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

Posted by Travis Sly
Travis Sly
3,947 Points

Im so lost after this section

Sorry for the repost, I had a question about challenge 1/3 in this module.

But once again im noticing at the end of all 3 of these challenges im TOTALLY lost.. lol

Am i missing a different section or video or topic that ties into this concept, or am i just missing things in this section and need to rewatch?

Also on another topic does anyone have any recommendations as far as solidifying the topics into memory? taking notes on paper? any other websites that have really good plentiful practice problems, or is there a section teamtreehouse has on more practice?

I know everyone says to start building projects and I'm so new and have always not been the most creative so i dont even know where to begin. I have an idea for a project that i want to work on, but i have no where near the knowledge to bring it to fruition just yet and i fear by the time i work my way through the full stack JS track i will forget what i learned initially.

js/app.js 
let navigationLinks = document.querySelectorAll("nav a");
let galleryLinks = document.querySelectorAll("#gallery a");
let footerImages document.quesry
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><a href="index.html" class="selected">Portfolio</a></li>
          <li><a href="about.html">About</a></li>
          <li><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

Peter Vann
Peter Vann
36,427 Points
Peter Vann
Peter Vann
36,427 Points

This code passes all three:

let navigationLinks = document.querySelectorAll('nav a');
let galleryLinks = document.querySelectorAll('#gallery a');
let footerImages = document.querySelectorAll('footer img');

By way of explanation, 'nav a' is a descendant selector. "document.querySelectorAll('nav a');" basically says, "SELECT ALL links that are descendants (or nested within) the 'nav' element". Likewise for the other two lines of code.

Keep in. mind, with document.getElementById, you don't add the '#' nor with document.getElementsByClassName do you add the '.', but with querySelector and querySelectorAll, you do need to add them.

For testing, and experimenting with HTML./JS code, I use this page all the time - it's convenient: https://www.w3schools.com/js/tryit.asp?filename=tryjs_array (You can experiment on CodePen, too)

I just swap out the code with my current objective, but still use document.getElementById("demo").innerHTML = [myCodeDisplayableResult]; to display the result.

One helpful video: https://www.youtube.com/watch?v=b8fq50UauAQ

Travis Sly
Travis Sly
3,947 Points

Awesome thank you. I must have missed the section on descendant selectors, I'll do some more research!