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

Mark Repass
Mark Repass
10,346 Points

A little confused.

I know it needs to be a condition but I am having trouble understanding what they want. I tried putting in index which works sort of when you preview and try typing in a number it emboldens everything.

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 (index) {

           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>

2 Answers

Rohald van Merode
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Rohald van Merode
Treehouse Staff

Hi Mark Repass,

Great question! You'll want to adjust the conditional on line 12 of the JavaScript file. In there you'll want to check if the index (the number the user entered in the input field) is equal to the i which is the current iteration of the loop. Changing to condition like so should get your code working:

if (index === i) {
    law.style.fontWeight = 'bold';
} else {
    law.style.fontWeight = 'normal';
}
Mark Repass
Mark Repass
10,346 Points

That makes so much more sense now. Thanks for showing me the way.