ProfessionalWiki / Bootstrap

resources/bootstrap/js/carousel.js

/*!
  * Bootstrap carousel.js v4.6.2 (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('jquery'), require('./util.js')) :
  typeof define === 'function' && define.amd ? define(['jquery', './util'], factory) :

The variable define seems to be never declared. If this is a global, consider adding a /** global: define */ comment.

  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Carousel = factory(global.jQuery, global.Util));

The variable globalThis seems to be never declared. If this is a global, consider adding a /** global: globalThis */ comment.

If you intend to check if the variable self is declared in the current environment, consider using typeof self === "undefined" instead. This is safe if the variable is not actually declared.

Usage of the sequence operator is discouraged, since it may lead to obfuscated code.

})(this, (function ($, Util) { 'use strict';

  function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

  var $__default = /*#__PURE__*/_interopDefaultLegacy($);
  var Util__default = /*#__PURE__*/_interopDefaultLegacy(Util);

  function _defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

    if (staticProps) _defineProperties(Constructor, staticProps);

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

    Object.defineProperty(Constructor, "prototype", {
      writable: false
    });
    return Constructor;
  }

  function _extends() {
    _extends = Object.assign ? Object.assign.bind() : function (target) {

It seems like you are trying to overwrite a function name here. _extends is already defined in line 36 as a function. While this will work, it can be very confusing.

      for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i];

        for (var key in source) {

A for in loop automatically includes the property of any prototype object, consider checking the key using hasOwnProperty.

          if (Object.prototype.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }

      return target;
    };
    return _extends.apply(this, arguments);
  }

  /**
   * Constants
   */

  var NAME = 'carousel';
  var VERSION = '4.6.2';
  var DATA_KEY = 'bs.carousel';
  var EVENT_KEY = "." + DATA_KEY;
  var DATA_API_KEY = '.data-api';
  var JQUERY_NO_CONFLICT = $__default["default"].fn[NAME];
  var ARROW_LEFT_KEYCODE = 37; // KeyboardEvent.which value for left arrow key

  var ARROW_RIGHT_KEYCODE = 39; // KeyboardEvent.which value for right arrow key

  var TOUCHEVENT_COMPAT_WAIT = 500; // Time for mouse compat events to fire after touch

  var SWIPE_THRESHOLD = 40;
  var CLASS_NAME_CAROUSEL = 'carousel';
  var CLASS_NAME_ACTIVE = 'active';
  var CLASS_NAME_SLIDE = 'slide';
  var CLASS_NAME_RIGHT = 'carousel-item-right';
  var CLASS_NAME_LEFT = 'carousel-item-left';
  var CLASS_NAME_NEXT = 'carousel-item-next';
  var CLASS_NAME_PREV = 'carousel-item-prev';
  var CLASS_NAME_POINTER_EVENT = 'pointer-event';
  var DIRECTION_NEXT = 'next';
  var DIRECTION_PREV = 'prev';
  var DIRECTION_LEFT = 'left';
  var DIRECTION_RIGHT = 'right';
  var EVENT_SLIDE = "slide" + EVENT_KEY;
  var EVENT_SLID = "slid" + EVENT_KEY;
  var EVENT_KEYDOWN = "keydown" + EVENT_KEY;
  var EVENT_MOUSEENTER = "mouseenter" + EVENT_KEY;
  var EVENT_MOUSELEAVE = "mouseleave" + EVENT_KEY;
  var EVENT_TOUCHSTART = "touchstart" + EVENT_KEY;
  var EVENT_TOUCHMOVE = "touchmove" + EVENT_KEY;
  var EVENT_TOUCHEND = "touchend" + EVENT_KEY;
  var EVENT_POINTERDOWN = "pointerdown" + EVENT_KEY;
  var EVENT_POINTERUP = "pointerup" + EVENT_KEY;
  var EVENT_DRAG_START = "dragstart" + EVENT_KEY;
  var EVENT_LOAD_DATA_API = "load" + EVENT_KEY + DATA_API_KEY;
  var EVENT_CLICK_DATA_API = "click" + EVENT_KEY + DATA_API_KEY;
  var SELECTOR_ACTIVE = '.active';
  var SELECTOR_ACTIVE_ITEM = '.active.carousel-item';
  var SELECTOR_ITEM = '.carousel-item';
  var SELECTOR_ITEM_IMG = '.carousel-item img';
  var SELECTOR_NEXT_PREV = '.carousel-item-next, .carousel-item-prev';
  var SELECTOR_INDICATORS = '.carousel-indicators';
  var SELECTOR_DATA_SLIDE = '[data-slide], [data-slide-to]';
  var SELECTOR_DATA_RIDE = '[data-ride="carousel"]';
  var Default = {
    interval: 5000,
    keyboard: true,
    slide: false,
    pause: 'hover',
    wrap: true,
    touch: true
  };
  var DefaultType = {
    interval: '(number|boolean)',
    keyboard: 'boolean',
    slide: '(boolean|string)',
    pause: '(string|boolean)',
    wrap: 'boolean',
    touch: 'boolean'
  };
  var PointerType = {
    TOUCH: 'touch',
    PEN: 'pen'
  };
  /**
   * Class definition
   */

  var Carousel = /*#__PURE__*/function () {
    function Carousel(element, config) {
      this._items = null;
      this._interval = null;
      this._activeElement = null;
      this._isPaused = false;
      this._isSliding = false;
      this.touchTimeout = null;
      this.touchStartX = 0;
      this.touchDeltaX = 0;
      this._config = this._getConfig(config);
      this._element = element;
      this._indicatorsElement = this._element.querySelector(SELECTOR_INDICATORS);
      this._touchSupported = 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0;

The variable navigator seems to be never declared. If this is a global, consider adding a /** global: navigator */ comment.

      this._pointerEvent = Boolean(window.PointerEvent || window.MSPointerEvent);

      this._addEventListeners();
    } // Getters


    var _proto = Carousel.prototype;

    // Public
    _proto.next = function next() {
      if (!this._isSliding) {
        this._slide(DIRECTION_NEXT);
      }
    };

    _proto.nextWhenVisible = function nextWhenVisible() {
      var $element = $__default["default"](this._element); // Don't call next when the page isn't visible
      // or the carousel or its parent isn't visible

      if (!document.hidden && $element.is(':visible') && $element.css('visibility') !== 'hidden') {
        this.next();
      }
    };

    _proto.prev = function prev() {
      if (!this._isSliding) {
        this._slide(DIRECTION_PREV);
      }
    };

    _proto.pause = function pause(event) {
      if (!event) {
        this._isPaused = true;
      }

      if (this._element.querySelector(SELECTOR_NEXT_PREV)) {
        Util__default["default"].triggerTransitionEnd(this._element);
        this.cycle(true);
      }

      clearInterval(this._interval);
      this._interval = null;
    };

    _proto.cycle = function cycle(event) {
      if (!event) {
        this._isPaused = false;
      }

      if (this._interval) {
        clearInterval(this._interval);
        this._interval = null;
      }

      if (this._config.interval && !this._isPaused) {
        this._updateInterval();

        this._interval = setInterval((document.visibilityState ? this.nextWhenVisible : this.next).bind(this), this._config.interval);
      }
    };

    _proto.to = function to(index) {
      var _this = this;

      this._activeElement = this._element.querySelector(SELECTOR_ACTIVE_ITEM);

      var activeIndex = this._getItemIndex(this._activeElement);

      if (index > this._items.length - 1 || index < 0) {
        return;
      }

      if (this._isSliding) {
        $__default["default"](this._element).one(EVENT_SLID, function () {
          return _this.to(index);
        });
        return;
      }

      if (activeIndex === index) {
        this.pause();
        this.cycle();
        return;
      }

      var direction = index > activeIndex ? DIRECTION_NEXT : DIRECTION_PREV;

      this._slide(direction, this._items[index]);
    };

    _proto.dispose = function dispose() {
      $__default["default"](this._element).off(EVENT_KEY);
      $__default["default"].removeData(this._element, DATA_KEY);
      this._items = null;
      this._config = null;
      this._element = null;
      this._interval = null;
      this._isPaused = null;
      this._isSliding = null;
      this._activeElement = null;
      this._indicatorsElement = null;
    } // Private
    ;

    _proto._getConfig = function _getConfig(config) {
      config = _extends({}, Default, config);
      Util__default["default"].typeCheckConfig(NAME, config, DefaultType);
      return config;
    };

    _proto._handleSwipe = function _handleSwipe() {
      var absDeltax = Math.abs(this.touchDeltaX);

      if (absDeltax <= SWIPE_THRESHOLD) {
        return;
      }

      var direction = absDeltax / this.touchDeltaX;
      this.touchDeltaX = 0; // swipe left

      if (direction > 0) {
        this.prev();
      } // swipe right


      if (direction < 0) {
        this.next();
      }
    };

    _proto._addEventListeners = function _addEventListeners() {
      var _this2 = this;

      if (this._config.keyboard) {
        $__default["default"](this._element).on(EVENT_KEYDOWN, function (event) {
          return _this2._keydown(event);
        });
      }

      if (this._config.pause === 'hover') {
        $__default["default"](this._element).on(EVENT_MOUSEENTER, function (event) {
          return _this2.pause(event);
        }).on(EVENT_MOUSELEAVE, function (event) {
          return _this2.cycle(event);
        });
      }

      if (this._config.touch) {
        this._addTouchEventListeners();
      }
    };

    _proto._addTouchEventListeners = function _addTouchEventListeners() {
      var _this3 = this;

      if (!this._touchSupported) {
        return;
      }

      var start = function start(event) {
        if (_this3._pointerEvent && PointerType[event.originalEvent.pointerType.toUpperCase()]) {
          _this3.touchStartX = event.originalEvent.clientX;
        } else if (!_this3._pointerEvent) {
          _this3.touchStartX = event.originalEvent.touches[0].clientX;
        }
      };

      var move = function move(event) {
        // ensure swiping with one touch and not pinching
        _this3.touchDeltaX = event.originalEvent.touches && event.originalEvent.touches.length > 1 ? 0 : event.originalEvent.touches[0].clientX - _this3.touchStartX;
      };

      var end = function end(event) {
        if (_this3._pointerEvent && PointerType[event.originalEvent.pointerType.toUpperCase()]) {
          _this3.touchDeltaX = event.originalEvent.clientX - _this3.touchStartX;
        }

        _this3._handleSwipe();

        if (_this3._config.pause === 'hover') {
          // If it's a touch-enabled device, mouseenter/leave are fired as
          // part of the mouse compatibility events on first tap - the carousel
          // would stop cycling until user tapped out of it;
          // here, we listen for touchend, explicitly pause the carousel
          // (as if it's the second time we tap on it, mouseenter compat event
          // is NOT fired) and after a timeout (to allow for mouse compatibility
          // events to fire) we explicitly restart cycling
          _this3.pause();

          if (_this3.touchTimeout) {
            clearTimeout(_this3.touchTimeout);
          }

          _this3.touchTimeout = setTimeout(function (event) {
            return _this3.cycle(event);
          }, TOUCHEVENT_COMPAT_WAIT + _this3._config.interval);
        }
      };

      $__default["default"](this._element.querySelectorAll(SELECTOR_ITEM_IMG)).on(EVENT_DRAG_START, function (e) {
        return e.preventDefault();
      });

      if (this._pointerEvent) {
        $__default["default"](this._element).on(EVENT_POINTERDOWN, function (event) {
          return start(event);
        });
        $__default["default"](this._element).on(EVENT_POINTERUP, function (event) {
          return end(event);
        });

        this._element.classList.add(CLASS_NAME_POINTER_EVENT);
      } else {
        $__default["default"](this._element).on(EVENT_TOUCHSTART, function (event) {
          return start(event);
        });
        $__default["default"](this._element).on(EVENT_TOUCHMOVE, function (event) {
          return move(event);
        });
        $__default["default"](this._element).on(EVENT_TOUCHEND, function (event) {
          return end(event);
        });
      }
    };

    _proto._keydown = function _keydown(event) {
      if (/input|textarea/i.test(event.target.tagName)) {
        return;
      }

      switch (event.which) {
        case ARROW_LEFT_KEYCODE:
          event.preventDefault();
          this.prev();
          break;

        case ARROW_RIGHT_KEYCODE:
          event.preventDefault();
          this.next();
          break;
      }
    };

    _proto._getItemIndex = function _getItemIndex(element) {
      this._items = element && element.parentNode ? [].slice.call(element.parentNode.querySelectorAll(SELECTOR_ITEM)) : [];
      return this._items.indexOf(element);
    };

    _proto._getItemByDirection = function _getItemByDirection(direction, activeElement) {
      var isNextDirection = direction === DIRECTION_NEXT;
      var isPrevDirection = direction === DIRECTION_PREV;

      var activeIndex = this._getItemIndex(activeElement);

      var lastItemIndex = this._items.length - 1;
      var isGoingToWrap = isPrevDirection && activeIndex === 0 || isNextDirection && activeIndex === lastItemIndex;

      if (isGoingToWrap && !this._config.wrap) {
        return activeElement;
      }

      var delta = direction === DIRECTION_PREV ? -1 : 1;
      var itemIndex = (activeIndex + delta) % this._items.length;
      return itemIndex === -1 ? this._items[this._items.length - 1] : this._items[itemIndex];
    };

    _proto._triggerSlideEvent = function _triggerSlideEvent(relatedTarget, eventDirectionName) {
      var targetIndex = this._getItemIndex(relatedTarget);

      var fromIndex = this._getItemIndex(this._element.querySelector(SELECTOR_ACTIVE_ITEM));

      var slideEvent = $__default["default"].Event(EVENT_SLIDE, {
        relatedTarget: relatedTarget,
        direction: eventDirectionName,
        from: fromIndex,
        to: targetIndex
      });
      $__default["default"](this._element).trigger(slideEvent);
      return slideEvent;
    };

    _proto._setActiveIndicatorElement = function _setActiveIndicatorElement(element) {
      if (this._indicatorsElement) {
        var indicators = [].slice.call(this._indicatorsElement.querySelectorAll(SELECTOR_ACTIVE));
        $__default["default"](indicators).removeClass(CLASS_NAME_ACTIVE);

        var nextIndicator = this._indicatorsElement.children[this._getItemIndex(element)];

        if (nextIndicator) {
          $__default["default"](nextIndicator).addClass(CLASS_NAME_ACTIVE);
        }
      }
    };

    _proto._updateInterval = function _updateInterval() {
      var element = this._activeElement || this._element.querySelector(SELECTOR_ACTIVE_ITEM);

      if (!element) {
        return;
      }

      var elementInterval = parseInt(element.getAttribute('data-interval'), 10);

      if (elementInterval) {
        this._config.defaultInterval = this._config.defaultInterval || this._config.interval;
        this._config.interval = elementInterval;
      } else {
        this._config.interval = this._config.defaultInterval || this._config.interval;
      }
    };

    _proto._slide = function _slide(direction, element) {
      var _this4 = this;

      var activeElement = this._element.querySelector(SELECTOR_ACTIVE_ITEM);

      var activeElementIndex = this._getItemIndex(activeElement);

      var nextElement = element || activeElement && this._getItemByDirection(direction, activeElement);

      var nextElementIndex = this._getItemIndex(nextElement);

      var isCycling = Boolean(this._interval);
      var directionalClassName;
      var orderClassName;
      var eventDirectionName;

      if (direction === DIRECTION_NEXT) {
        directionalClassName = CLASS_NAME_LEFT;
        orderClassName = CLASS_NAME_NEXT;
        eventDirectionName = DIRECTION_LEFT;
      } else {
        directionalClassName = CLASS_NAME_RIGHT;
        orderClassName = CLASS_NAME_PREV;
        eventDirectionName = DIRECTION_RIGHT;
      }

      if (nextElement && $__default["default"](nextElement).hasClass(CLASS_NAME_ACTIVE)) {
        this._isSliding = false;
        return;
      }

      var slideEvent = this._triggerSlideEvent(nextElement, eventDirectionName);

      if (slideEvent.isDefaultPrevented()) {
        return;
      }

      if (!activeElement || !nextElement) {
        // Some weirdness is happening, so we bail
        return;
      }

      this._isSliding = true;

      if (isCycling) {
        this.pause();
      }

      this._setActiveIndicatorElement(nextElement);

      this._activeElement = nextElement;
      var slidEvent = $__default["default"].Event(EVENT_SLID, {
        relatedTarget: nextElement,
        direction: eventDirectionName,
        from: activeElementIndex,
        to: nextElementIndex
      });

      if ($__default["default"](this._element).hasClass(CLASS_NAME_SLIDE)) {
        $__default["default"](nextElement).addClass(orderClassName);
        Util__default["default"].reflow(nextElement);
        $__default["default"](activeElement).addClass(directionalClassName);
        $__default["default"](nextElement).addClass(directionalClassName);
        var transitionDuration = Util__default["default"].getTransitionDurationFromElement(activeElement);
        $__default["default"](activeElement).one(Util__default["default"].TRANSITION_END, function () {
          $__default["default"](nextElement).removeClass(directionalClassName + " " + orderClassName).addClass(CLASS_NAME_ACTIVE);
          $__default["default"](activeElement).removeClass(CLASS_NAME_ACTIVE + " " + orderClassName + " " + directionalClassName);
          _this4._isSliding = false;
          setTimeout(function () {
            return $__default["default"](_this4._element).trigger(slidEvent);
          }, 0);
        }).emulateTransitionEnd(transitionDuration);
      } else {
        $__default["default"](activeElement).removeClass(CLASS_NAME_ACTIVE);
        $__default["default"](nextElement).addClass(CLASS_NAME_ACTIVE);
        this._isSliding = false;
        $__default["default"](this._element).trigger(slidEvent);
      }

      if (isCycling) {
        this.cycle();
      }
    } // Static
    ;

    Carousel._jQueryInterface = function _jQueryInterface(config) {
      return this.each(function () {
        var data = $__default["default"](this).data(DATA_KEY);

        var _config = _extends({}, Default, $__default["default"](this).data());

        if (typeof config === 'object') {
          _config = _extends({}, _config, config);
        }

        var action = typeof config === 'string' ? config : _config.slide;

        if (!data) {
          data = new Carousel(this, _config);
          $__default["default"](this).data(DATA_KEY, data);
        }

        if (typeof config === 'number') {
          data.to(config);
        } else if (typeof action === 'string') {
          if (typeof data[action] === 'undefined') {
            throw new TypeError("No method named \"" + action + "\"");
          }

          data[action]();
        } else if (_config.interval && _config.ride) {
          data.pause();
          data.cycle();
        }
      });
    };

    Carousel._dataApiClickHandler = function _dataApiClickHandler(event) {
      var selector = Util__default["default"].getSelectorFromElement(this);

      if (!selector) {
        return;
      }

      var target = $__default["default"](selector)[0];

      if (!target || !$__default["default"](target).hasClass(CLASS_NAME_CAROUSEL)) {
        return;
      }

      var config = _extends({}, $__default["default"](target).data(), $__default["default"](this).data());

      var slideIndex = this.getAttribute('data-slide-to');

      if (slideIndex) {
        config.interval = false;
      }

      Carousel._jQueryInterface.call($__default["default"](target), config);

      if (slideIndex) {
        $__default["default"](target).data(DATA_KEY).to(slideIndex);
      }

      event.preventDefault();
    };

    _createClass(Carousel, null, [{
      key: "VERSION",
      get: function get() {
        return VERSION;
      }
    }, {
      key: "Default",
      get: function get() {
        return Default;
      }
    }]);

    return Carousel;
  }();
  /**
   * Data API implementation
   */


  $__default["default"](document).on(EVENT_CLICK_DATA_API, SELECTOR_DATA_SLIDE, Carousel._dataApiClickHandler);
  $__default["default"](window).on(EVENT_LOAD_DATA_API, function () {
    var carousels = [].slice.call(document.querySelectorAll(SELECTOR_DATA_RIDE));

    for (var i = 0, len = carousels.length; i < len; i++) {
      var $carousel = $__default["default"](carousels[i]);

      Carousel._jQueryInterface.call($carousel, $carousel.data());
    }
  });
  /**
   * jQuery
   */

  $__default["default"].fn[NAME] = Carousel._jQueryInterface;
  $__default["default"].fn[NAME].Constructor = Carousel;

  $__default["default"].fn[NAME].noConflict = function () {
    $__default["default"].fn[NAME] = JQUERY_NO_CONFLICT;
    return Carousel._jQueryInterface;
  };

  return Carousel;

}));
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