fixin.me/app/javascript/controllers/form_controller.js

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  connect() {
    const autofocusEl = this.element.querySelector('[autofocus]')
    if (autofocusEl) {
      document.activeElement?.blur()
      autofocusEl.focus()
    }
  }

  processKey(event) {
    switch (event.key) {
      case "Escape":
        this.element.querySelector("a[name=cancel]").click()
        break
      case "Enter":
        this.element.querySelector("button[name=button]").click()
        event.preventDefault()
        break
    }
  }

  validate(event) {
    const id = event.submitter?.getAttribute("data-validate")
    if (!id) return
    const input = document.getElementById(id)
    if (!input.checkValidity()) {
      input.reportValidity()
      event.preventDefault()
    }
  }
}