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

Posted by Nicholas King
Nicholas King
3,350 Points

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

Stuck here, please help.

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

section.addEventListener('click', (e) => {
 if(e.target.tagName === 'INPUT') {
  e.target.backgroundColor = 'rgb(255, 255, 0)';
}
index.html 
<!DOCTYPE html>
<html>
    <head>
        <title>JavaScript and the DOM</title>
    </head>
    <link rel="stylesheet" href="style.css" />
    <body>
        <section>
            <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>
            <hr>
            <p>Things to Learn</p>
            <ul>
                <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>
            </ul>
            <button>Save</button>
        </section>
        <script src="app.js"></script>
    </body>
</html>
Ashish Mehra
Ashish Mehra
2,411 Points

Hi Nicholas King,

In the challenge you have to change the background colour of input when user clicks on it. For that you need to select input element in your event listener callback.

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

section.addEventListener('click', (e) => {
  const input = section.querySelector('input');
  input.style.backgroundColor = 'rgb(255, 255, 0)';
});

1 Answer

Nicholas King
Nicholas King
3,350 Points
Nicholas King
Nicholas King
3,350 Points

Thanks man.