Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Posted by Lauren Sithole Gadyadza
Lauren Sithole Gadyadza
6,659 Points

challenge selecting multiple elements

Challenge Task 1 of 1 The for loop cycles over list items and applies a color to each item using the values stored in the colors array. For example, the first color in the array ( #C2272D) is applied to the first list item, the second color (#F8931F) to the second list item, and so on. Complete the code by setting the variable listItems to refer to a collection. The collection should contain all list items in the <ul> element with the ID of rainbow.

Bummer: There was an error with your code: ReferenceError: Can't find variable: getElementByClassName
js/app.js index.html var listItems = getElementByClassName('rainbow'); var colors = ["#C2272D", "#F8931F", "#FFFF01", "#009245", "#0193D9", "#0C04ED", "#612F90"]; ā€‹ for(var i = 0; i < colors.length; i ++) { listItems[i].style.color = colors[i];
}

js/app.js 
var listItems = getElementByClassName('rainbow');
var colors = ["#C2272D", "#F8931F", "#FFFF01", "#009245", "#0193D9", "#0C04ED", "#612F90"];

for(var i = 0; i < colors.length; i ++) {
  listItems[i].style.color = colors[i];    
}
index.html 
<!DOCTYPE html>
<html>
  <head>
    <title>Rainbow!</title>
  </head>
  <body>
    <ul id="rainbow">
      <li>This should be red</li>
      <li>This should be orange</li>
      <li>This should be yellow</li>
      <li>This should be green</li>
      <li>This should be blue</li>
      <li>This should be indigo</li>
      <li>This should be violet</li>
    </ul>
    <script src="js/app.js"></script>
  </body>
</html>

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

There isn't any function named "getElementByClassName" that would return a single element, but there is a "document.getElementsByClassName" (plural) that returns an element collection.

But you don't need to use that here anyway, since "rainbow" is not a class name but an ID. Keep in mind that it's also the ID of the parent element of the ones you want.