js/dist/dom/event-handler.js

/*!
  * Bootstrap event-handler.js v5.2.1 (https://getbootstrap.com/)
  * Copyright 2011-2022 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('../util/index')) :
  typeof define === 'function' && define.amd ? define(['../util/index'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.EventHandler = factory(global.Index));
})(this, (function (index) { 'use strict';

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.2.1): dom/event-handler.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
   * --------------------------------------------------------------------------
   */
  /**
   * Constants
   */

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

  let uidEvent = 1;
  const customEvents = {
    mouseenter: 'mouseover',
    mouseleave: 'mouseout'
  };
  const nativeEvents = new Set(['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 makeEventUid(element, uid) {
    return uid && `${uid}::${uidEvent++}` || element.uidEvent || uidEvent++;
  }

  function getElementEvents(element) {
    const uid = makeEventUid(element);
    element.uidEvent = uid;
    eventRegistry[uid] = eventRegistry[uid] || {};
    return eventRegistry[uid];
  }

  function bootstrapHandler(element, fn) {
    return function handler(event) {
      hydrateObj(event, {
        delegateTarget: element
      });

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

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

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

      for (let {
        target
      } = event; target && target !== this; target = target.parentNode) {
        for (const domElement of domElements) {
          if (domElement !== target) {
            continue;
          }

          hydrateObj(event, {
            delegateTarget: target
          });

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

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

  function findHandler(events, callable, delegationSelector = null) {
    return Object.values(events).find(event => event.callable === callable && event.delegationSelector === delegationSelector);
  }

  function normalizeParameters(originalTypeEvent, handler, delegationFunction) {
    const isDelegated = typeof handler === 'string'; // todo: tooltip passes `false` instead of selector, so we need to check

    const callable = isDelegated ? delegationFunction : handler || delegationFunction;
    let typeEvent = getTypeEvent(originalTypeEvent);

    if (!nativeEvents.has(typeEvent)) {
      typeEvent = originalTypeEvent;
    }

    return [isDelegated, callable, typeEvent];
  }

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

    let [isDelegated, callable, typeEvent] = normalizeParameters(originalTypeEvent, handler, delegationFunction); // in case of mouseenter or mouseleave wrap the handler within a function that checks for its DOM position
    // this prevents the handler from being dispatched the same way as mouseover or mouseout does

    if (originalTypeEvent in customEvents) {
      const wrapFunction = fn => {
        return function (event) {
          if (!event.relatedTarget || event.relatedTarget !== event.delegateTarget && !event.delegateTarget.contains(event.relatedTarget)) {
            return fn.call(this, event);
          }
        };
      };

      callable = wrapFunction(callable);
    }

    const events = getElementEvents(element);
    const handlers = events[typeEvent] || (events[typeEvent] = {});
    const previousFunction = findHandler(handlers, callable, isDelegated ? handler : null);

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

    const uid = makeEventUid(callable, originalTypeEvent.replace(namespaceRegex, ''));
    const fn = isDelegated ? bootstrapDelegationHandler(element, handler, callable) : bootstrapHandler(element, callable);
    fn.delegationSelector = isDelegated ? handler : null;
    fn.callable = callable;
    fn.oneOff = oneOff;
    fn.uidEvent = uid;
    handlers[uid] = fn;
    element.addEventListener(typeEvent, fn, isDelegated);
  }

  function removeHandler(element, events, typeEvent, handler, delegationSelector) {
    const 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) {
    const storeElementEvent = events[typeEvent] || {};

    for (const handlerKey of Object.keys(storeElementEvent)) {
      if (handlerKey.includes(namespace)) {
        const event = storeElementEvent[handlerKey];
        removeHandler(element, events, typeEvent, event.callable, event.delegationSelector);
      }
    }
  }

  function getTypeEvent(event) {
    // allow to get the native events from namespaced events ('click.bs.button' --> 'click')
    event = event.replace(stripNameRegex, '');
    return customEvents[event] || event;
  }

  const EventHandler = {
    on(element, event, handler, delegationFunction) {
      addHandler(element, event, handler, delegationFunction, false);
    },

    one(element, event, handler, delegationFunction) {
      addHandler(element, event, handler, delegationFunction, true);
    },

    off(element, originalTypeEvent, handler, delegationFunction) {
      if (typeof originalTypeEvent !== 'string' || !element) {
        return;
      }

      const [isDelegated, callable, typeEvent] = normalizeParameters(originalTypeEvent, handler, delegationFunction);
      const inNamespace = typeEvent !== originalTypeEvent;
      const events = getElementEvents(element);
      const storeElementEvent = events[typeEvent] || {};
      const isNamespace = originalTypeEvent.startsWith('.');

      if (typeof callable !== 'undefined') {
        // Simplest case: handler is passed, remove that listener ONLY.
        if (!Object.keys(storeElementEvent).length) {
          return;
        }

        removeHandler(element, events, typeEvent, callable, isDelegated ? handler : null);
        return;
      }

      if (isNamespace) {
        for (const elementEvent of Object.keys(events)) {
          removeNamespacedHandlers(element, events, elementEvent, originalTypeEvent.slice(1));
        }
      }

      for (const keyHandlers of Object.keys(storeElementEvent)) {
        const handlerKey = keyHandlers.replace(stripUidRegex, '');

        if (!inNamespace || originalTypeEvent.includes(handlerKey)) {
          const event = storeElementEvent[keyHandlers];
          removeHandler(element, events, typeEvent, event.callable, event.delegationSelector);
        }
      }
    },

    trigger(element, event, args) {
      if (typeof event !== 'string' || !element) {
        return null;
      }

      const $ = index.getjQuery();
      const typeEvent = getTypeEvent(event);
      const inNamespace = event !== typeEvent;
      let jQueryEvent = null;
      let bubbles = true;
      let nativeDispatch = true;
      let defaultPrevented = false;

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

      let evt = new Event(event, {
        bubbles,
        cancelable: true
      });
      evt = hydrateObj(evt, args);

      if (defaultPrevented) {
        evt.preventDefault();
      }

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

      if (evt.defaultPrevented && jQueryEvent) {
        jQueryEvent.preventDefault();
      }

      return evt;
    }

  };

  function hydrateObj(obj, meta) {
    for (const [key, value] of Object.entries(meta || {})) {
      try {
        obj[key] = value;
      } catch (_unused) {
        Object.defineProperty(obj, key, {
          configurable: true,

          get() {
            return value;
          }

        });
      }
    }

    return obj;
  }

  return EventHandler;

}));
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