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

yousif alyousif
yousif alyousif
2,322 Points
Posted by yousif alyousif
yousif alyousif
2,322 Points

can some one tell me please how to solve this challenge task?

the chan=llenge task request is : In the listener that has been added to the section element, ensure that the text input elements are the only children that trigger the background-changing behavior. i tried to do the same as the video shows but I end up always failing to pass any idea about how to solve it?

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

section.addEventListener('click', (e) => {
  if (e.target.tagName == 'li'){
  e.target.style.backgroundColor = 'rgb(255, 255, 0)'};
});

2 Answers

Stuart Wright
Stuart Wright
41,119 Points
Stuart Wright
Stuart Wright
41,119 Points

You have the right idea, but you need to check if the element is an input tag, not a li tag.

Also note that tag name properties are always uppercase, so you'll need to check for 'INPUT'.

cossy
cossy
17,748 Points
cossy
cossy
17,748 Points

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

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