Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript

Hi, why my button is not working?

Hello, I want the button with the class "show-button" tho show the list with the class "listDiv". What I did wrong in my app.js file? Here are all the files: The HTML file:

<!DOCTYPE html>
<html lang="pl" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>To Do App</title>
    <link rel="stylesheet" href="css/normalize.css">
    <link href="https://fonts.googleapis.com/css?family=Open+Sans&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="css/basic.css">
  </head>
  <body>
    <div class="container">
      <h1>To Do App</h1>
      <p>The best app to organize your time</p>
      <button type="button" class="show-button">Show list</button>
      <div class="listDiv">
        <p>The things you need to do today:</p>
        <ul>
          <li>Make your bed</li>
          <li>Eat breakfast</li>
          <li>Be happy all day long</li>
        </ul>
      </div> <!-- /listDiv -->
    </div> <!-- /container -->

    <script src="app.js"></script>
  </body>
</html>

The JavaScript file:

const container = document.querySelector(".container");
const showButton = document.querySelector(".show-button");
const listDiv = document.querySelector(".listDiv");


container.addEventListener('click', (event) => {
  if (event.target.className === ".show-button") {
    if ( event.target.textContent === "Show list" ) {
      listDiv.style.display = "block";
    }
  }
});

The CSS file:

.listDiv {
  display: none;
}

1 Answer

The class name here is just the name:

if (event.target.className === ".show-button")

No need to begin with a period.

Ok, thank you. One more question, when I did something like this:

container.addEventListener('click', (event) => {
  if ( event.target.className == "show-button" ) {
    if ( listDiv.style.display == "none" ) {
      listDiv.style.display = "block";
      showButton.textContent = "Hide list";
    } else {
      listDiv.style.display = "none";
      showButton.textContent = "Show list";
    }
  }
});

It is also not working, can you tell me why?