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Start your free trialMadeline Yao
Full Stack JavaScript Techdegree Student 9,611 PointsThe Button In My Code Does Not Work
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!
Antti Lylander
9,686 PointsOr take a snapshot.
Colton Ehrman
255 PointsColton Ehrman
255 PointsDo you mind fixing up the code format? It's hard to read.