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

dan cheng
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dan cheng
Full Stack JavaScript Techdegree Student 11,596 Points
Posted by dan cheng
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dan cheng
Full Stack JavaScript Techdegree Student 11,596 Points

why the text in tag p doesnt get highlighted?

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

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

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

list.addEventListener('click', function(e) {
  if (e.target.tagName == 'BUTTON') {
     let paragraph = e.target.previousElementSibling;
     paragraph.style.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>

1 Answer

james south
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james south
Front End Web Development Techdegree Graduate 33,271 Points
james south
.a{fill-rule:evenodd;}techdegree seal-36
james south
Front End Web Development Techdegree Graduate 33,271 Points

className is not a CSS property and thus is not used with element.style.... syntax. it is manipulating the class attribute and therefore you call it on the element itself, myElement.className = .....

https://developer.mozilla.org/en-US/docs/Web/API/Element/className