Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM (Retiring) Responding to User Interaction Event Delegation

Currently, the event listener applies a yellow background color to the section element and its child elements when click


let section = document.getElementsByTagName('section')[0];

section.addEventListener('click', (e) => {
  if (event.target.tagName == 'SECTION') {
  event.target.style.backgroundColor = 'rgb(255, 255, 0)';
      } else if (event.target.tagName == 'INPUT') {
  event.target.style.backgroundColor = 'blue';

<!DOCTYPE html>
        <title>JavaScript and the DOM</title>
    <link rel="stylesheet" href="style.css" />
            <h1>Making a Webpage Interactive</h1>
            <p>JavaScript is an exciting language that you can use to power web servers, create desktop programs, and even control robots. But JavaScript got its start in the browser way back in 1995.</p>
            <p>Things to Learn</p>
                <li>Item One: <input type="text"></li>
                <li>Item Two: <input type="text"></li>
                <li>Item Three: <input type="text"></li>
                <li>Item Four: <input type="text"></li>
        <script src="app.js"></script>

3 Answers

Piotr Manczak
.a{fill-rule:evenodd;}techdegree seal-36
Piotr Manczak
Front End Web Development Techdegree Graduate 29,098 Points

Try this: let section = document.getElementsByTagName('section')[0];

section.addEventListener('click', (e) => {

if (e.target.tagName == 'INPUT') {

e.target.style.backgroundColor = 'rgb(255, 255, 0)';



Linas Mackonis
Linas Mackonis
7,071 Points

Hi, this should work:

let section = document.getElementsByTagName('section')[0];
let input = document.getElementsByTagName('input');

for(let i = 0; i < input.length; i += 1) {
input[i].addEventListener('click', (e) => {
  e.target.style.backgroundColor = 'rgb(255, 255, 0)';

Michael Barlow
Michael Barlow
34,317 Points

You're also referencing event from within the callback, which is (probably) undefined in that scope. You've defined the event argument as e, so use that to get a reference to the target: e.target...