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JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM Practice Selecting Elements

Christopher Phillips
Christopher Phillips
10,061 Points

How to select child elements?

I've tried most of what I learned in this segment to pass this step but nothing is working.

Selecting the 'nav' only returns one item; Selecting 'ul' returns more than 3; Likewise with 'li' ; I've tried adding my own tags, classes, id names and then selecting those. But then I get an error regarding .length - Apparently this is meant to be done without altering the index.html file (or at least changes aren't saved)

What gives??

js/app.js
let navigationLinks = document.getElementsByClassName('navLink');
let galleryLinks;
let footerImages;
index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Nick Pettit | 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>Nick Pettit</h1>
        <h2>Designer</h2>
      </a>
      <nav>
        <ul>
          <li class="navLink"><a href="index.html" class="selected">Portfolio</a></li>
          <li class="navLink"><a href="about.html">About</a></li>
          <li class="navLink"><a href="contact.html">Contact</a></li>
        </ul>
      </nav>
    </header>
    <div id="wrapper">
      <section>
        <ul id="gallery">
          <li>
            <a href="img/numbers-01.jpg">
              <img src="img/numbers-01.jpg" alt="">
              <p>Experimentation with color and texture.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-02.jpg">
              <img src="img/numbers-02.jpg" alt="">
              <p>Playing with blending modes in Photoshop.</p>
            </a>
          </li>
        </ul>
      </section>
      <footer>
        <a href="http://twitter.com/nickrp"><img src="img/twitter-wrap.png" alt="Twitter Logo" class="social-icon"></a>
        <a href="http://facebook.com/nickpettit"><img src="img/facebook-wrap.png" alt="Facebook Logo" class="social-icon"></a>
        <p>&copy; 2016 Nick Pettit.</p>
      </footer>
    </div>
  <script src="js/app.js"></script>
  </body>
</html>

1 Answer

Hi there,

Have they told you about querySelector and querySelectorAll at this point? This should return links inside the nav element:

let navigationLinks = document.querySelectorAll('nav a');

Without querySelector, you could chain two other methods like this, though it's not as easy to read:

let navigationLinks = document.getElementsByTagName('nav')[0].getElementsByTagName('a');
Christopher Phillips
Christopher Phillips
10,061 Points

Thanks! I did remember seeing something like this let navigationLinks = document.getElementsByTagName('nav')[0] but when I tried going back a 2nd time, somehow I couldn't find it again.

And no, they didn't teach how to 'drill down' like your first method. Thanks!

No problem - I couldn't remember when exactly they teach what, so I just gave you both of them. Glad it helped!