Bootstrap/js/dist/dom/event-handler.js

/*!
  * Bootstrap event-handler.js v4.3.1 (https://getbootstrap.com/)
  * Copyright 2011-2019 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.EventHandler = factory());
}(this, function () { 'use strict';

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v4.3.1): util/index.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */
  var MAX_UID = 1000000;
  var _window = window,
      jQuery = _window.jQuery; // Shoutout AngusCroll (https://goo.gl/pxwQGp)
  /**
   * --------------------------------------------------------------------------
   * Public Util Api
   * --------------------------------------------------------------------------
   */


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

    return prefix;
  };

  /* istanbul ignore file */
  var _Element$prototype = Element.prototype,
      matches = _Element$prototype.matches,
      closest = _Element$prototype.closest;
  var find = Element.prototype.querySelectorAll;
  var findOne = Element.prototype.querySelector;

  var createCustomEvent = function createCustomEvent(eventName, params) {
    var cEvent = new CustomEvent(eventName, params);
    return cEvent;
  };

  if (typeof window.CustomEvent !== 'function') {
    createCustomEvent = function createCustomEvent(eventName, params) {
      params = params || {
        bubbles: false,
        cancelable: false,
        detail: null
      };
      var evt = document.createEvent('CustomEvent');
      evt.initCustomEvent(eventName, params.bubbles, params.cancelable, params.detail);
      return evt;
    };
  }

  var workingDefaultPrevented = function () {
    var e = document.createEvent('CustomEvent');
    e.initEvent('Bootstrap', true, true);
    e.preventDefault();
    return e.defaultPrevented;
  }();

  if (!workingDefaultPrevented) {
    var origPreventDefault = Event.prototype.preventDefault;

    Event.prototype.preventDefault = function () {
      if (!this.cancelable) {
        return;
      }

      origPreventDefault.call(this);
      Object.defineProperty(this, 'defaultPrevented', {
        get: function get() {
          return true;
        },
        configurable: true
      });
    };
  } // MSEdge resets defaultPrevented flag upon dispatchEvent call if at least one listener is attached


  var defaultPreventedPreservedOnDispatch = function () {
    var e = createCustomEvent('Bootstrap', {
      cancelable: true
    });
    var element = document.createElement('div');
    element.addEventListener('Bootstrap', function () {
      return null;
    });
    e.preventDefault();
    element.dispatchEvent(e);
    return e.defaultPrevented;
  }();

  if (!matches) {
    matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
  }

  if (!closest) {
    closest = function closest(selector) {
      var element = this;

      do {
        if (matches.call(element, selector)) {
          return element;
        }

        element = element.parentElement || element.parentNode;
      } while (element !== null && element.nodeType === 1);

      return null;
    };
  }

  var scopeSelectorRegex = /:scope\b/;

  var supportScopeQuery = function () {
    var element = document.createElement('div');

    try {
      element.querySelectorAll(':scope *');
    } catch (error) {
      return false;
    }

    return true;
  }();

  if (!supportScopeQuery) {
    find = function find(selector) {
      if (!scopeSelectorRegex.test(selector)) {
        return this.querySelectorAll(selector);
      }

      var hasId = Boolean(this.id);

      if (!hasId) {
        this.id = getUID('scope');
      }

      var nodeList = null;

      try {
        selector = selector.replace(scopeSelectorRegex, "#" + this.id);
        nodeList = this.querySelectorAll(selector);
      } finally {
        if (!hasId) {
          this.removeAttribute('id');
        }
      }

      return nodeList;
    };

    findOne = function findOne(selector) {
      if (!scopeSelectorRegex.test(selector)) {
        return this.querySelector(selector);
      }

      var matches = find.call(this, selector);

      if (typeof matches[0] !== 'undefined') {
        return matches[0];
      }

      return null;
    };
  }

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v4.3.1): dom/event-handler.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */
  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  var namespaceRegex = /[^.]*(?=\..*)\.|.*/;
  var stripNameRegex = /\..*/;
  var keyEventRegex = /^key/;
  var stripUidRegex = /::\d+$/;
  var eventRegistry = {}; // Events storage

  var uidEvent = 1;
  var customEvents = {
    mouseenter: 'mouseover',
    mouseleave: 'mouseout'
  };
  var nativeEvents = ['click', 'dblclick', 'mouseup', 'mousedown', 'contextmenu', 'mousewheel', 'DOMMouseScroll', 'mouseover', 'mouseout', 'mousemove', 'selectstart', 'selectend', 'keydown', 'keypress', 'keyup', 'orientationchange', 'touchstart', 'touchmove', 'touchend', 'touchcancel', 'pointerdown', 'pointermove', 'pointerup', 'pointerleave', 'pointercancel', 'gesturestart', 'gesturechange', 'gestureend', 'focus', 'blur', 'change', 'reset', 'select', 'submit', 'focusin', 'focusout', 'load', 'unload', 'beforeunload', 'resize', 'move', 'DOMContentLoaded', 'readystatechange', 'error', 'abort', 'scroll'];
  /**
   * ------------------------------------------------------------------------
   * Private methods
   * ------------------------------------------------------------------------
   */

  function getUidEvent(element, uid) {
    return uid && uid + "::" + uidEvent++ || element.uidEvent || uidEvent++;
  }

  function getEvent(element) {
    var uid = getUidEvent(element);
    element.uidEvent = uid;
    eventRegistry[uid] = eventRegistry[uid] || {};
    return eventRegistry[uid];
  }

  function fixEvent(event, element) {
    // Add which for key events
    if (event.which === null && keyEventRegex.test(event.type)) {
      event.which = event.charCode === null ? event.keyCode : event.charCode;
    }

    event.delegateTarget = element;
  }

  function bootstrapHandler(element, fn) {
    return function handler(event) {
      fixEvent(event, element);

      if (handler.oneOff) {
        EventHandler.off(element, event.type, fn);
      }

      return fn.apply(element, [event]);
    };
  }

  function bootstrapDelegationHandler(element, selector, fn) {
    return function handler(event) {
      var domElements = element.querySelectorAll(selector);

      for (var target = event.target; target && target !== this; target = target.parentNode) {
        for (var i = domElements.length; i--;) {
          if (domElements[i] === target) {
            fixEvent(event, target);

            if (handler.oneOff) {
              EventHandler.off(element, event.type, fn);
            }

            return fn.apply(target, [event]);
          }
        }
      } // To please ESLint


      return null;
    };
  }

  function findHandler(events, handler, delegationSelector) {
    if (delegationSelector === void 0) {
      delegationSelector = null;
    }

    for (var _i = 0, _Object$keys = Object.keys(events); _i < _Object$keys.length; _i++) {
      var uid = _Object$keys[_i];
      var event = events[uid];

      if (event.originalHandler === handler && event.delegationSelector === delegationSelector) {
        return events[uid];
      }
    }

    return null;
  }

  function normalizeParams(originalTypeEvent, handler, delegationFn) {
    var delegation = typeof handler === 'string';
    var originalHandler = delegation ? delegationFn : handler; // allow to get the native events from namespaced events ('click.bs.button' --> 'click')

    var typeEvent = originalTypeEvent.replace(stripNameRegex, '');
    var custom = customEvents[typeEvent];

    if (custom) {
      typeEvent = custom;
    }

    var isNative = nativeEvents.indexOf(typeEvent) > -1;

    if (!isNative) {
      typeEvent = originalTypeEvent;
    }

    return [delegation, originalHandler, typeEvent];
  }

  function addHandler(element, originalTypeEvent, handler, delegationFn, oneOff) {
    if (typeof originalTypeEvent !== 'string' || !element) {
      return;
    }

    if (!handler) {
      handler = delegationFn;
      delegationFn = null;
    }

    var _normalizeParams = normalizeParams(originalTypeEvent, handler, delegationFn),
        delegation = _normalizeParams[0],
        originalHandler = _normalizeParams[1],
        typeEvent = _normalizeParams[2];

    var events = getEvent(element);
    var handlers = events[typeEvent] || (events[typeEvent] = {});
    var previousFn = findHandler(handlers, originalHandler, delegation ? handler : null);

    if (previousFn) {
      previousFn.oneOff = previousFn.oneOff && oneOff;
      return;
    }

    var uid = getUidEvent(originalHandler, originalTypeEvent.replace(namespaceRegex, ''));
    var fn = delegation ? bootstrapDelegationHandler(element, handler, delegationFn) : bootstrapHandler(element, handler);
    fn.delegationSelector = delegation ? handler : null;
    fn.originalHandler = originalHandler;
    fn.oneOff = oneOff;
    fn.uidEvent = uid;
    handlers[uid] = fn;
    element.addEventListener(typeEvent, fn, delegation);
  }

  function removeHandler(element, events, typeEvent, handler, delegationSelector) {
    var fn = findHandler(events[typeEvent], handler, delegationSelector);

    if (fn === null) {
      return;
    }

    element.removeEventListener(typeEvent, fn, Boolean(delegationSelector));
    delete events[typeEvent][fn.uidEvent];
  }

  function removeNamespacedHandlers(element, events, typeEvent, namespace) {
    var storeElementEvent = events[typeEvent] || {};
    Object.keys(storeElementEvent).forEach(function (handlerKey) {
      if (handlerKey.indexOf(namespace) > -1) {
        var event = storeElementEvent[handlerKey];
        removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector);
      }
    });
  }

  var EventHandler = {
    on: function on(element, event, handler, delegationFn) {
      addHandler(element, event, handler, delegationFn, false);
    },
    one: function one(element, event, handler, delegationFn) {
      addHandler(element, event, handler, delegationFn, true);
    },
    off: function off(element, originalTypeEvent, handler, delegationFn) {
      if (typeof originalTypeEvent !== 'string' || !element) {
        return;
      }

      var _normalizeParams2 = normalizeParams(originalTypeEvent, handler, delegationFn),
          delegation = _normalizeParams2[0],
          originalHandler = _normalizeParams2[1],
          typeEvent = _normalizeParams2[2];

      var inNamespace = typeEvent !== originalTypeEvent;
      var events = getEvent(element);
      var isNamespace = originalTypeEvent.charAt(0) === '.';

      if (typeof originalHandler !== 'undefined') {
        // Simplest case: handler is passed, remove that listener ONLY.
        if (!events || !events[typeEvent]) {
          return;
        }

        removeHandler(element, events, typeEvent, originalHandler, delegation ? handler : null);
        return;
      }

      if (isNamespace) {
        Object.keys(events).forEach(function (elementEvent) {
          removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.substr(1));
        });
      }

      var storeElementEvent = events[typeEvent] || {};
      Object.keys(storeElementEvent).forEach(function (keyHandlers) {
        var handlerKey = keyHandlers.replace(stripUidRegex, '');

        if (!inNamespace || originalTypeEvent.indexOf(handlerKey) > -1) {
          var event = storeElementEvent[keyHandlers];
          removeHandler(element, events, typeEvent, event.originalHandler, event.delegationSelector);
        }
      });
    },
    trigger: function trigger(element, event, args) {
      if (typeof event !== 'string' || !element) {
        return null;
      }

      var typeEvent = event.replace(stripNameRegex, '');
      var inNamespace = event !== typeEvent;
      var isNative = nativeEvents.indexOf(typeEvent) > -1;
      var jQueryEvent;
      var bubbles = true;
      var nativeDispatch = true;
      var defaultPrevented = false;
      var evt = null;

      if (inNamespace && typeof jQuery !== 'undefined') {
        jQueryEvent = jQuery.Event(event, args);
        jQuery(element).trigger(jQueryEvent);
        bubbles = !jQueryEvent.isPropagationStopped();
        nativeDispatch = !jQueryEvent.isImmediatePropagationStopped();
        defaultPrevented = jQueryEvent.isDefaultPrevented();
      }

      if (isNative) {
        evt = document.createEvent('HTMLEvents');
        evt.initEvent(typeEvent, bubbles, true);
      } else {
        evt = createCustomEvent(event, {
          bubbles: bubbles,
          cancelable: true
        });
      } // merge custom informations in our event


      if (typeof args !== 'undefined') {
        Object.keys(args).forEach(function (key) {
          Object.defineProperty(evt, key, {
            get: function get() {
              return args[key];
            }
          });
        });
      }

      if (defaultPrevented) {
        evt.preventDefault();

        if (!defaultPreventedPreservedOnDispatch) {
          Object.defineProperty(evt, 'defaultPrevented', {
            get: function get() {
              return true;
            }
          });
        }
      }

      if (nativeDispatch) {
        element.dispatchEvent(evt);
      }

      if (evt.defaultPrevented && typeof jQueryEvent !== 'undefined') {
        jQueryEvent.preventDefault();
      }

      return evt;
    }
  };

  return EventHandler;

}));
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