#keyboard-navigation code explainers

javascript

const FOCUSABLE = [
  'a[href]',
  'button:not([disabled])',
  'input:not([disabled])',

How to trap keyboard focus in a dialog

accessibility dom event-handling

Intermediate 8 steps

javascript

import { useState, useRef, useCallback } from "react";
 
export function MultiSelect({ options, value, onChange, placeholder = "Select…" }) {
  const [open, setOpen] = useState(false);

Building a keyboard-accessible MultiSelect in React

controlled-component accessibility keyboard-navigation

Intermediate 10 steps

javascript

import { useCallback, useEffect, useRef } from 'react';
import { createPortal } from 'react-dom';
 
const FOCUSABLE = 'a[href], button:not([disabled]), textarea, input, select, [tabindex]:not([tabindex="-1"])';

Building an accessible modal in React

focus-trap accessibility portals

Advanced 9 steps

typescript

import { Directive, ElementRef, HostListener, Input, OnDestroy, OnInit } from '@angular/core';
 
@Directive({
  selector: '[appTrapFocus]',

Building a focus-trap directive in Angular

accessibility focus-management dom

Intermediate 9 steps