TypeError：App.cable未定義

我在我的機器上運行ActionCable時遇到問題。TypeError：App.cable未定義

在資產/ Java腳本/渠道我有兩個文件：

index.coffee

#= require action_cable 
#= require_self 
#= require_tree . 

@App = {} 
App.cable = ActionCable.createConsumer()

和question.coffee

App.question = App.cable.subscriptions.create "QuestionChannel", 
    connected: -> 
    # Called when the subscription is ready for use on the server 

    disconnected: -> 
    # Called when the subscription has been terminated by the server 

    received: (data) -> 
    # Called when there's incoming data on the websocket for this channel 

    follow: -> 
    @perform 'follow' 

    unfollow: -> 
    @perform 'unfollow'

我的application.js文件看起來像這樣：

// This is a manifest file that'll be compiled into application.js, which will include all the files 
// listed below. 
// 
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts, 
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path. 
// 
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the 
// compiled file. 
// 
// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details 
// about supported directives. 
// 
//= require jquery 
//= require jquery_ujs 
//= require bootstrap-sprockets 
//= require icheck 
//= require homer/scripts 
//= require Chart 
//= require excanvas 
//= require channels 
//= require_tree .

當我開始電纜服務器和軌道服務器和本地主機訪問：在Firefox控制檯3000我看到了兩個錯誤：

SyntaxError: An invalid or illegal string was specified 


this.webSocket = new WebSocket(this.consumer.url);

和

TypeError: App.cable is undefined 


App.question = App.cable.subscriptions.create("QuestionChannel", {

我使用的是軌道5測試版3.我該如何解決這個？

來源

2016-03-03 Mateusz Urbański

所以'ActionCable.createConsumer（）'必須返回undefined。 – epascarello

當我在Firefox控制檯鍵入'''ActionCable.createConsumer（）'''返回'''語法錯誤：指定了無效的或非法的串this.webSocket =新的WebSocket（this.consumer.url）;''' –

那麼'this.consumer.url'的價值是什麼？ – epascarello

ActionCable.createConsumer需要一個參數 - 地址作用電纜服務器。

@App = {} 
App.cable = ActionCable.createConsumer("ws://cable.example.com")

如果你錯過了這個參數，那麼this.customer.url是不確定的。

來源

2016-03-03 19:38:56

確保你在你的應用程序了佈局

<%= action_cable_meta_tag %>

地方。

Rails的默認情況下產生，它需要提供電纜的URL作用電纜的照顧，讓您不必將它傳遞給

ActionCable.createConsumer()

。

來源

2016-04-05 12:11:26

TypeError：App.cable未定義

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