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JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM Select a Page Element By Its ID

Posted by Travis Sly
Travis Sly
3,947 Points

Bug in my browser or is my code messed up somehow?

so over this video and the last one ive been having trouble using addEventListener and getting the color of the heading to actually change here is my code: index.html:

<!DOCTYPE html> <html> <head> <title>JavaScript and the DOM</title> <link rel="stylesheet" href="css/style.css"> </head> <body> <h1 id="myHeading">JavaScript and the DOM</h1> <p>Making a web page interactive</p> <p>Things that are purple:</p> <ul> <li>grapes</li> <li>amethyst</li> <li>lavender</li> <li>plums</li> </ul> <script src="app.js"></script> </body> </html>

app.js:

const myHeading = document.getElementById('myHeading');

myHeading.addEventListener('click', () => { myHeading.style.color = 'red'; });

ive looked it over char by char and i cant find where im messing up, any help would be greatly appreciated! thank you in advance

1 Answer

Peter Vann
Peter Vann
36,425 Points
Peter Vann
Peter Vann
36,425 Points

Hi Travis!

I ran this:

<!DOCTYPE html>
<html>
  <head>
    <title>JavaScript and the DOM</title>
    <link rel="stylesheet" href="css/style.css">
  </head>
  <body>
    <h1 id="myHeading">JavaScript and the DOM</h1>
    <p>Making a web page interactive</p>
    <p>Things that are purple:</p>
    <ul>
      <li>grapes</li>
      <li>amethyst</li>
      <li>lavender</li>
      <li>plums</li>
    </ul>

  <script>
    const myHeading = document.getElementById('myHeading');

    myHeading.addEventListener('click', () => { myHeading.style.color = 'red'; });
  </script>

  </body>
</html>

Here (replace all the code in the left pane, run it, and then click the header):

https://www.w3schools.com/js/tryit.asp?filename=tryjs_array

And it worked fine (no errors in the console).

"JavaScript and the DOM" turned red (when clicked).

The only difference is my JS code is in a script tag, not an app.js file.

Notice that since my code is at the bottom of the page, it execute after the DOM loads.

That's important (but your app.js file is in the same location, so it should work - It might just be a path issue!?!

I hope that helps.

Stay safe and happy coding!