JavaScript SessionStorage Example

The sessionStorage object stores data for only one session (the data is deleted when the browser tab is closed).

JavaScript  SessionStorage Methods

To use SessionStorage in your web applications, there are 5 methods to choose from:

1. setItem(): Add key and value to SessionStorage
2. getItem(): Retrieve a value by the key from SessionStorage
3. removeItem(): Remove an item by key from SessionStorage
4. clear(): Clear all SessionStorage
5. key(): Passed a number to retrieve nth key of a SessionStorage

Syntax

window.sessionStorage

The syntax for SAVING data to sessionStorage:

sessionStorage.setItem("key", "value");

The syntax for READING data from sessionStorage:

var lastname = sessionStorage.getItem("key");

The syntax for REMOVING saved data from sessionStorage:

sessionStorage.removeItem("key");

The syntax for REMOVING ALL saved data from sessionStorage:

sessionStorage.clear();

Syntax for Key() Method:

var KeyName = sessionStorage.key(index);

Let's demonstrate each method of SessionStorage with example.

JavaScript  SessionStorage Example

Use the setItem() method, which takes two parameters, a key and a value. The key can be referenced later to fetch the value attached to it.

sessionStorage.setItem("firstName", "Ramesh");

Where "firstName" is the key and "Ramesh" is the value. Also, note that unlike LocalStorage, the sessionStoragecan only store strings.

To store arrays or objects you would have to convert them to strings.

To do this we use the JSON.stringify() method before passing to setItem() .

var user = {
 firstName : "Ramesh",
 lastName : "Fadatare"
}
sessionStorage.setItem("id", JSON.stringify(user));

To retrieve the user object from the key stored above:

sessionStorage.getItem('id');

This returns a string with value as;

"{"firstName":"Ramesh","lastName":"Fadatare"}"

Let's use the removeItem() method to remove the item from the key. Let's remove the user object previously stored using setItem() method:

sessionStorage.removeItem('id');

when invoked clears the entire storage of all records for that domain. It does not receive any parameters.

sessionStorage.clear();

Reference

https://www.javaguides.net/2019/05/javascript-sessionstorage-methods.html

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