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JavaScript JavaScript and the DOM (Retiring) Traversing the DOM Child Traversal

Posted by jose de Lima
jose de Lima
4,722 Points

Bug in Javascript and the Dom final assessment

Code written: const section = document.querySelector('section'); const paragraphs = section.children; for (let i = 0; i <= paragraphs.length; i++) { paragraphs[i].style.color = 'blue'; }

Question is to change all paragraph elements on the page to blue, which this code does but keep getting error saying previous task 1 no longer working. I used children because it specified me to use it.

app.js 
const section = document.querySelector('section');
const paragraphs = section.children;
for (let i = 0; i <= paragraphs.length; i++) {
  paragraphs[i].style.color = 'blue'; 
}
index.html 
<!DOCTYPE html>
<html>
    <head>
        <title>Child Traversal</title>
    </head>
    <body>
        <section>
            <p>This is the first paragraph</p>
            <p>This is a slightly longer, second paragraph</p>
            <p>Shorter, last paragraph</p>
        </section>
        <footer>
            <p>&copy; 2016</p> 
        </footer>
        <script src="app.js"></script>
    </body>
</html>

1 Answer

Calin Bogdan
Calin Bogdan
14,921 Points

Hello!

The main issue is that the for statement should start from 0 and end before the length of the paragraphs array. Your loop currently iterates over the 3 paragraph elements, then raises an error once it gets to i = 3 and doesn't find a paragraph. The loop condition should be 

i < paragraphs.length

not

i <= paragraphs.length

Hope it helped!

jose de Lima
jose de Lima
4,722 Points

facePalm, thx