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

Posted by debasis nath
debasis nath
11,650 Points

Fix Dom Manipulation ? not getting the point what to test here ?

not getting the point what to test 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) {

           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>

3 Answers

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

The user puts the index number of the item to be highlighted in the text box. The code already converts it into a number and stores it in the "index" variable. So inside the loop, you would compare that value with the loop variable.

debasis nath
debasis nath
11,650 Points
debasis nath
debasis nath
11,650 Points

Bummer! It looks like you didn't update the test condition of the if statement correctly . If I do test this if(law === index)

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

But "law" is one of the elements. The loop variable is "i".

debasis nath
debasis nath
11,650 Points
debasis nath
debasis nath
11,650 Points

How stupid I'm, from last two days I could not figure out that, Thanks helping me out.

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

Everyone gets stuck now and then, it's all part of the learning process. Glad I could help.

Happy coding!