Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM (Retiring) Making Changes to the DOM Removing Nodes

Harrison Greeves
Harrison Greeves
2,920 Points
Posted by Harrison Greeves
Harrison Greeves
2,920 Points

My remove button won't remove the added item

<!DOCTYPE html>
<html>
  <head>
    <title>JavaScript and the DOM</title>
    <link rel="stylesheet" href="css/style.css">
  </head>
  <body>
    <h1 id="myHeading">JavaScript and the DOM</h1>
    <p>Making a web page interactive</p> 
    <button id = "toggleList">Hide list</button>
    <div class = "list">
      <p class = "description">Things that are purple:</p>
      <input type = "text" class = "description">
      <button class = "description">Change list</button>
      <ul>
        <li>grapes</li>
        <li>amethyst</li>
        <li>lavender</li>
        <li>plums</li>
      </ul>
      <input type = "text" class = "addItemInput">
      <button class = "addItemButton">Add item</button>
      <button class = "removeItemButton">Remove last item</button>
    </div>
    <script src="app.js"></script>
  </body>
</html>

const toggleList = document.getElementById("toggleList"); 
const listDiv = document.querySelector(".list"); 
const descriptionInput = document.querySelector("input.description");
const descriptionP = document.querySelector("p.description");
const descriptionButton = document.querySelector("button.description");
const addItemInput = document.querySelector("input.addItemInput");
const addItemButton = document.querySelector("button.addItemButton");
const removeItemButton = document.querySelector("button.removeItemButton");

toggleList.addEventListener("click", () => {
  if (listDiv.style.display == "none") {
    toggleList.textContent = "Hide list";
    listDiv.style.display = "block";
  } else {
    toggleList.textContent = "Show list"; 
    listDiv.style.display = "none";
  } 
});

descriptionButton.addEventListener("click", () => {
      descriptionP.innerHTML = descriptionInput.value + ":";
      descriptionInput.value = " ";                            
});

addItemButton.addEventListener("click", () => {
   let ul = document.getElementsByTagName("ul")[0]; 
   let li = document.createElement("li"); 
   li.textContent = addItemInput.value;
   ul.appendChild(li); 
   addItemInput.value = " ";
});

removeItemButton.addEventListener("click", () => {
   let ul = document.getElementsByTagName("ul")[0]; 
   let li = document.querySelector("li: last-child"); 
   ul.removeChild(li); 
});

1 Answer

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

There's a stray space between the colon and the identifier of a pseudo-element selector near the end of the script:

   let li = document.querySelector("li: last-child");   // original
   let li = document.querySelector("li:last-child");    // fixed