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useResizeObserver

使用 ResizeObserver MDN 跟踪元素大小。

Usage​

实时编辑器

function Demo() {
  const ref = useRef<HTMLTextAreaElement>(null);
  const [width, setWidth] = useState(0);
  const [height, setHeight] = useState(0);
  const stop = useResizeObserver(ref, (entries) => {
    const [entry] = entries;
    const { width, height } = entry.contentRect;
    setWidth(width);
    setHeight(height);
  });

  return (
    <div>
      <div>Resize the box to see changes</div>
      <div>
        <button onClick={() => stop()}>stop observe</button>
      </div>
      <br />
      <textarea
        ref={ref}
        disabled
        style={{ width: 286, height: 166 }}
        value={`width: ${width}\nheight: ${height}`}
      />
    </div>
  );
};
结果
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API​

useResizeObserver​

Returns​

() => void

Arguments​

参数名描述类型默认值
targetdom元素BasicTarget<Element> (必填)-
callback回调ResizeObserverCallback (必填)-
optionsresizeObserver 参数ResizeObserverOptions | undefined-

BasicTarget​

export type BasicTarget<T extends TargetType = Element> = (() => TargetValue<T>) | TargetValue<T> | MutableRefObject<TargetValue<T>>;

TargetValue​

type TargetValue<T> = T | undefined | null;

TargetType​

type TargetType = HTMLElement | Element | Window | Document | EventTarget;