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Learn ECMAScript

You're reading from   Learn ECMAScript Discover the latest ECMAScript features in order to write cleaner code and learn the fundamentals of JavaScript

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Product type Paperback
Published in Feb 2018
Publisher
ISBN-13 9781788620062
Length 298 pages
Edition 2nd Edition
Languages
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Authors (2):
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Narayan Prusty Narayan Prusty
Author Profile Icon Narayan Prusty
Narayan Prusty
MEHUL MOHAN MEHUL MOHAN
Author Profile Icon MEHUL MOHAN
MEHUL MOHAN
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Toc

Table of Contents (14) Chapters Close

Preface 1. Getting Started with ECMAScript 2. Knowing Your Library FREE CHAPTER 3. Using Iterators 4. Asynchronous Programming 5. Modular Programming 6. Implementing the Reflect API 7. Proxies 8. Classes 9. JavaScript on the Web 10. Storage APIs in JavaScript 11. Web and Service Workers 12. Shared Memory and Atomics 13. Other Books You May Enjoy

Handling storage changes across multiple tabs


Storage, when changed, emits certain events that can be captured by other opened tabs. You can set event listeners for them to listen and perform any appropriate modifications.

For example, let's say that you added something to localStorage in one tab of your website. A user has also opened another tab of your website. If you want to reflect the changes of localStorage in that tab, you can listen to the storage event and update the contents accordingly.

Note that the update event will be fired on every other tab except the one that made the change:

window.addEventListener('storage', e => { 
  console.log(e);
});
localStorage.setItem('myKey', 'myValue'); // note that this line was run in another tab

The preceding code produces the following output:

You can note that it contains a lot of useful information about the storage event.

Note

The web workers (discussed in Chapter 11) do not have access to local storage or session storage.

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