JavaScript DataView()

JavascriptWeb DevelopmentFront End Technology

The JavaScript DataView allows us for reading and writing in multiple number types in binary ArrayBuffer by providing a low level interface. We cannot manipulate ArrayBuffer directly without using DataView().

Following is the code for implementing JavaScript DataView −


 Live Demo

<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   .sample {
      font-size: 20px;
      font-weight: 500;
<h1>JavaScript DataView()</h1>
<div class="sample"></div>
<button class="Btn">CLICK HERE</button>
Click on the above button to change the array buffer contents using
   let fillEle = document.querySelector(".sample");
   var buffer = new ArrayBuffer(8);
   var view1 = new DataView(buffer);
   view1.setInt16(0, 0x2721);
   fillEle.innerHTML = view1.getInt16(0).toString(16);
   document.querySelector(".Btn").addEventListener("click", () => {
      fillEle.innerHTML = view1.getInt16(0).toString(2);


On clicking the “CLICK HERE” button −

Published on 08-May-2020 14:38:27