The Element.scrollWidth read-only property is a measurement of the width of an element's content, including content not visible on the screen due to overflow.
The scrollWidth value is equal to the minimum width the element would require in order to fit all the content in the viewport without using a horizontal scrollbar. The width is measured in the same way as clientWidth: it includes the element's padding, but not its border, margin or vertical scrollbar (if present). It can also include the width of pseudo-elements such as ::before or ::after. If the element's content can fit without a need for horizontal scrollbar, its scrollWidth is equal to clientWidth
<!doctype html>
<html lang="en-US">
<head>
<meta charset="UTF-8" />
<title>Example</title>
<style>
div {
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
}
#aDiv {
width: 100px;
}
button {
margin-bottom: 2em;
}
</style>
</head>
<body>
<div id="aDiv">FooBar-FooBar-FooBar-FooBar</div>
<button id="aButton">Check for overflow</button>
<div id="anotherDiv">FooBar-FooBar-FooBar-FooBar</div>
<button id="anotherButton">Check for overflow</button>
</body>
<script>
const buttonOne = document.getElementById("aButton");
const buttonTwo = document.getElementById("anotherButton");
const divOne = document.getElementById("aDiv");
const divTwo = document.getElementById("anotherDiv");
function isOverflowing(element) {
return element.scrollWidth > element.offsetWidth;
}
function alertOverflow(element) {
if (isOverflowing(element)) {
alert("Contents are overflowing the container.");
} else {
alert("No overflows!");
}
}
buttonOne.addEventListener("click", () => {
alertOverflow(divOne);
});
buttonTwo.addEventListener("click", () => {
alertOverflow(divTwo);
});
</script>
</html>