add shared link form fields preferences

app/javascript/elements/required_checkbox_group.js

@@ -0,0 +1,17 @@
+export default class extends HTMLElement {
+  connectedCallback () {
+    this.querySelectorAll('input[type="checkbox"]').forEach(checkbox => {
+      checkbox.addEventListener('change', this.handleChange)
+    })
+  }
+
+  handleChange = () => {
+    if (this.checkedCount !== 0) {
+      this.closest('form')?.requestSubmit()
+    }
+  }
+
+  get checkedCount () {
+    return this.querySelectorAll('input[type="checkbox"]:checked').length
+  }
+}