hooks#useEventListener TypeScript Examples

The following examples show how to use hooks#useEventListener. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: useOutsideClick.ts    From frontend with GNU General Public License v3.0 5 votes vote down vote up 
useOutsideClick = (ref: RefObject<HTMLElement>, callback: () => void): void => {
  const handleClick = (e: Event) => {
    if (ref.current && !ref.current.contains(e.target as HTMLElement)) {
      callback();
    }
  };
  useEventListener('click', handleClick);
}
Example #2
Source File: Options.tsx    From ebs-design with MIT License 4 votes vote down vote up 
Options: React.FC<OptionsProps> = ({
  mode = 'single',
  scrollMode = 'regular',
  loading,
  options = [],
  value,
  emptyLabel = 'No found',
  newOption,
  onNext,
  onClose,
  onChange,
  onClickAddNew,
  ...props
}) => {
  const ref = React.useRef<HTMLDivElement | null>(null);
  const { offsetBottom, maxHeight, setState } = React.useContext(Context);
  const [activeItem, setActiveItem] = React.useState(0);

  const onScroll = (e): void => {
    const scrollTop = Math.floor(e.target.scrollTop);

    if (scrollMode !== 'regular' && onNext && e.target.scrollHeight - e.target.offsetHeight - scrollTop <= 3) {
      onNext();
    }
  };

  React.useEffect(() => {
    const rect = ref.current?.getBoundingClientRect();

    if (!maxHeight && rect?.height && offsetBottom && options.length && !loading) {
      const height = window.innerHeight - offsetBottom;

      setState({ maxHeight: height <= rect.height ? height : rect.height - +(scrollMode === 'scroll') });
    }
  }, [ref.current, offsetBottom, scrollMode, options, loading, maxHeight]);

  React.useEffect(() => {
    if (ref.current && !scrollMode && options?.length) {
      ref.current.scrollTop = 0;
    }
  }, [ref.current, options, scrollMode]);

  React.useEffect(() => {
    if (ref.current && scrollMode === 'scroll') {
      ref.current.addEventListener('scroll', onScroll);
    }

    return () => {
      if (ref.current && scrollMode === 'scroll') {
        ref.current.removeEventListener('scroll', onScroll);
      }
    };
  }, [ref.current, onScroll, scrollMode]);

  useEventListener(
    'keydown',
    ({ key }: { key: string }) => {
      if (['ArrowUp', 'ArrowDown', 'Escape', 'Enter'].includes(key)) {
        if (key === 'Escape' && mode === 'single' && onClose !== undefined) {
          onClose();
        }

        if (key === 'Enter' && onChange !== undefined) {
          const option = options[activeItem - 1];
          onChange(option.value);

          if (mode === 'single' && onClose !== undefined) {
            onClose();
          }
        }

        // User pressed the up arrow
        if (key === 'ArrowUp') {
          setActiveItem((s) => (s !== 0 ? s - 1 : options.length));
        }

        // User pressed the down arrow
        if (key === 'ArrowDown') {
          setActiveItem((s) => (s < options.length ? s + 1 : 0));
        }
      }
    },
    ref,
  );

  const onChangeHandler = (value: any): void => {
    if (onChange !== undefined) {
      onChange(value);
    }

    if (onClose !== undefined) {
      onClose();
    }
  };

  return (
    <div
      ref={ref}
      {...props}
      className={cn(
        'ebs-select__options-items',
        {
          'ebs-select__options--multiple': ['multiple', 'tags'].includes(mode),
        },
        props.className,
      )}
      style={maxHeight ? { ...props.style, maxHeight } : props.style}
    >
      {newOption && onClickAddNew && (
        <Item
          value={newOption}
          text={newOption}
          selected
          onClick={() => onClickAddNew(newOption)}
          suffix={<Label type="ghost" text="CTRL+Enter" />}
        />
      )}

      <Loader
        loading={scrollMode !== 'scroll' ? loading || false : false}
        height={!ref.current || ref.current?.offsetHeight < 300 ? 300 : ref.current.offsetHeight}
      >
        {options.length
          ? options.map((option, key) => (
              <Item
                key={key}
                active={
                  ['multiple', 'tags'].includes(mode) && Array.isArray(value)
                    ? value.includes(option.value)
                    : value === option.value
                }
                mode={mode}
                text={option.text}
                selected={activeItem === key + 1}
                onClick={onChangeHandler}
                {...option}
              />
            ))
          : !loading && (
              <Space size="large" justify="center" className="ebs-select__options--empty">
                {emptyLabel}
              </Space>
            )}
      </Loader>

      {loading ? (
        <Space justify="center" className="mt-10">
          <Loader.Inline />
        </Space>
      ) : null}
    </div>
  );
}