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- (function(factory) {
- if (typeof define === 'function' && define.amd) {
- // AMD. Register as an anonymous module
- define(['jquery'], factory);
- } else if (typeof exports === 'object') {
- // Node/CommonJS
- module.exports = factory(require('jquery'));
- } else {
- // Browser globals
- factory(jQuery);
- }
- })(function($) {
- class DropdownSubmenu {
- constructor(element) {
- this.element = element.parentElement;
- this.menuElement = this.element.querySelector('.dropdown-menu');
- this.init();
- }
- init() {
- $(this.element).off('keydown.bs.dropdown.data-api');
- this.menuElement.addEventListener('keydown', this.itemKeydown.bind(this));
- const dropdownItemNodeList = this.menuElement.querySelectorAll('.dropdown-item');
- for (const element of dropdownItemNodeList) {
- element.addEventListener('keydown', this.handleKeydownDropdownItem.bind(this));
- }
- $(this.menuElement).on('keydown', '.dropdown-submenu > .dropdown-item', this.handleKeydownSubmenuDropdownItem.bind(this));
- $(this.menuElement).on('click', '.dropdown-submenu > .dropdown-item', this.handleClickSubmenuDropdownItem.bind(this));
- $(this.element).on('hidden.bs.dropdown', () => {
- this.close(this.menuElement);
- });
- }
- handleKeydownDropdownItem(event) {
- // 27: Esc
- if (event.keyCode !== 27) {
- return;
- }
- event.target.closest('.dropdown-menu').previousElementSibling.focus();
- event.target.closest('.dropdown-menu').classList.remove('show');
- }
- handleKeydownSubmenuDropdownItem(event) {
- // 32: Spacebar
- if (event.keyCode !== 32) {
- return;
- }
- // NOTE: Off vertical scrolling
- event.preventDefault();
- this.toggle(event.target);
- }
- handleClickSubmenuDropdownItem(event) {
- event.stopPropagation();
- this.toggle(event.target);
- }
- itemKeydown(event) {
- // 38: Arrow up, 40: Arrow down
- if (![38, 40].includes(event.keyCode)) {
- return;
- }
- // NOTE: Off vertical scrolling
- event.preventDefault();
- event.stopPropagation();
- const itemNodeList = this.element.querySelectorAll('.show > .dropdown-item:not(:disabled):not(.disabled), .show > .dropdown > .dropdown-item');
- let index = Array.from(itemNodeList).findIndex((element) => {
- return element === event.target;
- });
- if (event.keyCode === 38 && index !== 0) {
- index--;
- } else if (event.keyCode === 40 && index !== itemNodeList.length - 1) {
- index++;
- } else {
- return;
- }
- itemNodeList[index].focus();
- }
- toggle(element) {
- const dropdownElement = element.closest('.dropdown');
- const parentMenuElement = dropdownElement.closest('.dropdown-menu');
- const menuElement = dropdownElement.querySelector('.dropdown-menu');
- const isOpen = menuElement.classList.contains('show');
- this.close(parentMenuElement);
- menuElement.classList.toggle('show', !isOpen);
- }
- close(menuElement) {
- const menuNodeList = menuElement.querySelectorAll('.dropdown-menu.show');
- for (const element of menuNodeList) {
- element.classList.remove('show');
- }
- }
- }
- // For AMD/Node/CommonJS used elements (optional)
- // http://learn.jquery.com/jquery-ui/environments/amd/
- $.fn.submenupicker = function(elements) {
- const $elements = this instanceof $ ? this : $(elements);
- return $elements.each(function() {
- let data = $.data(this, 'bs.submenu');
- if (!data) {
- data = new DropdownSubmenu(this);
- $.data(this, 'bs.submenu', data);
- }
- });
- };
- return DropdownSubmenu;
- });
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