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JavaScript

Posted by Christopher Sukovich
Christopher Sukovich
13,382 Points

Javascript Foundations / Variables / Basics: Code Challenge

Challenge 1 of 3: Move the script tag where it'll get executed after the page loads.

<!DOCTYPE html>
<html lang="en">
  <head>
    <title> JavaScript Foundations: Variables</title>
    <style>
      html {
        background: #FAFAFA;
        font-family: sans-serif;
      }
    </style>
    <script src="myscript.js"></script>
  </head>
  <body>
    <h1 id="title">JavaScript Foundations</h1>
    <h2>Variables: Basics</h2>
    <div id="container">
      This is a div with the id of "container"
    </div>
  </body>
</html>

I'm assuming all I need to do is move the <script> tag to the bottom of the body, just before it closes, but when I do, I receive this error:

Bummer! There was an error with your code: TypeError: 'null' is not an object (evaluating 'container.style')

Here is the example js:

/* JavaScript Foundations: Variables */

var bgColor = "";
var textColor = "";

var container = document.getElementById('title');
container.style.background = bgColor;
container.style.color = textColor;

Is there an error in the example code?

Twiz T
Twiz T
12,588 Points

I think you need to move the script before the closing body tag

Christopher Sukovich
Christopher Sukovich
13,382 Points

Twiz T - That's what I did, but I just wanted to provide the example code as is - the error pops up anyway, and I'm thinking it's something in the example js.

Twiz T
Twiz T
12,588 Points

ahh thanks for fixing the formatting. It doesn't look like bgColor and textColor variables are being set to anything which explains the error.

But yeah you're right if thats how the challenge engine was loaded is seems to be a mistake; maybe just fill in colors for the 2 variables for the sake of passing the first task and submit a ticket to treehouse saying the example.js was being loaded without any values for those 2 variables.

Christopher Sukovich
Christopher Sukovich
13,382 Points

Thanks Twiz T ! Still getting the error, unfortunately - even with variables filled in.

Jim Hoskins , any ideas?

Twiz T
Twiz T
12,588 Points

Sounds like a bug. I just went to that challenge and this worked for me. 

<!DOCTYPE html>
<html lang="en">
  <head>
    <title> JavaScript Foundations: Variables</title>
    <style>
      html {
        background: #FAFAFA;
        font-family: sans-serif;
      }
    </style>

  </head>
  <body>
    <h1 id="title">JavaScript Foundations</h1>
    <h2>Variables: Basics</h2>

    <div id="container">
      This is a div with the id of "container"
    </div>
    <script src="myscript.js"></script>
  </body>
</html>

and the myscript.js file

/* JavaScript Foundations: Variables */

var bgColor = "";
var textColor = "";

var container = document.getElementById('title');
container.style.background = bgColor;
container.style.color = textColor;

Try reloading the challenge in a different browser session?

3 Answers

Christopher Sukovich
Christopher Sukovich
13,382 Points

Twiz T it ended up being a browser issue with Safari - works in Chrome, thanks!

Jason Anello
PLUS
Jason Anello
Courses Plus Student 94,610 Points
Jason Anello
Jason Anello
Courses Plus Student 94,610 Points

Hi Christopher,

For task 1 you should not be doing anything yet with the js file.

The challenge wants you to simply move the script tag which loads the js file, <script src="myscript.js"></script>, from the head section to right before the closing body tag </body>

<script src="myscript.js"></script>
  </body>
</html>
Jason Anello
Jason Anello
Courses Plus Student 94,610 Points

Did you by chance put it there but also left it in the head section? That does produce the error you're getting. If you have it in both places.

Twiz T
Twiz T
12,588 Points
Twiz T
Twiz T
12,588 Points

Gah of all the things to have to think about!