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

Edmundo Ruiz
Edmundo Ruiz
3,488 Points

Can't seem to find the condition

Ok, so I can see the selectors, and how we use indexText insode the parseInt of the function to get the value of the input.

I see how law uses the for loop in the index of the selector laws to grab all the list items.

I have tried the same thing inside the condition (law[index]) to see if that will use the input to select a specific li.

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';
<!DOCTYPE html>
  <title>Newton's Laws</title>
  <h1>Newton's Laws of Motion</h1>
    <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>
  <input type="text" id="boldIndex">
  <button id="embolden">Embolden</button>
  <script src="app.js"></script>

1 Answer

If you enter 0 into the input field, it should make bold the first law, or laws[0].

If you enter 1, it should make bold laws[1].

If you enter 2, it should make bold laws[2].

So what two variables do you need to compare in the if clause? And what operator do you use to see if two values are equal?

Hint: you declare the variables just inside the function.