react-beautiful-dnd/src/view/drag-handle/util/bind-events.js

Beautiful, accessible drag and drop for lists with React.js

// @flow
import type { EventBinding, EventOptions } from './event-types';

const getOptions = (
  shared?: EventOptions,
  fromBinding: ?EventOptions,
): EventOptions => ({
  ...shared,
  ...fromBinding,
});

export const bindEvents = (
  el: HTMLElement,
  bindings: EventBinding[],
  sharedOptions?: EventOptions,
) => {
  bindings.forEach((binding: EventBinding) => {
    const options: Object = getOptions(sharedOptions, binding.options);

    el.addEventListener(binding.eventName, binding.fn, options);
  });
};

export const unbindEvents = (
  el: HTMLElement,
  bindings: EventBinding[],
  sharedOptions?: EventOptions,
) => {
  bindings.forEach((binding: EventBinding) => {
    const options: Object = getOptions(sharedOptions, binding.options);

    el.removeEventListener(binding.eventName, binding.fn, options);
  });
};