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Viewing file:     focustrap.js (3.82 KB)      -rwxrwxr-x

/*!
  * Bootstrap focustrap.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('../dom/event-handler'), require('../dom/selector-engine'), require('./config')) :
  typeof define === 'function' && define.amd ? define(['../dom/event-handler', '../dom/selector-engine', './config'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Focustrap = factory(global.EventHandler, global.SelectorEngine, global.Config));
})(this, (function (EventHandler, SelectorEngine, Config) { 'use strict';

  const _interopDefaultLegacy = e => e && typeof e === 'object' && 'default' in e ? e : { default: e };

  const EventHandler__default = /*#__PURE__*/_interopDefaultLegacy(EventHandler);
  const SelectorEngine__default = /*#__PURE__*/_interopDefaultLegacy(SelectorEngine);
  const Config__default = /*#__PURE__*/_interopDefaultLegacy(Config);

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

  const NAME = 'focustrap';
  const DATA_KEY = 'bs.focustrap';
  const EVENT_KEY = `.${DATA_KEY}`;
  const EVENT_FOCUSIN = `focusin${EVENT_KEY}`;
  const EVENT_KEYDOWN_TAB = `keydown.tab${EVENT_KEY}`;
  const TAB_KEY = 'Tab';
  const TAB_NAV_FORWARD = 'forward';
  const TAB_NAV_BACKWARD = 'backward';
  const Default = {
    autofocus: true,
    trapElement: null // The element to trap focus inside of

  };
  const DefaultType = {
    autofocus: 'boolean',
    trapElement: 'element'
  };
  /**
   * Class definition
   */

  class FocusTrap extends Config__default.default {
    constructor(config) {
      super();
      this._config = this._getConfig(config);
      this._isActive = false;
      this._lastTabNavDirection = null;
    } // Getters


    static get Default() {
      return Default;
    }

    static get DefaultType() {
      return DefaultType;
    }

    static get NAME() {
      return NAME;
    } // Public


    activate() {
      if (this._isActive) {
        return;
      }

      if (this._config.autofocus) {
        this._config.trapElement.focus();
      }

      EventHandler__default.default.off(document, EVENT_KEY); // guard against infinite focus loop

      EventHandler__default.default.on(document, EVENT_FOCUSIN, event => this._handleFocusin(event));
      EventHandler__default.default.on(document, EVENT_KEYDOWN_TAB, event => this._handleKeydown(event));
      this._isActive = true;
    }

    deactivate() {
      if (!this._isActive) {
        return;
      }

      this._isActive = false;
      EventHandler__default.default.off(document, EVENT_KEY);
    } // Private


    _handleFocusin(event) {
      const {
        trapElement
      } = this._config;

      if (event.target === document || event.target === trapElement || trapElement.contains(event.target)) {
        return;
      }

      const elements = SelectorEngine__default.default.focusableChildren(trapElement);

      if (elements.length === 0) {
        trapElement.focus();
      } else if (this._lastTabNavDirection === TAB_NAV_BACKWARD) {
        elements[elements.length - 1].focus();
      } else {
        elements[0].focus();
      }
    }

    _handleKeydown(event) {
      if (event.key !== TAB_KEY) {
        return;
      }

      this._lastTabNavDirection = event.shiftKey ? TAB_NAV_BACKWARD : TAB_NAV_FORWARD;
    }

  }

  return FocusTrap;

}));
//# sourceMappingURL=focustrap.js.map