如何將對象從控制器返回到rails中的ajax

Question

我在ROR中創建儀表板。我有一個組合框，onchange將ajax發送到儀表板以相應地獲取數據。基於我選擇的價值，我將獲得數據，並且我將相應地在高圖中呈現這些值。

hbar.html.erb 

    <select name="hBarParam" id="hBarParam" class="hBarParam"> 
     <option value="Nothing"></option> 
     <option value="Today" class="selected">Today</option> 
     <option value="Weekly">Weekly</option> 
     <option value="Monthly">Monthly</option> 
    </select> 

    <div id="postsHBar" style="width:100%; height:500px" class="postsHBar"></div> 
    $(".hBarParam").change(function(){ 

      var str = $("#hBarParam option:selected").text(); 

      $.get("/dashboard/hbar?hBarParam="+str,function(data){ 

       alert(<%= @postsHBarClean.map{|p|p[1] } %>) 

      }).done(function() { 
       alert(<%= @postsHBarClean.map{|p|p[1] } %>) 
       //render new highcharts with different like postsHBarClean,  postsHBarSalvage,etc 

    $(function() { 
    new Highcharts.Chart({ 
      chart: { 
       type: 'bar', 
       renderTo: 'postsHBar', 
       backgroundColor:null 

      }, 
      title: { 
       text:... 
      }, 
      xAxis: { 
       categories: <%= raw @postsHBar.map{|p| p.make_vehicle}.map(&:to_s) %>, 

      }, 
      yAxis: { 
       min: 0, 
       title: { 
        text: 'Count (Thousands)', 
        align: 'high' 
       }... 
      legend: { 
       layout: 'vertical', 
       align: 'right', 
       verticalAlign: 'top', 
       x: -40, 
      .... 
      }, 
      credits: { 
       enabled: false 
      }, 
     series: [{ 
      name: "Clean", 
      data: <%= @postsHBarClean.map{|p|p[1] } %> 

     }, 
     { 
      name: "Salvage", 
      data: <%= @postsHBarSalvage.map{|p|p[1] } %> 

     }.....] 
     }); 
    });  
      }); 
      }); 

控制器代碼

class DashboardController < ApplicationController 
     respond_to :html, :js, :json 
     # GET /dashboard/hbar 
     def hbar 
     puts params["hBarParam"] 
     if params["hBarParam"] == "Today" 
      postsHBarParam = "created_day = 26" 

     elsif params["hBarParam"] == "Monthly" 
      postsHBarParam = "created_month = 'April'" 
     else 
     postsHBarParam = "created_day between 22 and 27" 
     end 
     puts postsHBarParam 
    # postsHBarParam = "created_day = 26" 


     @postsHBarClean = Post.where(postsHBarParam + " and title_status like ? and make_vehicle is not null", "clean").group(:make_vehicle).count.to_a 
     @postsHBarSalvage = Post.where(postsHBarParam +" and title_status like ? and make_vehicle is not null", "salvage").group(:make_vehicle).count.to_a 
     @postsHBarPartsOnly = Post.where(postsHBarParam +" and title_status like ? and make_vehicle is not null", "parts only").group(:make_vehicle).count.to_a 
     @postsHBarRebuilt = Post.where(postsHBarParam +" and title_status like ? and make_vehicle is not null", "rebuilt").group(:make_vehicle).count.to_a 
     @postsHBarLien = Post.where(postsHBarParam +" and title_status like ? and make_vehicle is not null", "lien").group(:make_vehicle).count.to_a 
     @postsHBar = Post.select(:make_vehicle).where(postsHBarParam +" and title_status is not null and make_vehicle is not null").uniq 
     puts @postsHBarClean 

    respond_to do |format| 
    format.js 
     format.html 
     end 
end 

的問題是，圖表呈現..但使用默認值（即控制其他部分），所以每當我改變選擇選項...「把字符串」作品但圖表採用相同的值，即頁面加載期間的值。 沒有語法錯誤或括號丟失：P

我在這個問題上陷入困境，不知道如何解決它。 :(

Answer 1

如果您正在使用AJAX調用，你應該回答，因爲JS

如果我的理解沒錯，你的控制器應送東西回AJAX調用所以，你的控制器應呈現一個JSON喜歡的東西。：

class DashboardController < ApplicationController 
    ... 
    respond_to do |format| 
    format.js { render: postsHBarClean.to_json } 
    format.html 
    end 
end 

而JavaScript，你應該用JSON響應處理

花時間閱讀指南：http://guides.rubyonrails.org/working_with_javascript_in_rails.html 而且看這個RailsCast：http://railscasts.com/episodes/136-jquery-ajax-revised