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) Getting a Handle on the DOM Selecting by Id

Posted by Matthew Hung
Matthew Hung
3,066 Points

Selected by Id

the question is 'There is a variable named button in app.js. Set its value to contain a reference to the button element in index.html with the ID of sayPhrase.' I am not sure what to do.

js/app.js 
let button;
let input;

button.addEventListener('click', () => {
  alert(input.value);
});
index.html 
<!DOCTYPE html>
<html>
  <head>
    <title>Phrase Sayer</title>
  </head>
  <body>
    <p><input type="text" id="phraseText"></p>
    <p><button id="sayPhrase">Say Phrase</button></p>
    <script src="js/app.js"></script>
  </body>
</html>

1 Answer

Michael Davis
PLUS
Michael Davis
Courses Plus Student 12,508 Points
Michael Davis
Michael Davis
Courses Plus Student 12,508 Points

In this lecture, at time-stamp of 0:38 (38-seconds), Guil goes over how to select an item by its ID. That is what this question is asking you to do.

Locate the element with the ID of sayPhrase and assign it to the variable button.