我正在使用 Action Cable，想知道您如何检测同一用户是否打开了多个选项卡或连接，并在必要时将其删除。我有一个下载任务执行多次，我只希望它执行一次。

    class ListsChannel < ApplicationCable::Channel
      def subscribed
        stream_from "channel"
      end
    # # TODO code to detect multiple streams and delete them if tabs.

      # def unsubscribed
      # end


    end

最佳答案

Note: this is probably not the exact answer you're looking for, but it might inspire you or others for a different solution.

我遇到了这个有类似问题的问题，但是关于在多个选项卡上显示相同的通知。

对我来说，解决方案实际上是构建到 Notifications API 中，通过使用标签，它只会在多个选项卡上显示一次通知:

let notification = new Notification('Hey!', {
    body : 'So nice to hear from you',
    tag : 'greeting-notify',
    icon : 'https://example.org/my_funny_icon.png'
});

也许对您来说解决方案是使用此 API 将您的下载链接推送到:

Notification.requestPermission().then(function (result) {})

import consumer from "./consumer"

consumer.subscriptions.create("ReportNotificationChannel", {
    connected() {},

    disconnected() {},

    received(data) {
        if (Notification.permission === 'granted') {
            let title = `Your file is ready!`
            let options = { body: 'Click here to start downloading.', tag: data['filename']} // Assuming filename is something unique
            let notification = new Notification(title, options)
            notification.onclick = function(event){
                window.location.href = `/downloads/${data['filename']}`
            }
        }
    }
});

关于ruby-on-rails - Action 电缆检测多个连接/选项卡，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57469762/