reactjs - 对 mousedown 和 touchstart 事件的 React TypeScript 类型”

Question

如何为 mousedown 和 touchstart 事件指定 TypeScript 类型？

function useOnClickOutside(ref: React.RefObject<any>, handler: () => void) {
  React.useEffect(() => {
    const listener = (event: React.TouchEvent | React.MouseEvent) => {
      if (!ref || !ref.current) {
        return;
      }
      const elem = document.getElementsByClassName(uniqueClassName)[0];
      if (elem.contains(event.target)) {
        return;
      }
      handler();
    };

    document.addEventListener("mousedown", listener);
    document.addEventListener("touchstart", listener);

    return () => {
      document.removeEventListener("mousedown", listener);
      document.removeEventListener("touchstart", listener);
    };
  }, [ref, handler]);
}

Answer 1

您使用的是 DOM 原生事件，不是 React SyntheticEvent .

所以类型应该是 DOM MouseEvent和 TouchEvent接口(interface)。

例如

function useOnClickOutside(ref: React.RefObject<any>, handler: () => void) {
  React.useEffect(() => {
    const listener = (event: TouchEvent | MouseEvent) => {
      if (!ref || !ref.current) {
        return;
      }
      const uniqueClassName = 'test';
      const elem = document.getElementsByClassName(uniqueClassName)[0];
      if (elem.contains(event.target as Node)) {
        return;
      }
      handler();
    };

    document.addEventListener('mousedown', listener);
    document.addEventListener('touchstart', listener);

    return () => {
      document.removeEventListener('mousedown', listener);
      document.removeEventListener('touchstart', listener);
    };
  }, [ref, handler]);
}

TypeScript 版本:"typescript": "^4.1.2"