action-cable-js-client.md

If you are using Rails, then you already has a app/assets/javascripts/cable.js file that requires action_cable, you just need to connect to the right URL (don't forgot the settings you used), to authenticate using JWT use something like:

(function() {
  this.App || (this.App = {});

  App.cable = ActionCable.createConsumer(
  "ws://localhost:5000/cable?token=JWT_TOKEN" // if using the default options
  );
}.call(this));

then on your app/assets/javascripts/channels/chat.js

App.channels || (App.channels = {});

App.channels["chat"] = App.cable.subscriptions.create(
{
  channel: "ChatChannel",
  room: "1"
},
{
  connected: function() {
    return console.log("ChatChannel connected");
  },
  disconnected: function() {
    return console.log("ChatChannel disconnected");
  },
  received: function(data) {
    return console.log("ChatChannel received", data);
  },
  rejected: function() {
    return console.log("ChatChannel rejected");
  },
  away: function() {
    return this.perform("away");
  },
  status: function(status) {
    return this.perform("status", {
      status: status
    });
  }
}
);

Then on your Browser console you can see the message:

ChatChannel connected

After you load, then you can broadcast messages with:

App.channels["chat"].send({ message: "Hello World" });

And performs an action with:

App.channels["chat"].perform("status", { status: "My New Status" });