How Can I Detect Text Overflow with an Ellipsis Using JavaScript?

Detecting Text Overflow in Elements with Ellipsis

In HTML, the text-overflow property allows you to truncate overflowing text and use an ellipsis to indicate the continuation. However, you may need a way to programmatically determine which elements' text is being truncated using JavaScript.

One method to achieve this is by comparing the offset width and the scroll width of the element containing the overflowing text. The offset width represents the actual width of the element on the page, while the scroll width includes the overflowing portion that is hidden.

Here's a simple JavaScript function that can be used to detect if an element's text is overflowing:

function isEllipsisActive(e) {
    return (e.offsetWidth < e.scrollWidth);
}

You can use this function by passing the span element that contains the text to check as an argument. If the function returns true, then the element's text is being truncated with an ellipsis.

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