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

Paul Lemky
PLUS
Paul Lemky
Courses Plus Student 15,502 Points
Posted by Paul Lemky
Paul Lemky
Courses Plus Student 15,502 Points

I don't understand what is being asked of me in this question.

The question doesn't make any sense to me or what it's wanting me to do.

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 (false) {

           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

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

Your job is to replace "false" with a conditional expression.

This code has a loop that iterates the list items ("li" tags) on the page. But since the condition is always false, all of them are set to have "normal" font weight.

The challenge is for you to replace the false with an expression which will cause the list item which has been selected by the number in the text input to be made bold, but the others to be normal.

Paul Lemky
Paul Lemky
Courses Plus Student 15,502 Points
Paul Lemky
Paul Lemky
Courses Plus Student 15,502 Points

It doesn't make any sense to me in the comment where it says replace false on the line below.

Do I take out 'false' and put a test condition in there? Or am I supposed to put something on the line below?

Paul Lemky
Paul Lemky
Courses Plus Student 15,502 Points
Paul Lemky
Paul Lemky
Courses Plus Student 15,502 Points

The conditional should be if (index < 3) {}, right?

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

Yes you need an expression instead of false, but the proper expression will compare two variables and not have a number in it.