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

Posted by Paul Messmer
Paul Messmer
15,023 Points

I dont know what I am missing

This is the error I keep getting

There was an error with your code: TypeError: 'undefined' is not an object (evaluating 'listItems[i].style')

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

for(var i = 0; i < colors.length; i +=1) {
  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

Dimitar Dimitrov
Dimitar Dimitrov
11,800 Points
Dimitar Dimitrov
Dimitar Dimitrov
11,800 Points

In your selection you need to select the items in the ul not the list. So we need to select the list items in the ul with ID of "rainbow".

var listItems = document.querySelectorAll("#rainbow li")
var colors = ["#C2272D", "#F8931F", "#FFFF01", "#009245", "#0193D9", "#0C04ED", "#612F90"];

for(var i = 0; i < colors.length; i ++) {
  listItems[i].style.color = colors[i];    
}
Paul Messmer
Paul Messmer
15,023 Points

Thank you very much!