Auto save comments to local storage to prevent losing work

app/javascript/controllers/autosave_controller.js

@@ -0,0 +1,50 @@
+import { Controller } from "@hotwired/stimulus"
+import { debounce } from "helpers/timing_helpers"
+
+export default class extends Controller {
+  static targets = ["input"]
+  static values = { key: String }
+  
+  initialize() {
+    this.debouncedSave = debounce(() => {
+      const content = this.inputTarget.value
+      if (content) {
+        localStorage.setItem(this.keyValue, content)
+      } else {
+        this.clear()
+      }
+    }, 300)
+  }
+  
+  connect() {
+    this.restoreContent()
+  }
+  
+  submit({ detail: { success } }) {
+    if (success) {
+      this.clear()
+    }
+  }
+
+  save() {
+    this.debouncedSave()
+  }
+  
+  clear() {
+    localStorage.removeItem(this.keyValue)
+  }
+  
+  restoreContent() {
+    const savedContent = localStorage.getItem(this.keyValue)
+    if (savedContent) {
+      this.inputTarget.value = savedContent
+      this.inputTarget.dispatchEvent(new CustomEvent('house-md:change', {
+        bubbles: true,
+        detail: { 
+          previousContent: '',
+          newContent: savedContent 
+        }
+      }))
+    }
+  }
+} 

app/views/comments/_new.html.erb

@@ -2,9 +2,11 @@
   <div class="flex flex-column full-width">
     <div class="position-relative">
       <%= form_with model: Comment.new, url: bucket_bubble_comments_path(bubble.bucket, bubble), class: "flex flex-column gap full-width", 
-            data: { controller: "form paste", 
-                   action: "keydown.ctrl+enter->form#submit:prevent keydown.meta+enter->form#submit:prevent keydown.esc->form#cancel:stop paste->paste#pasteFiles" } do |form| %>
-        <%= form.markdown_area :body, class: "input comment__input", required: true, placeholder: new_comment_placeholder(bubble) %>
+            data: { controller: "form paste autosave",
+                   autosave_key_value: "comment-#{bubble.id}",
+                   action: "turbo:submit-end->autosave#submit keydown.ctrl+enter->form#submit:prevent keydown.meta+enter->form#submit:prevent keydown.esc->form#cancel:stop paste->paste#pasteFiles" } do |form| %>
+        <%= form.markdown_area :body, class: "input comment__input", required: true, placeholder: new_comment_placeholder(bubble),
+              data: { autosave_target: "input", action: "house-md:change->autosave#save" } %>
         <%= form.button class: "comment__submit btn btn--reversed flex-item-justify-end txt-small" do %>
           <%= image_tag "check.svg", aria: { hidden: "true" }, size: 24 %>
           <span class="for-screen-reader">Save</span>