js/dist/util.js

/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.0.0-alpha.4): util.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

'use strict';

var Util = (function ($) {

  /**
   * ------------------------------------------------------------------------
   * Private TransitionEnd Helpers
   * ------------------------------------------------------------------------
   */

  var transition = false;

  var MAX_UID = 1000000;

  var TransitionEndEvent = {
    WebkitTransition: 'webkitTransitionEnd',
    MozTransition: 'transitionend',
    OTransition: 'oTransitionEnd otransitionend',
    transition: 'transitionend'
  };

  // shoutout AngusCroll (https://goo.gl/pxwQGp)
  function toType(obj) {
    return ({}).toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase();
  }

  function isElement(obj) {
    return (obj[0] || obj).nodeType;
  }

  function getSpecialTransitionEndEvent() {
    return {
      bindType: transition.end,
      delegateType: transition.end,
      handle: function handle(event) {
        if ($(event.target).is(this)) {
          return event.handleObj.handler.apply(this, arguments); // eslint-disable-line prefer-rest-params
        }
        return undefined;
      }
    };
  }

  function transitionEndTest() {
    if (window.QUnit) {
      return false;
    }

    var el = document.createElement('bootstrap');

    for (var _name in TransitionEndEvent) {
      if (el.style[_name] !== undefined) {
        return { end: TransitionEndEvent[_name] };
      }
    }

    return false;
  }

  function transitionEndEmulator(duration) {
    var _this = this;

    var called = false;

    $(this).one(Util.TRANSITION_END, function () {
      called = true;
    });

    setTimeout(function () {
      if (!called) {
        Util.triggerTransitionEnd(_this);
      }
    }, duration);

    return this;
  }

  function setTransitionEndSupport() {
    transition = transitionEndTest();

    $.fn.emulateTransitionEnd = transitionEndEmulator;

    if (Util.supportsTransitionEnd()) {
      $.event.special[Util.TRANSITION_END] = getSpecialTransitionEndEvent();
    }
  }

  /**
   * --------------------------------------------------------------------------
   * Public Util Api
   * --------------------------------------------------------------------------
   */

  var Util = {

    TRANSITION_END: 'bsTransitionEnd',

    getUID: function getUID(prefix) {
      do {
        /* eslint-disable no-bitwise */
        prefix += ~ ~(Math.random() * MAX_UID); // "~~" acts like a faster Math.floor() here
        /* eslint-enable no-bitwise */
      } while (document.getElementById(prefix));
      return prefix;
    },

    getSelectorFromElement: function getSelectorFromElement(element) {
      var selector = element.getAttribute('data-target');

      if (!selector) {
        selector = element.getAttribute('href') || '';
        selector = /^#[a-z]/i.test(selector) ? selector : null;
      }

      return selector;
    },

    reflow: function reflow(element) {
      new Function('bs', 'return bs')(element.offsetHeight);
    },

    triggerTransitionEnd: function triggerTransitionEnd(element) {
      $(element).trigger(transition.end);
    },

    supportsTransitionEnd: function supportsTransitionEnd() {
      return Boolean(transition);
    },

    typeCheckConfig: function typeCheckConfig(componentName, config, configTypes) {
      for (var property in configTypes) {
        if (configTypes.hasOwnProperty(property)) {
          var expectedTypes = configTypes[property];
          var value = config[property];
          var valueType = undefined;

          if (value && isElement(value)) {
            valueType = 'element';
          } else {
            valueType = toType(value);
          }

          if (!new RegExp(expectedTypes).test(valueType)) {
            throw new Error(componentName.toUpperCase() + ': ' + ('Option "' + property + '" provided type "' + valueType + '" ') + ('but expected type "' + expectedTypes + '".'));
          }
        }
      }
    }
  };

  setTransitionEndSupport();

  return Util;
})(jQuery);
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