HTML DOM Storage Event

HTML Web Development Front End Technology

The HTML DOM storage event triggers when there has been a change in the storage area of the window. The storage event is triggered only if the other window makes the storage area change for a window. This event doesn’t bubble and is cancellable too.

Syntax

Following is the syntax for −

window.addEventListener("storage", SCRIPT);

Example

Let us look at an example for the Storage Event −

<!DOCTYPE html>
<html>
<body>
<h1>Storage Event Example</h1>
<p>Create the visit localStorage item by clicking the below button</p>
<button onclick="CreateVisits()">CREATE</button>
<p id="Sample"></p>
<script>
   var y=1;
   window.addEventListener("storage", DisplayChange);
   function DisplayEvent(event) {
      document.getElementById("Sample").innerHTML = "The number of visits has been updated";
   }
   function CreateVisits() {
      y++;
      var x=window.open("","WINDOW_1","width=350,height=350");
      x.localStorage.setItem("VISITS",y);
      setTimeout(function () { x.close();}, 4000);
   }
</script>
</body>
</html>