Auto-save edits to bubble title

app/javascript/controllers/auto_save_controller.js

@@ -0,0 +1,48 @@
+import { Controller } from "@hotwired/stimulus"
+import { submitForm } from "helpers/form_helpers"
+
+const AUTOSAVE_INTERVAL = 3000
+
+export default class extends Controller {
+  #timer
+
+  // Lifecycle
+
+  disconnect() {
+    this.submit()
+  }
+
+  // Actions
+
+  async submit() {
+    if (this.#dirty) {
+      await this.#save()
+    }
+  }
+
+  change(event) {
+    if (event.target.form === this.element && !this.#dirty) {
+      this.#scheduleSave()
+    }
+  }
+
+  // Private
+
+  #scheduleSave() {
+    this.#timer = setTimeout(() => this.#save(), AUTOSAVE_INTERVAL)
+  }
+
+  async #save() {
+    this.#resetTimer()
+    await submitForm(this.element)
+  }
+
+  #resetTimer() {
+    clearTimeout(this.#timer)
+    this.#timer = null
+  }
+
+  get #dirty() {
+    return !!this.#timer
+  }
+}

app/javascript/helpers/form_helpers.js

@@ -0,0 +1,9 @@
+import { FetchRequest } from "@rails/request.js"
+
+export async function submitForm(form) {
+  const request = new FetchRequest(form.method, form.action, {
+    body: new FormData(form)
+  })
+
+  return await request.perform()
+}

app/views/bubbles/_bubble.html.erb

@@ -9,8 +9,8 @@
     <div>
       <h1 class="bubble__title">
         <% if bubble.creating? %>
-          <%= form_with model: bubble, url: bucket_bubble_path(bubble.bucket, bubble) do |form| %>
-            <%= form.text_field :title, placeholder: "Name it…", class: "input txt-align-center full-width borderless", autofocus: bubble.title.blank? %>
+          <%= form_with model: bubble, url: bucket_bubble_path(bubble.bucket, bubble), data: { controller: "auto-save" } do |form| %>
+            <%= form.text_field :title, placeholder: "Name it…", class: "input txt-align-center full-width borderless", autofocus: bubble.title.blank?, data: { action: "auto-save#change blur->auto-save#submit" } %>
           <% end %>
         <% else %>
           <%= turbo_frame_tag bubble, :edit do %>