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JavaScript JavaScript and the DOM (Retiring) Making Changes to the DOM Styling Elements

Posted by Alex Ng
Alex Ng
11,245 Points

unexpected output of toggle button...

Hi,

It would appear the code is written properly, but when the hide list button is pressed it writes a semi-colon to the display style which causes the if statement not to recognize the result.

Here's the

 <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 description</button>
      <ul>
        <li>grapes</li>
        <li>amethyst</li>
        <li>lavender</li>
        <li>plums</li>
      </ul>
    </div>

my JS

const toggleList = document.getElementById('toggleList');
const listDiv = document.querySelector('.list');
const input = document.querySelector('input');
const p = document.querySelector('p.description');
const button = document.querySelector('button.description');

toggleList.addEventListener('click', () => {

                            if (listDiv.style.dispay == 'none') {
                              toggleList.textContent = 'Hide list';
                              listDiv.style.display = 'block';
                            } else {
                              toggleList.textContent = 'Show list';
                              listDiv.style.display = 'none';
                            }
});

Now here's the html on the preview before the button is pressed:

<button id="toggleList" >Hide List</button>
     <div class="list">...</div>

and after

<button id="toggleList" >Show list</button>
     <div class="list" style="display: none;">ā€¦</div>

the ';' just gets added after 'none' and I don't know why, but it's causing the conditional that would should show the text not to be true.

1 Answer

KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,971 Points
KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,971 Points

You have a misspelling. dispay should be display here:

if (listDiv.style.dispay == 'none') {
Alex Ng
Alex Ng
11,245 Points

Ah, well there we go. Thanks! Why wouldn't that create an error in the console? I cant't imagine that 'dispay' exists already if it wasn't defined as a CSS style. Unless the the javascript console doesn't care about CSS.