show bulk send message

app/javascript/application.js

@@ -20,6 +20,7 @@ import FolderAutocomplete from './elements/folder_autocomplete'
 import SignatureForm from './elements/signature_form'
 import SubmitForm from './elements/submit_form'
 import PromptPassword from './elements/prompt_password'
+import EmailsTextarea from './elements/emails_textarea'
 
 import * as TurboInstantClick from './lib/turbo_instant_click'
 
@@ -53,6 +54,7 @@ window.customElements.define('folder-autocomplete', FolderAutocomplete)
 window.customElements.define('signature-form', SignatureForm)
 window.customElements.define('submit-form', SubmitForm)
 window.customElements.define('prompt-password', PromptPassword)
+window.customElements.define('emails-textarea', EmailsTextarea)
 
 document.addEventListener('turbo:before-fetch-request', encodeMethodIntoRequestBody)
 document.addEventListener('turbo:submit-end', async (event) => {

app/javascript/elements/emails_textarea.js

@@ -0,0 +1,56 @@
+const emailRegexp = /([^@;,<>\s]+@[^@;,<>\s]+)/g
+
+export default class extends HTMLElement {
+  connectedCallback () {
+    if (this.dataset.limit) {
+      this.textarea.addEventListener('input', () => {
+        const emails = this.textarea.value.match(emailRegexp) || []
+
+        this.updateCounter(emails.length)
+      })
+    }
+  }
+
+  updateCounter (count) {
+    let counter = document.getElementById('emails_counter')
+    let bulkMessage = document.getElementById('bulk_message')
+
+    if (count < 2) {
+      counter?.remove()
+
+      return
+    }
+
+    if ((count + 10) > this.dataset.limit) {
+      if (!counter) {
+        counter = document.createElement('span')
+
+        counter.id = 'emails_counter'
+        counter.classList.add('text-xs', 'right-0', 'absolute')
+        counter.style.bottom = '-15px'
+
+        this.textarea.parentNode.append(counter)
+      }
+
+      counter.innerText = `${count} / ${this.dataset.limit}`
+    }
+
+    if (this.dataset.bulkEnabled !== 'true') {
+      if (!bulkMessage) {
+        bulkMessage = document.createElement('span')
+
+        bulkMessage.id = 'bulk_message'
+        bulkMessage.classList.add('text-xs', 'left-0', 'absolute')
+        bulkMessage.style.bottom = '-15px'
+
+        this.textarea.parentNode.append(bulkMessage)
+      }
+
+      bulkMessage.innerHTML = '<a class="link" data-turbo="false" href="/upgrade">Upgrade</a> to bulk send multiple recipients'
+    }
+  }
+
+  get textarea () {
+    return this.querySelector('textarea')
+  }
+}

app/javascript/elements/submitter_autocomplete.js

@@ -28,6 +28,8 @@ export default class extends HTMLElement {
 
       if (textarea && item[field]) {
         textarea.value = textarea.value.replace(/[^;,\s]+$/, item[field] + ' ')
+
+        textarea.dispatchEvent(new Event('input', { bubbles: true }))
       }
     })
   }