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

Tolani Akinyemi
Tolani Akinyemi
5,801 Points
Posted by Tolani Akinyemi
Tolani Akinyemi
5,801 Points

Event Delegation Question

Hi, there. Has anyone tried solving this problem, I am having a hard time with it. kindly help...

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

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

Steven Parker
Steven Parker
231,008 Points
Steven Parker
Steven Parker
231,008 Points

The event target should never be an empty string, it should be a reference to the element that was clicked.

What you may want to do there is check what kind of element is is, by comparing the "tagName" property to an upper-case version of the desired tag's name.

Tolani Akinyemi
Tolani Akinyemi
5,801 Points
Tolani Akinyemi
Tolani Akinyemi
5,801 Points

Many thanks Steve, I tried the if statement again with 'input' as uppercase and it worked this time

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