如何使用变量控制表单提交远程? [英] How can I control form submit remote with variable?

问题描述

我想控制何时刷新页面(respond_to format.html)和何时切换按钮(respond_to format.js)，通过将局部变量传递给用于远程的部分:true(remote:remote_flag)，但该变量remote_flag总是假的.

I want to control when to refresh page (respond_to format.html) and when to toggle buttons (respond_to format.js), by passing local variable to partial used for remote: true (remote: remote_flag), but that variable remote_flag is always false.

------------父部分----------------

------------- parent partial ----------------

<% if current_user.following?(user_event) %>
  <%= render partial: 'shared/remove_favorite', 
    locals: { user_event: user_event, remote_flag: true } %>
<% else %>
  <%= render partial: 'shared/add_favorite', 
    locals: { user_event: user_event, remote_flag: true } %>
<% end %>

------------- 添加喜欢的部分----------------

------------- add favorite partial ----------------

<%= form_for(current_user.favorites.build(followed_event_id: user_event.id), 
  html: { id: "event_number_#{user_event.id}" }, remote: remote_flag) do |f| %>
  <div class="hidden"><%= f.hidden_field :followed_event_id %></div>
  <%= f.submit "Add to favorites %>
<% end %>

------------- 删除喜欢的部分----------------

------------- remove favorite partial ----------------

<%= form_for(current_user.favorites.find_by_followed_event_id(user_event),
  html: { id: "event_number_#{user_event.id}", method: :delete }, remote: remote_flag) do |f| %>
  <%= f.submit "Remove from favorites %>
<% end %>

推荐答案

@remote_flag 是一个实例变量，不是局部变量，所以它不会传递给带有 locals 的局部变量: { user_event: user_event, remote_flag: false } 构造.由于它未设置，因此(默认情况下)为 nil 并且它在条件语句中的行为类似于 false.相反，您应该使用传递的局部变量 remote_flag:

@remote_flag is an instance variable, not the local variable, so it isn't passed to the partial with locals: { user_event: user_event, remote_flag: false } construction. Since it isn't set, it is (by default) nil and it behaves like false in conditional statements. Instead, you should rather use your passed local variable, remote_flag:

<%= form_for(current_user.favorites.find_by_followed_event_id(user_event),
  html: { id: "event_number_#{user_event.id}", method: :delete }, remote: remote_flag) do |f| %>
  <%= f.submit "Remove from favorites %>
<% end %>

并通过 locals: {...} 构造或在控制器中显式设置实例变量传递变量:

and pass variable through locals: {...} construction or set an instance variable explicitly in controller:

@remote_flag = !!condition

这篇关于如何使用变量控制表单提交远程?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！