Submitting form from the new combos

app/javascript/controllers/combobox_controller.js

@@ -1,7 +1,7 @@
 import { Controller } from "@hotwired/stimulus"
 
 export default class extends Controller {
-  static targets = [ "label", "item" ]
+  static targets = [ "label", "item", "hiddenField" ]
   static values = { selectPropertyName: { type: String, default: "aria-checked" } }
 
   connect() {
@@ -16,8 +16,7 @@ export default class extends Controller {
   }
 
   get #selectedLabel() {
-    const label = this.#selectedItem.querySelector("[data-combobox-label]")
-    return label.dataset.comboboxLabel
+    return this.#selectedItem?.dataset?.comboboxLabel || ""
   }
 
   get #selectedItem() {
@@ -28,6 +27,7 @@ export default class extends Controller {
     this.#clearSelection()
     item.setAttribute(this.selectPropertyNameValue, "true")
     this.labelTarget.textContent = this.#selectedLabel
+    this.hiddenFieldTarget.value = item.dataset.comboboxValue
   }
 
   #clearSelection() {