Learn JavaScript for Web Development

JavaScript is most versatile languages to code applications for the browser, desktop, phone or tablet. Write program for client browser or web server. Build interactive web site with JavaScript.

document.getElementById Method

The document.getElementById() method returns the element of specified id.

In the previous page, we have used document.form1.name.value to get the value of the input value. Instead of this, we can use document.getElementById() method to get value of the input text. But we need to define id for the input field.

Let's see the simple example of document.getElementById() method that prints cube of the given number.

<script type="text/javascript">
function getcube(){
var number=document.getElementById("number").value;
Enter No:<input type="text" id="number" name="number"/><br/>
<input type="button" value="cube" onclick="getcube()"/>


Enter No: