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

Calvin Luo
Calvin Luo
Full Stack JavaScript Techdegree Student 11,467 Points

There are three list items in the index.html file. We want to be able to enter a 0, 1 or 2 in the text field to embolden

I'm not sure if I understand the question correctly. what I wrote is working in the preview but the answer is wrong.

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 (index===0 || index===1 || index===2) {

           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

Sharon Hartsell
Sharon Hartsell
4,402 Points

Hi Calvin! It looks like this challenge is asking to only make one of the laws bold, based on the index the user types into the input field. So if the user types in 0, the first law should be bold. If the user types in 1, the second law should be bold, etc.

The condition you currently have makes all the laws bold:

if (index===0 || index===1 || index===2) { // always true when user types in 0, 1, or 2
  law.style.fontWeight = 'bold';

Instead, try comparing the index the user entered with the index for the law you're looping over (i) like this:

if (i === index) {
  law.style.fontWeight = 'bold';

Hope this helps.