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

Posted by koen haentjens
koen haentjens
7,343 Points

code challange js selecting elements

Challenge Task 1 of 3 In this challenge, you're going to select various elements from index.html. First, select all <a> elements inside the <nav> element and assign them to the variable navigationLinks. (HINT: Use a descendant selector to match elements that are descendants of an element.)

Bummer: Make sure that you're selecting 3 links. It looks like you've selected 1 links. app.js index.html

let navigationLinks; let galleryLinks; let footerImages; ā€‹ navigationLinks = document.getElementsByTagName("nav");

ā€‹

app.js 
let navigationLinks;
let galleryLinks;
let footerImages;

navigationLinks = document.getElementsByTagName("nav");
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>

3 Answers

koen haentjens
koen haentjens
7,343 Points

yes but need to select all <a> within <nav> and i can't do it

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

That's where the descendant selector comes in. As I said, it has two terms, the container and the target, separated by a space. So, for example, all images in a header would be "header img". And you can't do complex selectors like this with getElementsByTagName, which is why I suggested using a different function.

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

The message is slightly misleading ā€” you haven't seledted a link, you've selected the <nav> element.

A few additional hints:

  • links are implemented using anchor ("a") elements
  • a descendant selector has two terms, the container and the target, separated by a space
  • you'll need a different selector function for this kind of selector (try querySelectorAll)
koen haentjens
koen haentjens
7,343 Points
koen haentjens
koen haentjens
7,343 Points

thank you for your time