Why can't I select by tag name "button" if button is a tag name?

Question

Not sure what to do here. Trying to select the buttons to get to the previous element sibling.

app.js

const list = document.getElementsByTagName('ul')[0];

list.addEventListener('click', function(e) {
  if (e.target.tagName == 'BUTTON') {
    let prevP = button.previousElementSibling;
    prevP.className = 'highlight';
  }
});

index.html

<!DOCTYPE html>
<html>
    <head>
        <title>JavaScript and the DOM</title>
    </head>
    <link rel="stylesheet" href="style.css" />
    <body>
        <section>
            <h1>Making a Webpage Interactive</h1>
            <p>Things to Learn</p>
            <ul>
                <li><p>Element Selection</p><button>Highlight</button></li>
                <li><p>Events</p><button>Highlight</button></li>
                <li><p>Event Listening</p><button>Highlight</button></li>
                <li><p>DOM Traversal</p><button>Highlight</button></li>
            </ul>
        </section>
        <script src="app.js"></script>
    </body>
</html>

Answer 1 · 2018-01-30T09:06:51Z

January 30, 2018 9:06am

You are assigning prevP to a variable called button that doesn't exist. e.target holds your button.

Answer 2 · 2018-01-30T09:24:18Z

January 30, 2018 9:24am

You know what? That's so clear to me now. I think I should have gone to bed long ago. Thanks.

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April Nichols

April Nichols

Why can't I select by tag name "button" if button is a tag name?

2 Answers

Pedro Cabral

Pedro Cabral

April Nichols

April Nichols