JavaScript localStorage Event Handler Example [SOLVED]


Written By - Olorunfemi Akinlua
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Introduction

JavaScript is a programming language that is commonly used in web development. One of the features of JavaScript is the ability to store data locally in the user's browser using the localStorage object. This allows developers to store data on the user's computer and access it later, even if the user is offline or has closed the browser.

In this article, we will demonstrate how to use the localStorage object to store data and how to add an event handler to listen for changes to the data. This can be useful for creating responsive and dynamic user interfaces that update in real time when data is changed.

Here are some examples of how you can use event handlers with the localStorage object in JavaScript:

 

Listening for the storage event

The storage event is fired on the window object whenever a value is added to or removed from localStorage. You can use this event to listen for changes to localStorage and take some action based on those changes.

Here's an example of how you can listen for the storage event:

window.addEventListener('storage', (event) => {
  console.log(`Key "${event.key}" was added or removed from localStorage`);
});

In this example, we use the addEventListener() method to register a callback function that will be called whenever the storage event is fired. The callback function logs a message to the console indicating that a key was added or removed from localStorage.

 

Setting a value in localStorage and listening for the storage event

Here's an example of how you can set a value in localStorage and listen for the storage event to be fired:

localStorage.setItem('myKey', 'myValue');

window.addEventListener('storage', (event) => {
  console.log(`Key "${event.key}" was added or removed from localStorage`);
});

In this example, we use the setItem() method to add a key-value pair to localStorage. Then, we use the addEventListener() method to register a callback function that will be called whenever the storage event is fired.

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Getting value from localStorage

Here's an example of how you can get value from localStorage:

const value = localStorage.getItem('myKey');

console.log(value);

In this example, we use the getItem() method to retrieve the value associated with the 'myKey' key from localStorage. The value is then logged to the console.

 

Summary

JavaScript's localStorage object allows developers to store data locally in the user's browser. The storage event can be used to listen for changes to the data in localStorage and take some action based on those changes. The setItem() and getItem() methods can be used to add and retrieve data from localStorage, respectively.

 

References

Window: storage event - Web APIs | MDN (mozilla.org)

 

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