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Not Rendering with Stimulus & ActionCable

Jim Miller asked in Javascript

Hi,
I'm having some issues with Stimulus and I was hoping that someone could review this code and see if they see anything that I missed.
The Rails part is working and saving to the db. I'm sure that I have a typo somewhere...

Here is what I have:

app/channels/message_channel.rb

class MessageChannel < ApplicationCable::Channel
  def subscribed
    stream_from 'message_channel'
  end

  def unsubscribed
    stop_all_streams
  end
end

app/javascript/controllers/message_list_controller.js

import { Controller } from "stimulus";
import consumer from "../channels/consumer";

export default class extends Controller {
  static targets = ["input", "messages"];
  connect() {
    this.channel = consumer.subscriptions.create("MessageChannel", {
      connected: this._cableConnected.bind(this),
      disconnected: this._cableDisconnected.bind(this),
      received: this._cableReceived.bind(this),
    });
  }

  clearInput() {
    this.inputTarget.value = "";
  }

  _cableConnected() {}

  _cableDisconnected() {}

  _cableReceived() {
    this.messagesTarget.innerHTML += data.message;
  }
}

app/controllers/messages_controller.rb

class MessagesController < ApplicationController
  before_action :set_message, only: [:show, :edit, :update, :destroy]

  def index
    @messages = Message.all
  end

  def create
    @message = Message.new(params.require(:message).permit(:content))
    @message.save!
    ActionCable.server.broadcast('message_channel', message: (render @message))
    head :ok
  end


  private
  def set_message
    @message = Message.find(params[:id])
  end

  def message_params
    params.require(:message).permit(:content)
  end
end

app/views/messages/index.html.erb

<p id="notice"><%= notice %></p>

<h1>Messages</h1>

<div data-controller='message-list'>
  <div data-target='message-list.messages'>
    <%= render @messages %>
  </div>

  <%= form_with(model: Message.new, 
                data: { action: 'ajax:success->message-list#clearInput' }) do |form| %>
                <%= form.text_area :content, 
                  data: { target: 'message-list.input' }, rows: 1, autofocus: true %>
                <%= form.submit class: "btn btn-default" %>
              <% end %>
</div>

Gist of Logfile

Thanks!

Reply

In case someone stumbles across this and needs an answer. Modify message_list_controller:

app/javascript/controllers/message_list_controller.js

_cableReceived(data) {
    this.messagesTarget.innerHTML += data.message;
  }
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