jQuery CSS Transition Callbacks Plugin (ES6)

jquery.transitions.js

/**
 * jQuery Transition Callbacks Module
 * by Mike Green <mike@fifthroomcreative.com>
 */

/* jshint esnext: true, globalstrict: true, browser: true */

'use strict';

import $           from 'jquery';
import assign      from 'lodash.assign';
import isArray     from 'lodash.isarray';
import isString    from 'lodash.isstring';
import includes    from 'lodash.includes';
import isUndefined from 'lodash.isundefined';

let defaults = {
  once: true,
  properties: true
};

let transEvents = [
  'transitionend',
  'webkitTransitionEnd',
  'MSTransitionEnd',
  'oTransitionEnd'
].join(' ');

let validateProperty  = (prop, list) => {
  if (list === true) return true;
  if (list === false || isUndefined(list)) return false;
  let validString = isString(list) && prop === list;
  let validArray  = isArray(list) && includes(list, prop);
  return ( validString || validArray );
};

let transitionWrapper = function transitionWrapper(method = 'toggleClass') {
  return function(klass, fn = $.noop, opts = {}) {
    return $(this).afterTransition(fn, opts)[method](klass);
  };
};

let plugin = {

  afterTransition(fn = $.noop, opts = {}) {
    let opts = assign({}, defaults, opts);

    return this.each((idx, el) => {
      let $el = $(el);

      $el.on(transEvents, function transCallback(evt) {
        let propName = evt.originalEvent.propertyName;

        // If our property name isn't on on the list, skip the callback but don't unbind it
        if (!validateProperty(propName, opts.properties)) {
          return;
        }

        if (opts.once) {
          $(this).off(transEvents, transCallback);
        }

        return fn.call($el, evt, propName);
      });
    });
  },

  transitionToggleClass: transitionWrapper('toggleClass'),

  transitionAddClass: transitionWrapper('addClass'),

  transitionRemoveClass: transitionWrapper('removeClass'),

  killTransitionEvents() {
    return this.each((idx, el) => {
      let $el = $(el);
      $el.on(transEvents, evt => evt.stopPropagation());
    });
  }

};

$.fn.extend(plugin);

export default plugin;