所以您的控制器要做的就是:

fields_for is an iterator; so all your controller has to do is:

@survey.questions.build(:content => "Prepared question")

，它将显示在页面上.

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