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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/scroll_event below:

Element: scroll event - Web APIs

Baseline Widely available

The scroll event fires when an element has been scrolled. To detect when scrolling has completed, see the scrollend event of Element.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("scroll", (event) => { })

onscroll = (event) => { }

A generic Event.

The following examples show how to use the scroll event with an event listener and with the onscroll event handler property. The setTimeout() method is used to throttle the event handler because scroll events can fire at a high rate. For additional examples that use requestAnimationFrame(), see the Document scroll event page.

The following example shows how to use the scroll event to detect when the user is scrolling inside an element:

<div
  id="scroll-box"
  style="overflow: scroll; height: 100px; width: 100px; float: left;">
  <p style="height: 200px; width: 200px;">Scroll me!</p>
</div>
<p style="text-align: center;" id="output">Waiting on scroll events...</p>

const element = document.querySelector("div#scroll-box");
const output = document.querySelector("p#output");

element.addEventListener("scroll", (event) => {
  output.textContent = "Scroll event fired!";
  setTimeout(() => {
    output.textContent = "Waiting on scroll events...";
  }, 1000);
});

The following example shows how to use the onscroll event handler property to detect when the user is scrolling:

<div
  id="scroll-box"
  style="overflow: scroll; height: 100px; width: 100px; float: left;">
  <p style="height: 200px; width: 200px;">Scroll me!</p>
</div>
<p id="output" style="text-align: center;">Waiting on scroll events...</p>

const element = document.querySelector("div#scroll-box");
const output = document.querySelector("p#output");

element.onscroll = (event) => {
  output.textContent = "Element scroll event fired!";
  setTimeout(() => {
    output.textContent = "Waiting on scroll events...";
  }, 1000);
};

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