What is document.getElementById in javascript?

Answer 1

document.getElementById() is a JavaScript method that returns a reference to a DOM object identified by the value passed to it. For instance, if you can a form with the following HTML code....

<form method="post" id="theForm">

You would be able to reference the form by assigning a variable to the returned value of document.getElementById(). Such as:

var myForm = document.getElementById("theForm");

You could them use the other DOM methods to manipulate this object (adding CSS styles, adding and removing children, etc.)

Answer 2

The instruction document.getElementById is used in JavaScript, followed by a unique ID. It identifies and returns the HTML element that has the specified ID.