Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

Nebojsa Stevanovic
seal-mask
.a{fill-rule:evenodd;}techdegree
Nebojsa Stevanovic
Full Stack JavaScript Techdegree Student 9,620 Points

i don't think that i understand what i need to do here...

i don't think that i understand what i need to do here...

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.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>

5 Answers

The goal is to "embolden the list item with the corresponding index"

The index entered by the user is provided as:

const index = parseInt(indexText.value, 10);

After this the list items are looped through using index i

So if i matches the index entered by the user the list item should be emboldened.

Close. laws[i] is an element. You want to use the index of that element which is just i

Also you need a comparison operator instead of the assignment operator.

Nebojsa Stevanovic
seal-mask
.a{fill-rule:evenodd;}techdegree
Nebojsa Stevanovic
Full Stack JavaScript Techdegree Student 9,620 Points

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 (index= laws[i]) {

       law.style.fontWeight = 'bold';
   } else {
       law.style.fontWeight = 'normal';
   }
}

});

i am close ??

Nebojsa Stevanovic
seal-mask
.a{fill-rule:evenodd;}techdegree
Nebojsa Stevanovic
Full Stack JavaScript Techdegree Student 9,620 Points

omg.. i got it finally.. ```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 (index===i) {

       law.style.fontWeight = 'bold';
   } else {
       law.style.fontWeight = 'normal';
   }
}

});``` thank youu

Yeah. It's one of those challenges that once you see it you are surprised at how much easier it is than you originally thought.