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

Owen Osagiede
Owen Osagiede
2,862 Points

Cant seem, to figure out the conditional to get laws to turn bold.

I know the index is equal to what the user has put into the text box, and that law is equal to each individual li element. Therefore I though that:

If index (user input) = law (0, 1, or 2) then law will be boldened.

Im not sure where I went wrong.

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>
Trent Ungard
Trent Ungard
10,533 Points

Hello!

It looks as though what you're trying to do is take an index value as an input from your field, and take the item matching that index value in your list and make it bold. Hopefully, I'm understanding.

In your code, you loop through your array and check if the law is equal to the index in the text field. The index is expected to be a number, and the law is a string (law == index). These two items will not be equivalent. Instead, you can run this code which essentially just takes a number from the field, and if there is an item matching that index in your list, it will make it bold.

const laws = document.getElementsByTagName('li'); const indexText = document.getElementById('boldIndex'); const button = document.getElementById('embolden');

button.addEventListener('click', () => { const index = indexText.value; laws[index].style.fontWeight = 'bold'; });

There are other ways to go about this also, but this was the quickest solution I came up with. Hope this fixes your problem!

1 Answer

Cody Norman
seal-mask
.a{fill-rule:evenodd;}techdegree
Cody Norman
Full Stack JavaScript Techdegree Student 3,421 Points

Did you ever get this figured out? I've spent WAY to much time working on this but i can't figure it out! In my head I know what needs done but I'm still struggling to get the code to work.