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HTML Web Storage API


HTML web storage; better than cookies.

What is HTML Web Storage?
With web storage, web applications can store data locally within the user's browser.
Before HTML5, application data had to be stored in cookies, included in
every server request. Web storage is more secure, and large amounts of data
can be stored locally, without affecting website performance.
Unlike cookies,
the storage limit is far larger (at least 5MB) and information is never
transferred to the server.
Web storage is per origin (per domain and protocol). All pages, from one
origin, can store and access the same data.

Browser Support
The numbers in the table specify the first browser version that fully supports
Web Storage.


API







Web Storage
4.0
8.0
3.5
4.0
11.5



HTML Web Storage Objects
HTML web storage provides two objects for storing data on the client:

window.localStorage - stores data with no expiration date
window.sessionStorage - stores data for one session (data is lost when the browser tab is closed)

Before using web storage, check browser support for localStorage and sessionStorage:

if (typeof(Storage) !== "undefined") {
  // Code for localStorage/sessionStorage.
}
else {
  // Sorry! No Web Storage support..
}







The localStorage Object
The localStorage object stores the data with no expiration date. The data
will not be deleted when the browser is closed, and will be available the next day, week, or year.

Example

// StorelocalStorage.setItem("lastname", "Smith");// Retrieve
document.getElementById("result").innerHTML = localStorage.getItem("lastname");

Try it Yourself »

Example explained:

Create a localStorage name/value pair with name="lastname" and value="Smith"
Retrieve the value of "lastname" and insert it into the element with id="result"

The example above could also be written like this:

// StorelocalStorage.lastname = "Smith";// Retrieve
document.getElementById("result").innerHTML = localStorage.lastname;
The syntax for removing the "lastname" localStorage item is as follows:

localStorage.removeItem("lastname");
Note: Name/value pairs are always stored as strings.
Remember to convert them to another format when needed!
The following example counts the number of times a user has clicked a button.
In this code the value string is converted to a number to be able to increase the counter:

Example

if (localStorage.clickcount) {  localStorage.clickcount = Number(localStorage.clickcount) + 1;
} else {  localStorage.clickcount = 1;}
document.getElementById("result").innerHTML = "You have clicked the button " +
localStorage.clickcount + " time(s).";
Try it Yourself »


The sessionStorage Object
The sessionStorage object is equal to the localStorage object, except
that it stores the data for only one session. The data is deleted when the user closes the
specific browser tab.
The following example counts the number of times a user has clicked a button, in the current session:

Example

if (sessionStorage.clickcount) {  sessionStorage.clickcount = Number(sessionStorage.clickcount) + 1;}
else {  sessionStorage.clickcount = 1;}
document.getElementById("result").innerHTML = "You have clicked the button " +
sessionStorage.clickcount + " time(s) in this session.";

Try it Yourself »













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Reference: https://www.w3schools.com/html/html5_webstorage.asp