1 files changed, 130 insertions, 0 deletions
diff --git a/js/dist/util/focustrap.js b/js/dist/util/focustrap.js
new file mode 100644
index 0000000000..2203046646
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+++ b/js/dist/util/focustrap.js
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+/*!
+  * 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