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 DOM Scripting By Example Editing and Filtering Names Fix DOM Manipulation Code

Posted by Katriel Paige
Katriel Paige
9,260 Points

Can't make sense of what the test condition needs to be?

From what's within the if statement, I assume the test condition needs to involve variable law in some way. Do I use divs? I really don't understand what this is expecting.

app.js 
const laws = document.getElementsByTagName('li');
const indexText = document.getElementById('boldIndex');
const button = document.getElementById('embolden');

button.addEventListener('click', (e) => {
    const index = parseInt(indexText.value, 10);

    for (let i = 0; i < laws.length; i += 1) {
       let law = laws[i];

       // replace 'false' with a correct test condition on the line below
       if ( ) {

           law.style.fontWeight = 'bold';
       } else {
           law.style.fontWeight = 'normal';
       }
    }
});
index.html 
<!DOCTYPE html>
<html>
<head>
  <title>Newton's Laws</title>
</head>
<body>
  <h1>Newton's Laws of Motion</h1>
  <ul>
    <li>An object in motion tends to stay in motion, unless acted on by an outside force.</li>
    <li>Acceleration is dependent on the forces acting upon an object and the mass of the object.</li>
    <li>For every action, there is an equal and opposite reaction.</li>
  </ul>
  <input type="text" id="boldIndex">
  <button id="embolden">Embolden</button>
  <script src="app.js"></script>
</body>
</html>

1 Answer

KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,972 Points

In the challenge a user will enter an index number into the text input (selected below)

const indexText = document.getElementById('boldIndex');

and converted to an integer

const index = parseInt(indexText.value, 10);

and if it matches the index of the law (i) then the law should be emboldened. So comparing index to i should do the trick.

Katriel Paige
Katriel Paige
9,260 Points

Realized my (admittedly simple) mistake: I was writing index = i . After a cup of coffee, and looking back at this comment, I realized it was a typo and I did the accurate syntax. :P