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

Posted by Balakumar Chockalingam
.a{fill-rule:evenodd;}techdegree
Balakumar Chockalingam
Full Stack JavaScript Techdegree Student 11,960 Points

Can't able to clear task 1

I tried to evaluate the if condition with the input values but can't able to clear the task . Can anyone help me with a hint

There are three list items in the index.html file. We want to be able to enter a 0, 1 or 2 in the text field to embolden the list item with the corresponding index. Can you figure out what condition to put into the if statement to make this code work?

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 (true) {

           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

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

Instead of "true", you need a comparison to check if the current loop variable matches the requested item "index".

Balakumar Chockalingam
.a{fill-rule:evenodd;}techdegree
Balakumar Chockalingam
Full Stack JavaScript Techdegree Student 11,960 Points

Hi Steven

Thanks for your kind advice i tried the way which you suggested . if (law === index) then not worked . But if i used the counter if (i == index) then worked.

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

Balakumar Chockalingam — The "loop variable" I mentioned is "i". "Law" is a different variable also used inside the loop, but not the one defined in the "for" statement.

Anyway, glad I could help. You can mark a question solved by choosing a "best answer".
And happy coding!

Kelinia Johnson
Kelinia Johnson
10,189 Points

Can you help me with showing what you mean?

Sergio Andrés Herrera Velásquez
PLUS
Sergio Andrés Herrera Velásquez
Courses Plus Student 23,765 Points
Sergio Andrés Herrera Velásquez
Sergio Andrés Herrera Velásquez
Courses Plus Student 23,765 Points

Kelinia Johnson Basically, the for loop assigns an index(a position inside the loop, like [0,1,2,3,]) and when they match, which is what the if statement filters for, if the condition is true( index[0] = the value of the variable when they are run through the for loop