https://i.sstatic.net/Vx3M7.jpg
I am looking to implement a scroll event listener on a specific element, where an arrow icon will appear when the user scrolls up in the message box. Similar to the functionality seen in the Youtube live chat image above.
Are there any alternative methods for achieving this?
If you want to detect a scroll event on any element, you can use the code snippet below:
element.addEventListener("scroll", function(){
// do something
});
To retrieve the current scroll position of the element, simply access element.scrollTop
You can then check if the element's scroll position is less than its total height. If it is, show a button for scrolling back down. When the button with the downward arrow is clicked, you can easily utilize element.scrollTo(), which includes smooth scrolling effects in modern browsers. Just provide the scroll value as the height of the containing element.
You can utilize the scroll event activated by the div container and add an event listener using addEventListener().
For instance, you can create a functionality that dynamically appends more items to a list as the user scrolls to the bottom.
To determine when the user has reached the bottom, check if
scrollHeight - scrollTop === clientHeightIf you wish to automatically scroll to the bottom, set scrollTop = scrollHeight.
const list = [];
const ul = document.querySelector('ul');
const len = document.querySelector('span');
const button = document.querySelector('button');
button.addEventListener('click', () => {
ul.scrollTop = ul.scrollHeight;
});
const appendBlock = () => {
if (list.length >= 200) return;
list.push(...Array.from({ length: 20 }, (_, i) => i + list.length));
ul.innerHTML = list.map(i => `<li>Elem ${i}</li>`).join('');
len.textContent = list.length;
}
ul.addEventListener('scroll', event => {
const e = event.target;
if (e.scrollHeight - e.scrollTop === e.clientHeight) {
appendBlock();
}
});
appendBlock();#container {
position: relative;
border: 1px solid black;
border-radius: 5px;
}
ul {
height: 110px;
overflow: auto;
}
button {
position: absolute;
left: 50%;
bottom: 10px;
width: 30px;
height: 30px;
border-radius: 30px;
background: #08f;
color: white;
font-weight: bold;
font-size: 17px;
cursor: pointer;
}<div id="container">
<ul></ul>
<button>↓</button>
</div>
<br>
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