Question

好的，在我修复this issue后，现在我有了这个新的，我似乎无法理解。

这是我的观点和Javascript代码：

<script language="javascript" type="text/javascript">

function getConfig(){
$.ajax({
    url: "<%= get_config_projects_url %>",
    data: {
        id: <%= @project.id %>,
        unit_mgt_address: $('.unit_mgt_address_class').val(),
    }
});
}

</script>

<%= form_for(@project) do |f| %>
  <input type=button onClick="getConfig()"/>
  <div class="field">
    <%= f.label :Unit Management Address %><br>
    <%= f.text_field :UnitMgtAddress, :class=>'unit_mgt_address_class' %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

我的控制器

class ProjectsController < ApplicationController
  before_action :set_project, only: [:show, :edit, :update, :destroy]

  <many other methods go here>

  # GET /projects/1
  # GET /projects/1.json
  def get_config

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

    respond_to do |format|
      if @project.update(project_params)
        format.js
        format.html { render action: "edit", notice: 'Project Get_Config Successful!' }
      else
        format.html { render action: "update" }
        format.json { render json: @project.errors, status: :unprocessable_entity }
      end
    end
  end

  private

  # Use callbacks to share common setup or constraints between actions.
  def set_project
    @project = Project.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def project_params
    params.require(:project).permit(:UnitMgtAddress)
  end
end

当我点击“刷新”按钮时，收到以下错误消息：

Started GET "/projects/get_config?id=9&unit_mgt_address=5.5.5.5" for 127.0.0.1 at 2014-04-29 22:48:37 -0700
Processing by ProjectsController#get_config as */*
  Parameters: {"id"=>"9", "unit_mgt_address"=>"5.5.5.5"}
  Project Load (1.0ms)  SELECT  "projects".* FROM "projects"  WHERE "projects"."id"= ? LIMIT 1  [["id", 9]]
Completed 400 Bad Request in 6ms

ActionController::ParameterMissing (param is missing or the value is empty: project):
  app/controllers/projects_controller.rb:128:in `project_params'
  app/controllers/projects_controller.rb:91:in `block in get_config'
  app/controllers/projects_controller.rb:89:in `get_config'


  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/_source.erb (2.0ms)
  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (1.0ms)
  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (1.0ms)
  Rendered C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb (63.0ms)

我尝试了很多方法通过Javascript将“：project”参数传递给控制器，但我没有运气。

感谢任何帮助？

谢谢＆amp;最诚挚的问候

更新1 根据要求，这些是我为get_config和set_config方法添加的路由

resources :projects do
  collection do
    get :get_config
    get :set_config
  end
end

工作解决方案1 

这是对我有用的代码更改：我在表单外移动了按钮并将其替换为以下

<%= button_to 'Get Config', get_config_projects_url(id: @project.id, project: { unit_mgt_address: @project.UnitMgtAddress }), remote: true, method: :get %>

工作解决方案2（解决方法）

function getConfig(){
    $.ajax({
        url: "<%= get_config_projects_url(project: { id: @project.id, unit_mgt_address: @project.UnitMgtAddress }) %>",
        data: {
            id: <%= @attero.id %>,
            unit_mgt_address: $('.unit_mgt_address_class').val(),
        }

    });
}

Answer 1

对于那些多年后观看的人。我认为您需要在您的数据下放置一个“项目”对象参数，以包含您想要的参数。对于其他任何人来说，它是对象名称（：page，：person etc）

Rails期望在其控制器中实现这一点。

如此;

data: {
  project: {
    id: <%= @attero.id %>,
    unit_mgt_address: $('.unit_mgt_address_class').val()
  }    
}

Answer 2

这会有用吗？

data: {
    "id": <%= @project.id %>,
    "project[UnitMgtAddress]": $('.unit_mgt_address_class').val(),
}

Answer 3

你应该让Rails为你处理你的AJAX请求。我在提交的表单之外拉了那个按钮并将其放入自己的link_to或button_to，如果你想使用一个method: :get，只需添加remote: true按钮。设置<%= link_to 'Get Config', get_config_projects_url(@project.id, project: { unit_mgt_address: @project.UnitMgtAddress }), remote: true %>，它将为您处理所有AJAX工作。

<%= button_to 'Get Config', get_config_projects_url(@project.id, project: { unit_mgt_address: @project.UnitMgtAddress }), remote: true, method: :get %>

或

button_to

语法可能需要稍微调整一下，特别是对于你的路径，但是让Rails管理这类事情要比你尝试做的更清晰。阅读{{1}} here的语法。

Ajax请求导致＆＃34; param丢失或值为空＆＃34;错误

3 个答案: