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JavaScript

Posted by Rami Saleh Alsayed
.a{fill-rule:evenodd;}techdegree seal-36
Rami Saleh Alsayed
Front End Web Development Techdegree Graduate 13,484 Points

Sorry I don't understand why Guil use 'previousElementSibling' to store the nested div , please help . 

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link href="https://fonts.googleapis.com/css?family=Courgette" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Lato:400,700" rel="stylesheet">
    <title>Traversing the DOM</title>
    <link rel="stylesheet" href="css/style.css">
  </head>
  <body>
    <div class="wrapper">
      <h1>Color Palette:</h1>
      <div></div>
      <ul class="list">
        <li>
          <span>Robin's Egg Blue</span>
          #04c5e6
        </li>
        <li>
          <span>Geyser</span>
          #b7c7d0
        </li>
        <li>
          <span>Jaffa</span>
          #f36f49
        </li>
        <li>
          <span>Shamrock</span>
          #57d6ab
        </li>
      </ul>
    </div>
    <script src="js/scripts.js"></script>
  </body>
</html>

// 5: Store the nested div in a variable named `banner`
const banner = list.previousElementSibling;

banner.className = 'banner';

1 Answer

Steven Parker
Steven Parker
229,744 Points
Steven Parker
Steven Parker
229,744 Points

The whole point of traversal is to get references to elements starting with a reference to another element. In this case, you start with the list (ul) element, and get to the div element just before it:

      <div></div>         <!-- this is the "previousElementSibling" of the list -->
      <ul class="list">   <!-- this is the "list" you start with -->
Rami Saleh Alsayed
.a{fill-rule:evenodd;}techdegree seal-36
Rami Saleh Alsayed
Front End Web Development Techdegree Graduate 13,484 Points

Thank you so much Steven .