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

Christian van Lierop
Christian van Lierop
13,758 Points

I have no idea what the real question is, hidden in this puzzle...

"There are three list items in the index.html file. We want to be able to enter a 0, 1 or 2 in the text field to embolden the list item with the corresponding index. Can you figure out what condition to put into the if statement to make this code work?"

What does "embolden the list item with the corresponding index" actually mean. English is not my native language, and this sounds more like a riddel than a question to me...

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.value >= 1) {

           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
229,921 Points

The word "embolden" means "make it be bold", and the code to do that is already provided. Your task is just to set the conditional expression so it happens to the right item.

And the "item with the corresponding index" is the one that has the same index number as the number that the user put into the input box. To help you do this, the index box value has already been converted into a number and stored in the variable "index" a few lines above.