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

Nazeim Brame
Nazeim Brame
6,544 Points
Posted by Nazeim Brame
Nazeim Brame
6,544 Points

Don't know where to start. I feel like this wasn't covered in the previous videos.

Do I need to create a variable for input and then repeat line of code inside the addEventListner?

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

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

2 Answers

Oliver Duran
.a{fill-rule:evenodd;}techdegree seal-36
Oliver Duran
Full Stack JavaScript Techdegree Graduate 22,828 Points

Hello! This challenge is asking you for a (CONDITION) to only target the input elements on the page instead of all of them as the condition defined in the challange is doing. Try this:

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

section.addEventListener('click', (e) => { if (e.target.tagName === "INPUT"){ <==(This right here is the condition) e.target.style.backgroundColor = "rgb(255, 255, 0)"; } }); Good Luck!

A R
A R
12,834 Points
A R
A R
12,834 Points

So the challenge says "Add a condition that changes the background of the <input> elements only." You'll start by getting all the inputs. You'll have to loop though and attach an event listener to each of the things in the INPUT collection. 

let input = document.getElementsByTagName('input')

in the video "Listening for Events with addEventListener()" there will be a section to help you at about 6:00 in