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

Posted by Daniel Guy
Daniel Guy
15,305 Points

I can't figure this out...

I've tried (law === index) and tested for other strict equalities but not of them work. Help!

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 === 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>

1 Answer

Victor Mercier
Victor Mercier
14,667 Points

Hi, here is how your code looks (the condition), because if you compare a dom element to a number, you will always get false, so you need to make the index, which is the input value, is equal to the current i value. if (index == i) {

       law.style.fontWeight = 'bold';
   } else {
       law.style.fontWeight = 'normal';
   }

If that helped you, please mark as best answer to indicates other students your issue is resolved!