useIsTextTruncated

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Example

Demo Code

import useIsTextTruncated from "@/hooks/useIsTextTruncated";
import { useRef } from "react";

export default function UseIsTextTruncated() {
  const refOfValue = useRef(null);
  const refOfValue2 = useRef(null);

  const itsTruncatedValue = useIsTextTruncated(refOfValue);
  const notTruncatedValue = useIsTextTruncated(refOfValue2);

  return (
    <div className="flex flex-col items-center justify-center gap-4 p-4">
      <div className="flex flex-col gap-2">
        <p>
          <b>Is Text Truncated:</b> {itsTruncatedValue ? "Yes" : "No"}
        </p>
        <div className="h-10 w-40 overflow-hidden whitespace-nowrap">
          <p className="truncate" ref={refOfValue}>
            Lorem ipsum dolor sit amet consectetur adipisicing elit. Quisquam
            quas, quos, quae, quia quidem quibusdam
          </p>
        </div>
      </div>
      <div className="flex flex-col gap-2">
        <p>
          <b>Is Text Truncated:</b> {notTruncatedValue ? "Yes" : "No"}
        </p>
        <div className="whitespace-nowrap">
          <p ref={refOfValue2}>
            Lorem ipsum dolor sit amet consectetur adipisicing elit. Quisquam
            quas, quos, quae, quia quidem quibusdam
          </p>
        </div>
      </div>
    </div>
  );
}

Code

import { type RefObject, useEffect, useRef, useState } from "react";

/**
 * @description A hook that checks if the text content of an element is truncated or not.
 * @param {RefObject<HTMLElement>} ref A reference to the element to check if its text is truncated.
 * @returns {boolean} A boolean indicating if the text is truncated or not.
 */
export default function useIsTextTruncated(ref: RefObject<HTMLElement>) {
  const [textTruncated, setTextTruncated] = useState<boolean>(false);
  const prevContentRef = useRef<string | null>(null);

  useEffect(() => {
    const element = ref.current;
    if (element) {
      const currentContent = element.textContent || "";
      if (prevContentRef.current !== currentContent) {
        prevContentRef.current = currentContent;
      }
      if (element.scrollWidth > element.offsetWidth) {
        setTextTruncated(true);
      } else {
        setTextTruncated(false);
      }
    }
  }, [ref, ref.current?.textContent]);

  return textTruncated;
}