The Button In My Code Does Not Work

Question

Here is my code for the tutorial: a. index.html <!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>

<button id="hide">Hide list</button>
<div class="list">
    <p>Things that are purple:</p>
    <input type="text" class="blanks">
    <button class="description">Change list description</button>
    <ul>
      <li>grapes    
          <button class= "remove">Remove</button>
          <button class="up">Up</button>
          <button class= "down">Down</button>
      </li>
      <li>amethyst  
          <button class="remove">Remove</button>
          <button class="up">Up </button>
          <button class="down">Down</button>
      </li>
      <li>lavender  
          <button class="remove">Remove</button>
          <button class="up">Up</button>
          <button class="down">Down</button>
      </li>
      <li>plums     
          <button class="remove">Remove</button>
          <button class="up">Up</button>
          <button class="down">Down</button>
      </li>
    </ul>
    <input type="text" class="addItemInput">
    <button class="addItemInput">Add Item</button>

 </div>
<script src="app.js"></script>
<script src="temp.js"></script>

</body> </html> b. app.js: onst p = document.querySelector('p'); const input = document.querySelector('input.blanks'); const button = document.querySelector('button.description'); const list = document.querySelector('.list'); const listUl = list.querySelector('ul'); var hide_button = document.querySelector('#hide'); const add_button = document.querySelector('button.addItemInput'); const add_input = document.querySelector('input.addItemInput'); const lis = listUl.children; const listItems = document.getElementsByTagName('li'); const firstListItem = listUl.firstChildElement; const lastListItem = listUl.lastChildElement; firstListItem.style.backgroundColor = 'blue'; lastListItem.style.backgroundColor = 'red';

button.addEventListener('click', ()=>{ p.value = input.value; });

function addButtonsToNewItems(li){ let up = document.createElement('button'); up.className = 'up'; up.textContent = 'Up'; let down = document.createElement('button'); down.className = 'down'; down.textContent = 'Down';

let remove = document.createElement('button'); remove.className = 'remove'; remove.textContent = 'Remove';

}

for(let i = 0; i < lis.length; i +=1){ addButtonsToNewItems(lis[i]); }

list.addEventListener('mouseover', (event)=>{
  if(event.target.tagName === 'LI'){
    event.target.textContent = event.target.textContent.toUpperCase();                         
  }                       
  }); 

list.addEventListener('mouseout', (event)=>{
  if(event.target.tagName === 'LI'){
    event.target.textContent = event.target.textContent.toLowerCase();                          
  }                         
                            }); 

 listUl.addEventListener('click', (event) =>{
    if(event.target.tagName== 'BUTTON' ){
      if(event.target.className == 'remove'){
       let li = event.target.parentNode; 
       let ul = li.parentNode; 
       ul.removeChild(li); 
      } 
       if(event.target.className == 'up'){
           let li = event.target.parentNode; 
           let ul = li.parentNode; 
           let prevLi = li.previousElementSibling; 
           ul.insertBefore(li, prevLi); 
       }
    }


 });

button.addEventListener('click', ()=>{ p.innerHTML = input.value; });

hide_button.addEventListener('click', ()=>{ if(list.style.display === 'none'){ hide_button.textContent = 'hide list'; list.style.display ==='block'; } else{ hide_button.textContent = 'show list'; list.style.display === 'none'; } });

add_button.addEventListener('click', ()=>{ let ul = document.getElementsByTagName('ul')[0]; let li = document.createElement('li'); li.textContent = add_input.value; addButtonsToNewItems(li); ul.appendChild(li); add_input.value = '';

});

I tried to run the code above but I cannot find what makes the button on the webpage not work well. Could anyone please help me find out the bug? Thank you!

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