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

Posted by Phillip McDonald
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Phillip McDonald
Full Stack JavaScript Techdegree Student 4,685 Points

I am completely lost, ive tried endless combinations and nothing works, either all list items bold or none of them do

I cant figure out what test condition goes in this if statement. Ive tried all combinations of variables and event targets but all I can get is all list items to bold or none. any help would be appreciated

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

Cameron Childres
Cameron Childres
11,817 Points
Cameron Childres
Cameron Childres
11,817 Points

Hi Phillip,

You want to check if the loop index i matches the value given by the user in the text input, which they've conveniently stored for you in the variable index.

I hope this helps -- let me know if you get stuck!