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

Tyler Coquillard
Tyler Coquillard
8,660 Points
Posted by Tyler Coquillard
Tyler Coquillard
8,660 Points

I can't figure out this solution.

Hey all,

I think I understand what I need to do here, but cannot figure it out. I know it has to do with whether using the user's input on the indexText element to select the 'li' position in the laws[i] array, but I can't seem to figure it out.

Thanks

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[i] ) {

           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

Jon Foose
Jon Foose
4,763 Points
Jon Foose
Jon Foose
4,763 Points

Hey Tyler,

In your if statement, you want to check the input value against the loop index.

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 (i === index) {

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

});