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

Posted by Zak Mosbacher
.a{fill-rule:evenodd;}techdegree seal-36
Zak Mosbacher
Full Stack JavaScript Techdegree Graduate 16,080 Points

I think im having a mind blank or something but i still cant figure this out

Please help me if you can, thanks :D

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];
       let li = parseInt(law.text);
       // replace 'false' with a correct test condition on the line below
       if (li === 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

Lola Jahn
Lola Jahn
18,718 Points
Lola Jahn
Lola Jahn
18,718 Points

You don't need to get anything extra, you have all the information you need already. I don't think my solution is the best one, but it gets the job done.

I simply swapped "false" with a statement where I compare law to laws[index -1]. The reason I'm inserting -1 is that the for loop starts at 0 and the numbers you insert into the input field is 1,2,3. 

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 == laws[index-1]) {
           law.style.fontWeight = 'bold';
       } else {
           law.style.fontWeight = 'normal';
       }
    }
});

Hope this helped!