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JavaScript JavaScript and the DOM Getting a Handle on the DOM Return Elements Using CSS Selectors

Posted by Gabe Orlandi
Gabe Orlandi
6,712 Points

How do you access descendants in JS?

The link recommendation in the exercise on descendant selectors sends us to a lesson on CSS descendant selectors... how is that related? Specially given that in the exercise we have no access to the CSS exercise.

So I looked it up on Stackoverflow. they recommend to use this syntax let navigationLinks = document.querySelectorAll(":scope nav > ul > li > a"); but the exercise gives error message

Any recommendation please?

app.js 
let navigationLinks = document.querySelectorAll(":scope nav > ul > li > a");
let galleryLinks;
let footerImages;
index.html 
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Treehouse Student | Designer</title>
    <link rel="stylesheet" href="css/normalize.css">
    <link href='http://fonts.googleapis.com/css?family=Changa+One|Open+Sans:400italic,700italic,400,700,800' rel='stylesheet' type='text/css'>
    <link rel="stylesheet" href="css/main.css">
    <link rel="stylesheet" href="css/responsive.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
    <header>
      <a href="index.html" id="logo">
        <h1>Treehouse Student</h1>
        <h2>Designer</h2>
      </a>
      <nav>
        <ul>
          <li><a href="#" class="selected">Work</a></li>
          <li><a href="#">About</a></li>
          <li><a href="#">Contact</a></li>
        </ul>
      </nav>
    </header>
    <div id="wrapper">
      <section>
        <ul id="gallery">
          <li>
            <a href="#">
              <img src="img/numbers-01.jpg" alt="The number 1 painted with colors and textures.">
              <p>Experimentation with color and texture.</p>
            </a>
          </li>
          <li>
            <a href="#">
              <img src="img/numbers-02.jpg" alt="The number 2 painted with various colors blended together.">
              <p>Playing with blending modes in Photoshop.</p>
            </a>
          </li>
        </ul>
      </section>
      <footer>
        <a href="https://twitter.com/treehouse"><img src="img/twitter-wrap.png" alt="Twitter Logo" class="social-icon"></a>
        <a href="https://www.facebook.com/TeamTreehouse"><img src="img/facebook-wrap.png" alt="Facebook Logo" class="social-icon"></a>
        <p>&copy; Treehouse Student.</p>
      </footer>
    </div>
    <script src="app.js"></script>
  </body>
</html>

2 Answers

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

The querySelectorAll argument uses the same syntax as a CSS selector, so the information about CSS selectors would apply here also.

And a > symbol is used for direct parent-child relationships, but a descendant selector is created by separating the terms with only a space.

Also, the example you looked up is obviously for a much more complicated situation. In this challenge, you'll only need two terms for the selector in each task.

Sandra Gufler
Sandra Gufler
6,410 Points

I have the same problem over here. And I tried it now for like 20 mins. Could you maybe get a little more specific?

That would help me a lot!

1000 times "Thank you!"

Gabe Orlandi
Gabe Orlandi
6,712 Points

Thanks feedback most appreciated!

PS: I noticed that either there is a lag or some server-side response issue with the exercises. I've experienced this at least 4 times: the code is entered correctly but an error is displayed. If the page is refreshed and the code entered again (and i really mean it, just a copy paste of the code written before the page refresh ) then a correct answer message appears. (Im (Im on Chrome Version 99.0.4844.83 so i doubt its a browser issue).

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

You might want to report technical issues directly to the staff. See the instructions on the Support page,

Sandra Gufler
Sandra Gufler
6,410 Points
Sandra Gufler
Sandra Gufler
6,410 Points

Thank you!!!