remove onsubmit html event

app/javascript/elements/toggle_submit.js

@@ -0,0 +1,21 @@
+export default class extends HTMLElement {
+  connectedCallback () {
+    this.button.disabled = false
+
+    this.form.addEventListener('submit', () => {
+      this.button.disabled = true
+    })
+  }
+
+  disconnectedCallback () {
+    this.button.disabled = false
+  }
+
+  get button () {
+    return this.querySelector('[type="submit"]')
+  }
+
+  get form () {
+    return this.querySelector('form') || this.closest('form')
+  }
+}