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

Olive Bamurange
Olive Bamurange
5,174 Points
Posted by Olive Bamurange
Olive Bamurange
5,174 Points

Hi there, could someone help to understand this question. I will appreciate your help.

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.

js/app.js 
var listItems;
var listItems = document.getElementsByTagName('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>

2 Answers

Steven Parker
Steven Parker
229,657 Points
Steven Parker
Steven Parker
229,657 Points

You've got the right idea, but "rainbow" is not a tag name, so you can't use it with "getElementsByTagName". Also, that's the ID of the list itself, but you want to select the list items inside of it. So a method that would allow a more complex descendant selector would be ideal.

And you only want to declare a variable once (so only one line should have "var listItems"):

var listItems = document.querySelectorAll('#rainbow li');