From 9415011b5fd192f1bafeaa9b6eacbb7921382a00 Mon Sep 17 00:00:00 2001
From: David Gay <david@davidgay.org>
Date: Wed, 19 May 2021 22:53:38 -0400
Subject: Chat

---
 app/javascript/channels/chat_room_channel.js  | 22 ++++++++++++++
 app/javascript/controllers/chat_controller.js | 42 +++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 app/javascript/channels/chat_room_channel.js
 create mode 100644 app/javascript/controllers/chat_controller.js

(limited to 'app/javascript')

diff --git a/app/javascript/channels/chat_room_channel.js b/app/javascript/channels/chat_room_channel.js
new file mode 100644
index 0000000..8dfa47f
--- /dev/null
+++ b/app/javascript/channels/chat_room_channel.js
@@ -0,0 +1,22 @@
+import consumer from "./consumer"
+
+consumer.subscriptions.create("ChatRoomChannel", {
+  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
+    var node = document.createElement("P");
+    node.innerHTML = data.html;
+    var chatOutputElement = document.getElementById("chat_output");
+    chatOutputElement.appendChild(node);
+    chatOutputElement.scrollTo({
+      top: chatOutputElement.scrollHeight, left: 0, behavior: 'smooth'
+    });
+  }
+});
diff --git a/app/javascript/controllers/chat_controller.js b/app/javascript/controllers/chat_controller.js
new file mode 100644
index 0000000..d9cf1cb
--- /dev/null
+++ b/app/javascript/controllers/chat_controller.js
@@ -0,0 +1,42 @@
+import { Controller } from "stimulus";
+
+export default class extends Controller {
+  static targets = [ "message", "output" ];
+
+  connect() {
+    this.load();
+  }
+
+  send() {
+    let vm = this;
+    // TODO: Temporary hack. Should just run this after default event.
+    setTimeout(function() {
+      vm.messageTarget.value = "";
+      vm.smoothScrollToBottom();
+    }, 100);
+  }
+
+  load() {
+    this.scrollToBottom();
+    if (this.outputTarget.innerHTML.trim() === "") {
+      fetch("/chat_messages")
+        .then(response => response.text())
+        .then(html => {
+          this.outputTarget.innerHTML = html;
+          this.scrollToBottom();
+        });
+    }
+  }
+
+  scrollToBottom() {
+    this.outputTarget.scrollTop = this.outputTarget.scrollHeight;
+  }
+
+  smoothScrollToBottom() {
+    this.outputTarget.scrollTo({
+      top: this.outputTarget.scrollHeight,
+      left: 0,
+      behavior: 'smooth'
+    });
+  }
+}
-- 
cgit v1.2.3