Javascript Rails中的Ajax POST请求错误

我第一次尝试在simple Rails应用程序中实现Ajax，主要得益于本教程：

我的应用程序有一个特定的显示视图，我想在其中显示一个排行榜，其中显示一个用户列表及其记录，以及一个可以创建新用户/记录的表单

我希望通过Ajax实现这一点，但每次尝试提交Ajax请求时，我都会收到一个500错误，指向下面的JQuery行并抛出一条“加载资源失败”消息

xhr.send( ( options.hasContent && options.data ) || null );  

我尝试过一些改变，但没有成功，包括在表单中使用remote:true和直接使用JQuery发出Ajax请求。你能给我指出这里潜在的问题吗？以下为相关代码：

排行榜\u控制器显示操作呈现相关排行榜

  def show
   @leaderboard = Leaderboard.find(params[:id])
   @leaders = @leaderboard.leaders
   @leader = Leader.new(persisted_time: @persisted_time)
  end

排行榜/show.html.erb

  <%= simple_form_for([@leaderboard, @leader], html: { class: 'form-inline', id:'leader-form' }) do |f| %>
    <%= f.error_notification %>
    <div class="form-inputs">
      <%= f.input :name, :label => false, :placeholder => "Your name here", :required => true, :autofocus => true %>
      <%= f.input :record_time, :label => "Your record", input_html: {readonly: ''} %>
      <%= f.button :submit %>
    </div>
  <% end %>

  <ul>
  <% @leaders.each do |leader| %>
    <li>
      <%= leader.name %> |
      <strong>record: </strong><%= leader.record_time %> <br />
    </li>
  <% end %>
  </ul>

<%= simple_form_for([@leaderboard, @leader],remote: true, html: { class: 'form-inline', id:'leader-form' }) do |f| %>
    <%= f.error_notification %>
    <div class="form-inputs">
      <%= f.input :name, :label => false, :placeholder => "Your name here", :required => true, :autofocus => true %>
      <%= f.input :record_time, :label => "Your record", input_html: {readonly: ''} %>
      <%= f.button :submit %>
    </div>
  <% end %>

  <ul>
  <% @leaders.each do |leader| %>
    <li>
      <%= leader.name %> |
      <strong>record: </strong><%= leader.record_time %> <br />
    </li>
  <% end %>
  </ul>

和路线

  resources :leaderboards, shallow: true do
   resources :leaders
  end

$(function(){    
return $("#your-form-id").on("ajax:success", function(e, data, status, xhr) {
            e.preventDefault();
            // success code 
        }).on("ajax:error", function(e, xhr, status, error) {
            // error code
        });
});

很明显，我对Ajax没有什么了解。如果你能给我指出正确的方向，我将不胜感激

这是我提交表单后在控制台中得到的输出

jquery.self-bd7ddd3….js?body=1:10255 POST http://localhost:3000/leaderboards/1/leaders 500 (Internal Server Error)

这将导致JQuery脚本中的这一行：

xhr.send( ( options.hasContent && options.data ) || null );

并生产：

Failed to load resource: the server responded with a status of 500 (Internal Server Error)

和服务器日志

         Started POST "/leaderboards/1/leaders" for ::1 at 2016-11-28 21:42:24 +1100
Processing by LeadersController#create as JS
  Parameters: {"utf8"=>"✓", "leader"=>{"name"=>"9089sdas8dds", "persisted_time"=>"5"}, "commit"=>"S", "leaderboard_id"=>"1"}
  Leaderboard Load (0.5ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  CACHE (0.0ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
   (0.2ms)  BEGIN
  Leaderboard Load (0.4ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  SQL (2.6ms)  INSERT INTO "leaders" ("name", "persisted_time", "leaderboard_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["name", "9089sdas8dds"], ["persisted_time", "5"], ["leaderboard_id", 1], ["created_at", 2016-11-28 10:42:24 UTC], ["updated_at", 2016-11-28 10:42:24 UTC]]
   (2.2ms)  COMMIT
Completed 201 Created in 15ms (Views: 0.8ms | ActiveRecord: 5.9ms)


Started POST "/leaderboards/1/leaders" for ::1 at 2016-11-28 21:42:27 +1100
Processing by LeadersController#create as JS
  Parameters: {"utf8"=>"✓", "leader"=>{"name"=>"9089sdas8dds", "persisted_time"=>"5"}, "commit"=>"S", "leaderboard_id"=>"1"}
  Leaderboard Load (0.5ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  CACHE (0.0ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
   (0.7ms)  BEGIN
  Leaderboard Load (0.5ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  SQL (1.9ms)  INSERT INTO "leaders" ("name", "persisted_time", "leaderboard_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["name", "9089sdas8dds"], ["persisted_time", "5"], ["leaderboard_id", 1], ["created_at", 2016-11-28 10:42:27 UTC], ["updated_at", 2016-11-28 10:42:27 UTC]]
   (0.5ms)  COMMIT
Completed 201 Created in 14ms (Views: 1.0ms | ActiveRecord: 4.2ms)


Started POST "/leaderboards/1/leaders" for ::1 at 2016-11-28 21:42:29 +1100
Processing by LeadersController#create as JS
  Parameters: {"utf8"=>"✓", "leader"=>{"name"=>"9089sdas8dds", "persisted_time"=>"5"}, "commit"=>"S", "leaderboard_id"=>"1"}
  Leaderboard Load (0.6ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  CACHE (0.0ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
   (0.2ms)  BEGIN
  Leaderboard Load (0.6ms)  SELECT  "leaderboards".* FROM "leaderboards" WHERE "leaderboards"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  SQL (2.3ms)  INSERT INTO "leaders" ("name", "persisted_time", "leaderboard_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id"  [["name", "9089sdas8dds"], ["persisted_time", "5"], ["leaderboard_id", 1], ["created_at", 2016-11-28 10:42:29 UTC], ["updated_at", 2016-11-28 10:42:29 UTC]]
   (2.3ms)  COMMIT
Completed 201 Created in 14ms (Views: 0.7ms | ActiveRecord: 6.0ms)

尝试添加

respond_to(:js)

在create方法的末尾

是的，请使用

remote:true

尝试添加

respond_to(:js)

在create方法的末尾

---

是的，请使用

remote:true

请按以下方式更新您的代码

show.html.erb

  <%= simple_form_for([@leaderboard, @leader], html: { class: 'form-inline', id:'leader-form' }) do |f| %>
    <%= f.error_notification %>
    <div class="form-inputs">
      <%= f.input :name, :label => false, :placeholder => "Your name here", :required => true, :autofocus => true %>
      <%= f.input :record_time, :label => "Your record", input_html: {readonly: ''} %>
      <%= f.button :submit %>
    </div>
  <% end %>

  <ul>
  <% @leaders.each do |leader| %>
    <li>
      <%= leader.name %> |
      <strong>record: </strong><%= leader.record_time %> <br />
    </li>
  <% end %>
  </ul>

<%= simple_form_for([@leaderboard, @leader],remote: true, html: { class: 'form-inline', id:'leader-form' }) do |f| %>
    <%= f.error_notification %>
    <div class="form-inputs">
      <%= f.input :name, :label => false, :placeholder => "Your name here", :required => true, :autofocus => true %>
      <%= f.input :record_time, :label => "Your record", input_html: {readonly: ''} %>
      <%= f.button :submit %>
    </div>
  <% end %>

  <ul>
  <% @leaders.each do |leader| %>
    <li>
      <%= leader.name %> |
      <strong>record: </strong><%= leader.record_time %> <br />
    </li>
  <% end %>
  </ul>

assets/javascripts/leaders.js

  resources :leaderboards, shallow: true do
   resources :leaders
  end

$(function(){    
return $("#your-form-id").on("ajax:success", function(e, data, status, xhr) {
            e.preventDefault();
            // success code 
        }).on("ajax:error", function(e, xhr, status, error) {
            // error code
        });
});

---

请更新您的代码如下

show.html.erb

  <%= simple_form_for([@leaderboard, @leader], html: { class: 'form-inline', id:'leader-form' }) do |f| %>
    <%= f.error_notification %>
    <div class="form-inputs">
      <%= f.input :name, :label => false, :placeholder => "Your name here", :required => true, :autofocus => true %>
      <%= f.input :record_time, :label => "Your record", input_html: {readonly: ''} %>
      <%= f.button :submit %>
    </div>
  <% end %>

  <ul>
  <% @leaders.each do |leader| %>
    <li>
      <%= leader.name %> |
      <strong>record: </strong><%= leader.record_time %> <br />
    </li>
  <% end %>
  </ul>

<%= simple_form_for([@leaderboard, @leader],remote: true, html: { class: 'form-inline', id:'leader-form' }) do |f| %>
    <%= f.error_notification %>
    <div class="form-inputs">
      <%= f.input :name, :label => false, :placeholder => "Your name here", :required => true, :autofocus => true %>
      <%= f.input :record_time, :label => "Your record", input_html: {readonly: ''} %>
      <%= f.button :submit %>
    </div>
  <% end %>

  <ul>
  <% @leaders.each do |leader| %>
    <li>
      <%= leader.name %> |
      <strong>record: </strong><%= leader.record_time %> <br />
    </li>
  <% end %>
  </ul>

assets/javascripts/leaders.js

  resources :leaderboards, shallow: true do
   resources :leaders
  end

$(function(){    
return $("#your-form-id").on("ajax:success", function(e, data, status, xhr) {
            e.preventDefault();
            // success code 
        }).on("ajax:error", function(e, xhr, status, error) {
            // error code
        });
});

---

---

感谢Fallenhero，不幸的是更改create方法并没有帮助。似乎请求甚至没有达到方法。如前所述，我还尝试在表单中包含remote:true，但问题仍然存在。然后请说明您收到的错误消息。我收到的错误与我问题中发布的错误相同。我将更新问题，以包括控制台中的输出，以获取有关错误的更多信息。我知道我将在上面发布它们。如果控制器中有错误，请发布完整的代码谢谢Fallenhero，很遗憾，更改create方法没有帮助。似乎请求甚至没有达到方法。如前所述，我还尝试在表单中包含remote:true，但问题仍然存在。然后请说明您收到的错误消息。我收到的错误与我问题中发布的错误相同。我将更新问题，以包括控制台中的输出，以获取有关错误的更多信息。我知道我将在上面发布它们。如果控制器中有错误，请发布完整的代码谢谢Hardik。我尝试了你的建议，但不幸的是，当我点击submit按钮时，又出现了同样的错误（如上所述）。还有其他线索吗？我能看看你的回溯吗？对不起，哈迪克，我只是个编程新手。我不知道如何与你分享。如果你能指导我，我很乐意。我不知道在哪里可以找到更多的信息。您能给我指一下正确的方向吗？在您的终端上，rails服务器运行的同一选项卡上，谢谢Hardik。我尝试了你的建议，但不幸的是，当我点击submit按钮时，又出现了同样的错误（如上所述）。还有其他线索吗？我能看看你的回溯吗？对不起，哈迪克，我只是个编程新手。我不知道如何与你分享。如果你能指导我，我很乐意。我不知道在哪里可以找到更多的信息。您能告诉我正确的方向吗？在您的终端上，rails服务器运行的同一选项卡上