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

SAMUEL LAWRENCE
PLUS
SAMUEL LAWRENCE
Courses Plus Student 8,447 Points
Posted by SAMUEL LAWRENCE
SAMUEL LAWRENCE
Courses Plus Student 8,447 Points

Help with code challenge.

Hi guys I'm stuck on this fix DOM manipulation code. can't figure it out. Steven Parker

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 (laws.indexOf(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>

2 Answers

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

The answer is quite simple if you know what values you're checking.

In the code you're creating two variables you want to check your condition against.

You have i which is created in your for loop and you have index which you use to store the value that you capture in parseInt.

What you're checking for is that these values are the same, so use the equality operator in your test condition.

Good luck! :-)

SAMUEL LAWRENCE
SAMUEL LAWRENCE
Courses Plus Student 8,447 Points
SAMUEL LAWRENCE
SAMUEL LAWRENCE
Courses Plus Student 8,447 Points

Got the answer. I swear at some point I did that, I'm sure there was a typo and it didn't parse cause I was really annoyed so I was typing fast couldn't figure out why it wasn't working. hahahaha. 3 days, man 3 days. hahahaha.

Thank you

Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

Never mind, I'm glad you got there in the end. All a learning experience! :)

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

:bell: I was alerted by your tag, but it looks like Jonathan already has you covered. Happy coding!