Only enhance select element once

app/webpacker/controllers/accessible_autocomplete_controller.js

@@ -3,10 +3,15 @@ import accessibleAutocomplete from "accessible-autocomplete"
 import 'accessible-autocomplete/dist/accessible-autocomplete.min.css'
 
 export default class extends Controller {
+  static values = { enhanced: Boolean, default: false }
+
   connect() {
-    accessibleAutocomplete.enhanceSelectElement({
-      defaultValue: '',
-      selectElement: this.element
-    })
+    if(!this.enhancedValue){
+      accessibleAutocomplete.enhanceSelectElement({
+        defaultValue: '',
+        selectElement: this.element
+      })
+      this.enhancedValue = true
+    }
   }
 }

spec/features/form/accessible_autocomplete_spec.rb

@@ -24,4 +24,12 @@ RSpec.describe "Accessible Automcomplete" do
     find("#case-log-la-field").click.native.send_keys("T", "h", "a", "n", :down, :enter)
     expect(find("#case-log-la-field").value).to eq("Thanet")
   end
+
+  it "maintains enhancement state across back navigation", js: true do
+    visit("/logs/#{case_log.id}/accessible-select")
+    find("#case-log-la-field").click.native.send_keys("T", "h", "a", "n", :down, :enter)
+    click_button("Save and continue")
+    click_link(text: "Back")
+    expect(page).to have_selector("input", class: "autocomplete__input", count: 1)
+  end
 end

spec/fixtures/forms/2021_2022.json

@@ -193,11 +193,12 @@
                     "type": "select",
                     "check_answer_label": "Accessible Select",
                     "answer_options": {
-                      "0": "Adur",
-                      "1": "Lewisham",
-                      "2": "Oxford",
-                      "3": "Thanet",
-                      "4": "York"
+                      "" : "Select an option",
+                      "E07000223": "Adur",
+                      "E09000023": "Lewisham",
+                      "E07000178": "Oxford",
+                      "E07000114": "Thanet",
+                      "E06000014": "York"
                     }
                   }
                 }