Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Ian Olson
Ian Olson
2,204 Points
Posted by Ian Olson
Ian Olson
2,204 Points

Scope too narrow?

Not sure if I should be using the event or the i variable because either way it either boldens everything or nothing.

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 (event.textInput === 0,1,2) {

           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

Emmanuel C
Emmanuel C
10,636 Points
Emmanuel C
Emmanuel C
10,636 Points

You can just use the "i", event.textinput isnt defined, but the number being passed in is already in the index variable.

if(i === index)
Daniel Baker
Daniel Baker
15,369 Points
Daniel Baker
Daniel Baker
15,369 Points

Ian,

1) The event is designated 'e' on line 5, not 'event'. (But this isn't needed for the answer)

2) The button was clicked that created the even so e.textInput would be pulling information from the button not the input box.

3) The input box was put into a variable already on line 2

const indexText = document.getElementById('boldIndex');

4) You are in a loop, so you can use the i variable instead of 0,1,2 on line 12

5) So check to see if indexText is equal to the index of the loop.

Answer

 if (indexText === i) {