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

Posted by Marcelo Pereira
Marcelo Pereira
12,169 Points

DOM scripting by examples, challenge task 1of 1

if statement

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 (indexText === law) {

           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

Liam Clarke
MOD
Liam Clarke
Treehouse Moderator 19,717 Points
Liam Clarke
Liam Clarke
Treehouse Moderator 19,717 Points

Hi Marcelo

You've got the right idea. In your condition, you're seeing if the indexText === laws[i], however, what you want to do is have a conditional that checks if the index value is equal to laws list number

In your condition: law is never equal to indexText, as this is what they both equal.

indexText = document.getElementById('boldIndex');
law = document.getElementsByTagName('li')[i];

What you need to do is get the value of law and the value of the indexText

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); // This is the value of indexText

    for (let i = 0; i < laws.length; i += 1) { // i is the value of the the iterable list item
       let law = laws[i];

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

Hope this makes sense

Good Luck

Marcelo Pereira
Marcelo Pereira
12,169 Points
Marcelo Pereira
Marcelo Pereira
12,169 Points

thank you for you help .