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Andy Leverenz

August 16, 2018

Last updated November 5, 2023

Let's Build: With JavaScript - Broadcast Bar with Cookies

I'm back at it with the Let's Build: With JavaScript series. In this video learn how to build a broadcast bar with cookies using vanilla JavaScript and some elbow grease.

View source code

Slowly but surely I'll be contributing to this series more as I find realistic examples worthy of teaching. I like to learn by solving problems. Building things rather than just reading books, following long-form blog post tutorials and the occasional video tutorial makes a larger impact. In many cases, those who author these "help" documents don't actually teach anything other than the language itself. Rather than go down that path, I strive to create real examples. I do this to better understand the problem and solution. I also get to teach you at the same time. Win-win!

This particular example utilizes some browser technologies to create a cookie for any user who navigates to your page and closes a broadcast banner. If they did indeed click the "X" icon, a cookie gets stored for 7 days in their browser.

This solution isn't foolproof as a user can just clear their cookies to see the broadcast bar again, but it does allow you to leverage storing something without needing a user to be signed in to some sort of session.

Give this a shot on your own and see what you come up with.


<div class="broadcast">
  <div class="container"> Help improve Affinicasts by taking a short survey. <a href="" target="_blank">Add your response</a>

  <div class="hide-broadcast">
    <a href="#" class="hide-broadcast-target">
        <svg width="20" height="20" viewBox="0 0 20 20"><path d="M10.707 10.5l5.646-5.646a.5.5 0 0 0-.707-.707L10 9.793 4.354 4.147a.5.5 0 0 0-.707.707L9.293 10.5l-5.646 5.646a.5.5 0 0 0 .708.707l5.646-5.646 5.646 5.646a.498.498 0 0 0 .708 0 .5.5 0 0 0 0-.707L10.709 10.5z"></path></svg>

<div class="moar-content container">
    Lorem ipsum dolor sit amet consectetur adipisicing elit. Maiores dolorem ea similique ullam, ipsam explicabo facere facilis, quibusdam cupiditate suscipit eaque commodi alias sint? Minus consequuntur deleniti quas quia nesciunt.

  <p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Consequatur nemo unde dignissimos dolore vitae provident optio molestiae excepturi quae fugiat nisi libero nulla, nesciunt repellat odio quia ullam? Sequi, voluptate.</p>


 @import url('');

$brand-secondary: #F3B823;
$text-color: #444;

* {
  margin: 0; 
  padding: 0;

.container {
  max-width: 1170px;
  margin: 0 auto;

.broadcast {
  padding: .6rem 0;
  color: white;
  display: flex;
  text-align: center;
  font-family: 'Muli', sans-serif;

.broadcast {
  background: #444;
  position: relative;
  font-weight: bold;

  a {
    color: $brand-secondary;
    text-decoration: none;

  .hide-broadcast {
    position: absolute;
    right: 20px;
    top: 3px;

    svg {
      fill: white;
      width: 20px;
      height: 20px;
      position: relative;
      top: 2px;

    .hide-broadcast-target {
      width: 24px;
      height: 24px;
      display: inline-block;
      border-radius: 50%;
      padding: 4px;
      transition: all ease .3s;

    &:hover {
      .hide-broadcast-target {
        background: rgba(white, .9);
        svg { fill: $text-color; }

.moar-content {
  padding: 3rem 0;
  font-size: 16px;
  font-family: "Muli", sans-serif;

  p {
    margin-bottom: 1.6rem;


The main focus of this tutorial is this code.

var broadcast = document.querySelector('.broadcast');
var closeBroadcast = document.querySelector('.hide-broadcast-target');
var cookie = readCookie('hide_broadcast_bar');

if (cookie == "true") { = "none";

closeBroadcast.addEventListener('click', function(e) {
  if(cookie != "true") { = "none";
    createCookie('hide_broadcast_bar', "true", 7);

function createCookie(name, value, days) {
  if(days) {
    var date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    var expires = "; expires=" + date.toGMTString();
  } else var expires = "";
  document.cookie = name + "=" + value + expires + "; path=/"

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for (var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == ' ') c = c.substring(1, c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);

  return null;

function eraseCookie(name) {
  createCookie(name, "", -1);

Check out the series so far

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Est. reading time: 3 minutes
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