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

Juan Diaz
Juan Diaz
7,661 Points

I can't get this event to work properly. Please help!

I'm trying to fire the event ONLY when the '<input type="text"> ' elements inside of the <section> are clicked on so they change color (r,g,b).

I've tried the following. Selecting the ul first. Then, e.target.nodeName to check if the node that was clicked on is an input, but that won't work.

It may be simpler than I think it is, but I can't grasp what's going on under the hood.

Any suggestions would be of great help. Thank you!

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) => {
  let ul = document.getElementsByTagName('ul')[0];
  if( e.target.nodeName == 'input'){
      e.target.style.backgroundColor = 'rgb(255, 255, 0)';
  }
});

1 Answer

Steven Parker
Steven Parker
229,732 Points

You're pretty close, but:

  • the property that indicates the type of element is "tagName"
  • tag names are always stored in all uppercase
Juan Diaz
Juan Diaz
7,661 Points

WOW! Excellent! thanks a lot. You were right all along!