- In HTML5, web storage is one of the great features. In Web storage, web applications can locally store data within the browser on the client side.
- It is sometimes known as DOM storage and stores data in the form of key/value pair on the browser.
- Web storage is better and faster than cookies storage, and storing data is similar to cookies.
- Similarly, Web Storage can use storage space of up to 5MB per domain.
- It is faster than cookies storage because It will not send data to the server side.
- At web storage cookies data expires after some time or session but data stored by local Storage never expires.
- There are two types of web storage, they are;
- Local Storage
- Session Storage
Local Storage
- In this the local Storage object stores data locally within the browser.
- The data stored by local Storage object does not have any expiration date.
- The stored data will not be deleted if the browser is reopened or closed.
- The key/values are always stored as String, and can be accessed with localStorage.setItem() and localStorage.getItem() methods.
Sample Code
<!DOCTYPE html>
<html>
<head>
<title>Web Storage API</title>
<style>
body{
color: blue;
text-align: center;
font-size: 30px;
margin-top: 30px;
font-style: italic;
}
</style>
</head>
<body>
<script>
if(typeof(Storage)!=="undefined") {
localStorage.setItem("name","Venkat");
localStorage.setItem("Country", "India");
document.write("Hi this is"+" "+localStorage.name+" "+"from" +" "+ localStorage.Country);
}
else{
alert("Sorry! your browser is not supporting the browser")
}
</script>
</body>
</html>
Output
Session Storage
- The session storage is same as local storage, but session storage stores data only for one session.
- If you close the browser, then data will be deleted or lost.
Sample Code
<!DOCTYPE html>
<html>
<head>
<script>
function clickCounter() {
if (typeof(Storage) !== "undefined") {
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.";
} else {
document.getElementById("result").innerHTML = "Sorry, your browser does not support web storage...";
}
}
</script>
</head>
<body>
<p><button onclick="clickCounter()" type="button">Click me!</button></p>
<div id="result"></div>
<p>Click the button to see the counter increase.</p>
<p>Close the browser tab (or window), and try again, and the counter is reset.</p>
</body>
</html>
Output
