update send modal

app/javascript/elements/append_template.js

@@ -0,0 +1,29 @@
+export default class extends HTMLElement {
+  connectedCallback () {
+    this.addEventListener('click', this.onClick)
+  }
+
+  disconnectedCallback () {
+    this.removeEventListener('click', this.onClick)
+  }
+
+  onClick = (e) => {
+    e.preventDefault()
+
+    const target = document.getElementById(this.dataset.targetId)
+    const item = this.querySelector('template').content.firstElementChild.cloneNode(true)
+
+    item.querySelector('a').addEventListener('click', (e) => {
+      e.preventDefault()
+
+      item.remove()
+
+      target.classList.toggle('hidden', !target.childElementCount)
+    })
+
+    target.append(item)
+    target.classList.remove('hidden')
+
+    item.querySelector('input').focus()
+  }
+}