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

Posted by Tani Huang
Tani Huang
6,952 Points

About keydown,

A wrap contain keys and audios

<div class="wrap">  
 //key 
 <div class="keys">  
  <div data-key="65" class="key">  
  <kbd>A</kbd>  
  <span class="sound">clap</span>  
 </div>  
 <div data-key="83" class="key">  
  <kbd>S</kbd>  
  <span class="sound">hihat</span>  
  </div>  
 </div>  
 //audio
 <audio data-key="65" src="sounds/clap.wav"></audio>  
 <audio data-key="83" src="sounds/hihat.wav"></audio>  
</div>

A. work fine

window.addEventListener ('keydown', function(e) {
    console.log(e);
});

B. it wont show anything...is it error ?

var wrap = document.querySelector ('.wrap');
wrap.addEventListener ('keydown', function(e) {
    console.log(e);
});

1 Answer

Robert Anthony
Robert Anthony
19,952 Points
Robert Anthony
Robert Anthony
19,952 Points

I think the reason it isn't working is that the keydown event for an element will only trigger IF the element has the focus. So an input field with the cursor in it would trigger that element's keydown event but would not trigger a different element's keydown event.

In your case, the focus would have to be inside the .wrap div for the keydown to work but there is nothing inside the div which can take the focus.

However, the document keydown event will always trigger. If there is not a good reason for the event to be on the element, I would attach it to the document.