submit-social-housing-lettings-and-sales-data/app/frontend/controllers/accessible_autocomplete_controller.js

import { Controller } from '@hotwired/stimulus'
import accessibleAutocomplete from 'accessible-autocomplete'
import 'accessible-autocomplete/dist/accessible-autocomplete.min.css'
import { enhanceOption, suggestion, sort } from '../modules/search'

export default class extends Controller {
  connect () {
    const selectEl = this.element
    const selectOptions = Array.from(selectEl.options).filter(function (option, index, arr) { return option.value !== '' })
    const options = selectOptions.map((o) => enhanceOption(o))

    const matches = /^(\w+)\[(\w+)\]$/.exec(selectEl.name)
    const rawFieldName = matches ? `${matches[1]}[${matches[2]}_raw]` : ''

    accessibleAutocomplete.enhanceSelectElement({
      defaultValue: '',
      selectElement: selectEl,
      minLength: 1,
      source: (query, populateResults) => {
        if (/\S/.test(query)) {
          populateResults(sort(query, options))
        }
      },
      autoselect: true,
      placeholder: 'Start typing to search',
      templates: { suggestion: (value) => suggestion(value, options) },
      name: rawFieldName,
      onConfirm: (val) => {
        const selectedOption = [].filter.call(
          selectOptions,
          (option) => (option.textContent || option.innerText) === val
        )[0]
        if (selectedOption) selectedOption.selected = true
      }
    })

    const parentElement = selectEl.parentElement
    const inputElement = parentElement.querySelector('[role=combobox]')

    inputElement.addEventListener('input', () => {
      selectOptions.forEach((option) => { option.selected = false })
    })
  }
}