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

/*!
  * Bootstrap event-handler.js v5.0.0-alpha1 (https://getbootstrap.com/)
  * Copyright 2011-2020 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(require('./polyfill.js')) :
  typeof define === 'function' && define.amd ? define(['./polyfill.js'], factory) :
  (global = global || self, global.EventHandler = factory(global.Polyfill));
}(this, (function (polyfill_js) { 'use strict';

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.0.0-alpha1): util/index.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */

  var getjQuery = function getjQuery() {
    var _window = window,
        jQuery = _window.jQuery;

    if (jQuery && !document.body.hasAttribute('data-no-jquery')) {
      return jQuery;
    }

    return null;
  };

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.0.0-alpha1): dom/event-handler.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
   * --------------------------------------------------------------------------
   */
  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  var $ = getjQuery();
  var namespaceRegex = /[^.]*(?=\..*)\.|.*/;
  var stripNameRegex = /\..*/;
  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 bootstrapHandler(element, fn) {
    return function handler(event) {
      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) {
            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;
    }

    var uidEventList = Object.keys(events);

    for (var i = 0, len = uidEventList.length; i < len; i++) {
      var event = events[uidEventList[i]];

      if (event.originalHandler === handler && event.delegationSelector === delegationSelector) {
        return event;
      }
    }

    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) {
      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.slice(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 && $) {
        jQueryEvent = $.Event(event, args);
        $(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 = new CustomEvent(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 (!polyfill_js.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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