Javascript 轨道5和x2B；JQuery进度条不工作

实现JQuery进度条，以便在向下滚动时 它应该在顶部显示一个绿色条。当我开始滚动时，进度条不会出现。我检查了条上的元素它显示宽度%向上看屏幕截图

scroll.js

$(document).on('scroll', function() {

  var pixelsFromTop = $(document).scrollTop()

  var documentHeight = $(document).height()
  var windowHeight = $(window).height()

  var difference = documentHeight - windowHeight

  var percentage = 100 * pixelsFromTop / difference

  $('.bar').css('width', percentage + '%')

})

show.html.erb

<div class="progress">
   <div class="bar"></div>
</div>

<section class="day">

    <h2><%= "To make #{number_to_currency @product.revenue}" %></h2>
    <p class="lead"><%= "You need to make #{number_to_currency @product.monthly_amount} a month" %><br/>
    <%= "You need to make #{number_to_currency @product.daily_amount} a day" %></p>
</section>


<section class="people"> 

    <h2>Or if you create and sell a product</h2>
        <table>
        <p class="lead"><%= "To make #{@product.revenue } 10,000 people to buy a
        #{number_to_currency @product.create_and_sell_product_10000} product" %><br/>

        <%= "To make #{@product.revenue } 5,000 people to buy a
        #{number_to_currency @product.create_and_sell_product_5000} product" %><br/>

        <%= "To make #{@product.revenue } 2,000 people to buy a
        #{number_to_currency @product.create_and_sell_product_2000} product" %><br/>

        <%= "To make #{@product.revenue } 1,000 people to buy a
     #{number_to_currency @product.create_and_sell_product_1000} product" %><br/>

        <%= "To make #{@product.revenue } 100 people to buy a
     #{number_to_currency @product.create_and_sell_product_100} product" %></p>
        </table>
</section>

产品控制器.rb

  def set_product
      @product = Product.find(params[:id])
    end

我的路线上有这个

Rails.application.routes.draw do
  resources :products

  root 'products#new'
end


Started POST "/products" for 127.0.0.1 at 2017-08-16 17:03:11 +0100
Processing by ProductsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ZU4tSNn0PsbSL2CTB45yIuBlrn5OePTYPSbIcdKThzJuu/k7GsiIhFf7JJ98pC5NmhGVg5QyekokpzR1s4tv4A==", "product"=>{"revenue"=>"2000", "months"=>"2"}, "commit"=>"Show Me How Much to Charge!"}
   (0.9ms)  BEGIN
  SQL (3.5ms)  INSERT INTO "products" ("revenue", "months", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id"  [["revenue", "2000.0"], ["months", 2], ["created_at", "2017-08-16 16:03:11.679460"], ["updated_at", "2017-08-16 16:03:11.679460"]]
   (46.6ms)  COMMIT
Redirected to http://localhost:3000/products/82
Completed 302 Found in 57ms (ActiveRecord: 51.0ms)


Started GET "/products/82" for 127.0.0.1 at 2017-08-16 17:03:11 +0100
Processing by ProductsController#show as HTML
  Parameters: {"id"=>"82"}
  Product Load (0.3ms)  SELECT  "products".* FROM "products" WHERE "products"."id" = $1 LIMIT $2  [["id", 82], ["LIMIT", 1]]
  Rendering products/show.html.erb within layouts/application
  Rendered products/show.html.erb within layouts/application (7.2ms)
Completed 200 OK in 398ms (Views: 395.0ms | ActiveRecord: 0.3ms)


Started GET "/products/scroll.js" for 127.0.0.1 at 2017-08-16 17:03:12 +0100
Processing by ProductsController#show as JS
  Parameters: {"id"=>"scroll"}
  Product Load (0.3ms)  SELECT  "products".* FROM "products" WHERE "products"."id" = $1 LIMIT $2  [["id", 0], ["LIMIT", 1]]
Completed 404 Not Found in 1ms (ActiveRecord: 0.3ms)



ActiveRecord::RecordNotFound (Couldn't find Product with 'id'=scroll):

app/controllers/products_controller.rb:67:in `set_product'

此错误

ActiveRecord:：RecordNotFound（找不到id为scroll的产品）

由不正确的资产路径触发。当您查看

app/layouts/application.html.erb

时，您将看到

<script src="scroll.js"></script>

或

只需从

application.js

调用它，如下所示

//= require scroll

产生

<script src="/assets/scroll.js?body=1"></script>

---

我建议您阅读一下，以便更好地理解。

是什么触发了此请求

Started GET”/products/scroll.js“

？它与resourceful show route冲突，因为Rails需要url中的

：id

，所以它将

scroll

视为

id

，这导致了该错误。在我的routes中，我有资源：产品没问题，但我想知道是什么触发了该请求

启动了“/products/scroll.js”

？我转到根目录“products#new”将信息添加到products/_form.html.erb。点击提交。它会转到显示页面-。添加了heroku日志，其中显示了触发的请求添加了代码&只有在progressdiv类中添加一些文本时，它才能工作。如果我没有添加任何文本，它不会显示进度条。但是谢谢&我会再次查看资产管道！

//= require scroll

<script src="/assets/scroll.js?body=1"></script>