643 lines
20 KiB
JavaScript
643 lines
20 KiB
JavaScript
'use strict';
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import $ from 'jquery';
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import { Keyboard } from './foundation.util.keyboard';
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import { Nest } from './foundation.util.nest';
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import { GetYoDigits, transitionend } from './foundation.core.utils';
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import { Box } from './foundation.util.box';
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import { Plugin } from './foundation.core.plugin';
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/**
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* Drilldown module.
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* @module foundation.drilldown
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* @requires foundation.util.keyboard
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* @requires foundation.util.nest
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* @requires foundation.util.box
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*/
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class Drilldown extends Plugin {
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/**
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* Creates a new instance of a drilldown menu.
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* @class
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* @name Drilldown
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* @param {jQuery} element - jQuery object to make into an accordion menu.
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* @param {Object} options - Overrides to the default plugin settings.
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*/
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_setup(element, options) {
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this.$element = element;
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this.options = $.extend({}, Drilldown.defaults, this.$element.data(), options);
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this.className = 'Drilldown'; // ie9 back compat
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this._init();
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Keyboard.register('Drilldown', {
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'ENTER': 'open',
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'SPACE': 'open',
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'ARROW_RIGHT': 'next',
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'ARROW_UP': 'up',
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'ARROW_DOWN': 'down',
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'ARROW_LEFT': 'previous',
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'ESCAPE': 'close',
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'TAB': 'down',
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'SHIFT_TAB': 'up'
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});
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}
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/**
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* Initializes the drilldown by creating jQuery collections of elements
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* @private
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*/
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_init() {
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Nest.Feather(this.$element, 'drilldown');
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if(this.options.autoApplyClass) {
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this.$element.addClass('drilldown');
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}
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this.$element.attr({
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'role': 'tree',
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'aria-multiselectable': false
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});
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this.$submenuAnchors = this.$element.find('li.is-drilldown-submenu-parent').children('a');
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this.$submenus = this.$submenuAnchors.parent('li').children('[data-submenu]').attr('role', 'group');
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this.$menuItems = this.$element.find('li').not('.js-drilldown-back').attr('role', 'treeitem').find('a');
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// Set the main menu as current by default (unless a submenu is selected)
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// Used to set the wrapper height when the drilldown is closed/reopened from any (sub)menu
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this.$currentMenu = this.$element;
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this.$element.attr('data-mutate', (this.$element.attr('data-drilldown') || GetYoDigits(6, 'drilldown')));
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this._prepareMenu();
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this._registerEvents();
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this._keyboardEvents();
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}
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/**
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* prepares drilldown menu by setting attributes to links and elements
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* sets a min height to prevent content jumping
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* wraps the element if not already wrapped
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* @private
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* @function
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*/
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_prepareMenu() {
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var _this = this;
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// if(!this.options.holdOpen){
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// this._menuLinkEvents();
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// }
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this.$submenuAnchors.each(function(){
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var $link = $(this);
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var $sub = $link.parent();
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if(_this.options.parentLink){
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$link.clone().prependTo($sub.children('[data-submenu]')).wrap('<li data-is-parent-link class="is-submenu-parent-item is-submenu-item is-drilldown-submenu-item" role="menuitem"></li>');
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}
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$link.data('savedHref', $link.attr('href')).removeAttr('href').attr('tabindex', 0);
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$link.children('[data-submenu]')
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.attr({
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'aria-hidden': true,
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'tabindex': 0,
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'role': 'group'
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});
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_this._events($link);
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});
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this.$submenus.each(function(){
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var $menu = $(this),
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$back = $menu.find('.js-drilldown-back');
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if(!$back.length){
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switch (_this.options.backButtonPosition) {
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case "bottom":
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$menu.append(_this.options.backButton);
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break;
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case "top":
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$menu.prepend(_this.options.backButton);
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break;
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default:
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console.error("Unsupported backButtonPosition value '" + _this.options.backButtonPosition + "'");
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}
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}
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_this._back($menu);
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});
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this.$submenus.addClass('invisible');
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if(!this.options.autoHeight) {
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this.$submenus.addClass('drilldown-submenu-cover-previous');
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}
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// create a wrapper on element if it doesn't exist.
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if(!this.$element.parent().hasClass('is-drilldown')){
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this.$wrapper = $(this.options.wrapper).addClass('is-drilldown');
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if(this.options.animateHeight) this.$wrapper.addClass('animate-height');
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this.$element.wrap(this.$wrapper);
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}
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// set wrapper
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this.$wrapper = this.$element.parent();
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this.$wrapper.css(this._getMaxDims());
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}
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_resize() {
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this.$wrapper.css({'max-width': 'none', 'min-height': 'none'});
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// _getMaxDims has side effects (boo) but calling it should update all other necessary heights & widths
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this.$wrapper.css(this._getMaxDims());
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}
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/**
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* Adds event handlers to elements in the menu.
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* @function
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* @private
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* @param {jQuery} $elem - the current menu item to add handlers to.
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*/
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_events($elem) {
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var _this = this;
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$elem.off('click.zf.drilldown')
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.on('click.zf.drilldown', function(e){
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if($(e.target).parentsUntil('ul', 'li').hasClass('is-drilldown-submenu-parent')){
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e.stopImmediatePropagation();
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e.preventDefault();
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}
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// if(e.target !== e.currentTarget.firstElementChild){
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// return false;
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// }
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_this._show($elem.parent('li'));
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if(_this.options.closeOnClick){
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var $body = $('body');
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$body.off('.zf.drilldown').on('click.zf.drilldown', function(e){
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if (e.target === _this.$element[0] || $.contains(_this.$element[0], e.target)) { return; }
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e.preventDefault();
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_this._hideAll();
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$body.off('.zf.drilldown');
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});
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}
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});
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}
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/**
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* Adds event handlers to the menu element.
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* @function
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* @private
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*/
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_registerEvents() {
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if(this.options.scrollTop){
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this._bindHandler = this._scrollTop.bind(this);
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this.$element.on('open.zf.drilldown hide.zf.drilldown closed.zf.drilldown',this._bindHandler);
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}
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this.$element.on('mutateme.zf.trigger', this._resize.bind(this));
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}
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/**
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* Scroll to Top of Element or data-scroll-top-element
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* @function
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* @fires Drilldown#scrollme
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*/
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_scrollTop() {
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var _this = this;
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var $scrollTopElement = _this.options.scrollTopElement!=''?$(_this.options.scrollTopElement):_this.$element,
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scrollPos = parseInt($scrollTopElement.offset().top+_this.options.scrollTopOffset, 10);
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$('html, body').stop(true).animate({ scrollTop: scrollPos }, _this.options.animationDuration, _this.options.animationEasing,function(){
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/**
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* Fires after the menu has scrolled
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* @event Drilldown#scrollme
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*/
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if(this===$('html')[0])_this.$element.trigger('scrollme.zf.drilldown');
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});
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}
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/**
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* Adds keydown event listener to `li`'s in the menu.
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* @private
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*/
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_keyboardEvents() {
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var _this = this;
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this.$menuItems.add(this.$element.find('.js-drilldown-back > a, .is-submenu-parent-item > a')).on('keydown.zf.drilldown', function(e){
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var $element = $(this),
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$elements = $element.parent('li').parent('ul').children('li').children('a'),
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$prevElement,
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$nextElement;
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$elements.each(function(i) {
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if ($(this).is($element)) {
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$prevElement = $elements.eq(Math.max(0, i-1));
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$nextElement = $elements.eq(Math.min(i+1, $elements.length-1));
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return;
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}
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});
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Keyboard.handleKey(e, 'Drilldown', {
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next: function() {
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if ($element.is(_this.$submenuAnchors)) {
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_this._show($element.parent('li'));
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$element.parent('li').one(transitionend($element), function(){
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$element.parent('li').find('ul li a').not('.js-drilldown-back a').first().focus();
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});
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return true;
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}
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},
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previous: function() {
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_this._hide($element.parent('li').parent('ul'));
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$element.parent('li').parent('ul').one(transitionend($element), function(){
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setTimeout(function() {
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$element.parent('li').parent('ul').parent('li').children('a').first().focus();
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}, 1);
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});
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return true;
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},
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up: function() {
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$prevElement.focus();
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// Don't tap focus on first element in root ul
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return !$element.is(_this.$element.find('> li:first-child > a'));
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},
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down: function() {
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$nextElement.focus();
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// Don't tap focus on last element in root ul
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return !$element.is(_this.$element.find('> li:last-child > a'));
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},
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close: function() {
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// Don't close on element in root ul
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if (!$element.is(_this.$element.find('> li > a'))) {
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_this._hide($element.parent().parent());
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$element.parent().parent().siblings('a').focus();
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}
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},
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open: function() {
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if (_this.options.parentLink && $element.attr('href')) { // Link with href
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return false;
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} else if (!$element.is(_this.$menuItems)) { // not menu item means back button
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_this._hide($element.parent('li').parent('ul'));
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$element.parent('li').parent('ul').one(transitionend($element), function(){
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setTimeout(function() {
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$element.parent('li').parent('ul').parent('li').children('a').first().focus();
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}, 1);
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});
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return true;
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} else if ($element.is(_this.$submenuAnchors)) { // Sub menu item
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_this._show($element.parent('li'));
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$element.parent('li').one(transitionend($element), function(){
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$element.parent('li').find('ul li a').not('.js-drilldown-back a').first().focus();
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});
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return true;
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}
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},
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handled: function(preventDefault) {
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if (preventDefault) {
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e.preventDefault();
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}
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e.stopImmediatePropagation();
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}
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});
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}); // end keyboardAccess
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}
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/**
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* Closes all open elements, and returns to root menu.
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* @function
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* @fires Drilldown#closed
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*/
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_hideAll() {
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var $elem = this.$element.find('.is-drilldown-submenu.is-active').addClass('is-closing');
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if(this.options.autoHeight) this.$wrapper.css({height:$elem.parent().closest('ul').data('calcHeight')});
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$elem.one(transitionend($elem), function(e){
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$elem.removeClass('is-active is-closing');
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});
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/**
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* Fires when the menu is fully closed.
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* @event Drilldown#closed
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*/
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this.$element.trigger('closed.zf.drilldown');
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}
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/**
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* Adds event listener for each `back` button, and closes open menus.
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* @function
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* @fires Drilldown#back
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* @param {jQuery} $elem - the current sub-menu to add `back` event.
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*/
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_back($elem) {
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var _this = this;
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$elem.off('click.zf.drilldown');
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$elem.children('.js-drilldown-back')
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.on('click.zf.drilldown', function(e){
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e.stopImmediatePropagation();
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// console.log('mouseup on back');
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_this._hide($elem);
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// If there is a parent submenu, call show
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let parentSubMenu = $elem.parent('li').parent('ul').parent('li');
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if (parentSubMenu.length) {
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_this._show(parentSubMenu);
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}
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});
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}
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/**
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* Adds event listener to menu items w/o submenus to close open menus on click.
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* @function
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* @private
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*/
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_menuLinkEvents() {
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var _this = this;
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this.$menuItems.not('.is-drilldown-submenu-parent')
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.off('click.zf.drilldown')
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.on('click.zf.drilldown', function(e){
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// e.stopImmediatePropagation();
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setTimeout(function(){
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_this._hideAll();
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}, 0);
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});
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}
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/**
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* Sets the CSS classes for submenu to show it.
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* @function
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* @private
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* @param {jQuery} $elem - the target submenu (`ul` tag)
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* @param {boolean} trigger - trigger drilldown event
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*/
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_setShowSubMenuClasses($elem, trigger) {
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$elem.addClass('is-active').removeClass('invisible').attr('aria-hidden', false);
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$elem.parent('li').attr('aria-expanded', true);
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if (trigger === true) {
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this.$element.trigger('open.zf.drilldown', [$elem]);
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}
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}
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/**
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* Sets the CSS classes for submenu to hide it.
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* @function
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* @private
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* @param {jQuery} $elem - the target submenu (`ul` tag)
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* @param {boolean} trigger - trigger drilldown event
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*/
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_setHideSubMenuClasses($elem, trigger) {
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$elem.removeClass('is-active').addClass('invisible').attr('aria-hidden', true);
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$elem.parent('li').attr('aria-expanded', false);
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if (trigger === true) {
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$elem.trigger('hide.zf.drilldown', [$elem]);
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}
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}
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/**
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* Opens a specific drilldown (sub)menu no matter which (sub)menu in it is currently visible.
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* Compared to _show() this lets you jump into any submenu without clicking through every submenu on the way to it.
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* @function
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* @fires Drilldown#open
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* @param {jQuery} $elem - the target (sub)menu (`ul` tag)
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* @param {boolean} autoFocus - if true the first link in the target (sub)menu gets auto focused
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*/
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_showMenu($elem, autoFocus) {
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var _this = this;
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// Reset drilldown
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var $expandedSubmenus = this.$element.find('li[aria-expanded="true"] > ul[data-submenu]');
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$expandedSubmenus.each(function(index) {
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_this._setHideSubMenuClasses($(this));
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});
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// Save the menu as the currently displayed one.
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this.$currentMenu = $elem;
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// If target menu is root, focus first link & exit
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if ($elem.is('[data-drilldown]')) {
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if (autoFocus === true) $elem.find('li[role="treeitem"] > a').first().focus();
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if (this.options.autoHeight) this.$wrapper.css('height', $elem.data('calcHeight'));
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return;
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}
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// Find all submenus on way to root incl. the element itself
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var $submenus = $elem.children().first().parentsUntil('[data-drilldown]', '[data-submenu]');
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// Open target menu and all submenus on its way to root
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$submenus.each(function(index) {
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// Update height of first child (target menu) if autoHeight option true
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if (index === 0 && _this.options.autoHeight) {
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_this.$wrapper.css('height', $(this).data('calcHeight'));
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}
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var isLastChild = index == $submenus.length - 1;
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// Add transitionsend listener to last child (root due to reverse order) to open target menu's first link
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// Last child makes sure the event gets always triggered even if going through several menus
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if (isLastChild === true) {
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$(this).one(transitionend($(this)), () => {
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if (autoFocus === true) {
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$elem.find('li[role="treeitem"] > a').first().focus();
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}
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});
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}
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_this._setShowSubMenuClasses($(this), isLastChild);
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});
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}
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/**
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* Opens a submenu.
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* @function
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* @fires Drilldown#open
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* @param {jQuery} $elem - the current element with a submenu to open, i.e. the `li` tag.
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*/
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_show($elem) {
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const $submenu = $elem.children('[data-submenu]');
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$elem.attr('aria-expanded', true);
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this.$currentMenu = $submenu;
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$submenu.addClass('is-active').removeClass('invisible').attr('aria-hidden', false);
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if (this.options.autoHeight) {
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this.$wrapper.css({ height: $submenu.data('calcHeight') });
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}
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/**
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* Fires when the submenu has opened.
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* @event Drilldown#open
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*/
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this.$element.trigger('open.zf.drilldown', [$elem]);
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}
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/**
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* Hides a submenu
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* @function
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* @fires Drilldown#hide
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* @param {jQuery} $elem - the current sub-menu to hide, i.e. the `ul` tag.
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*/
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_hide($elem) {
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if(this.options.autoHeight) this.$wrapper.css({height:$elem.parent().closest('ul').data('calcHeight')});
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var _this = this;
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$elem.parent('li').attr('aria-expanded', false);
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$elem.attr('aria-hidden', true);
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$elem.addClass('is-closing')
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.one(transitionend($elem), function(){
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$elem.removeClass('is-active is-closing');
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$elem.blur().addClass('invisible');
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});
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/**
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* Fires when the submenu has closed.
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* @event Drilldown#hide
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*/
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$elem.trigger('hide.zf.drilldown', [$elem]);
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}
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/**
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* Iterates through the nested menus to calculate the min-height, and max-width for the menu.
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* Prevents content jumping.
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* @function
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* @private
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*/
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_getMaxDims() {
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var maxHeight = 0, result = {}, _this = this;
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// Recalculate menu heights and total max height
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this.$submenus.add(this.$element).each(function(){
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var numOfElems = $(this).children('li').length;
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var height = Box.GetDimensions(this).height;
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|
|
|
maxHeight = height > maxHeight ? height : maxHeight;
|
|
|
|
if(_this.options.autoHeight) {
|
|
$(this).data('calcHeight',height);
|
|
}
|
|
});
|
|
|
|
if (this.options.autoHeight)
|
|
result['height'] = this.$currentMenu.data('calcHeight');
|
|
else
|
|
result['min-height'] = `${maxHeight}px`;
|
|
|
|
result['max-width'] = `${this.$element[0].getBoundingClientRect().width}px`;
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Destroys the Drilldown Menu
|
|
* @function
|
|
*/
|
|
_destroy() {
|
|
if(this.options.scrollTop) this.$element.off('.zf.drilldown',this._bindHandler);
|
|
this._hideAll();
|
|
this.$element.off('mutateme.zf.trigger');
|
|
Nest.Burn(this.$element, 'drilldown');
|
|
this.$element.unwrap()
|
|
.find('.js-drilldown-back, .is-submenu-parent-item').remove()
|
|
.end().find('.is-active, .is-closing, .is-drilldown-submenu').removeClass('is-active is-closing is-drilldown-submenu')
|
|
.end().find('[data-submenu]').removeAttr('aria-hidden tabindex role');
|
|
this.$submenuAnchors.each(function() {
|
|
$(this).off('.zf.drilldown');
|
|
});
|
|
|
|
this.$element.find('[data-is-parent-link]').detach();
|
|
this.$submenus.removeClass('drilldown-submenu-cover-previous invisible');
|
|
|
|
this.$element.find('a').each(function(){
|
|
var $link = $(this);
|
|
$link.removeAttr('tabindex');
|
|
if($link.data('savedHref')){
|
|
$link.attr('href', $link.data('savedHref')).removeData('savedHref');
|
|
}else{ return; }
|
|
});
|
|
};
|
|
}
|
|
|
|
Drilldown.defaults = {
|
|
/**
|
|
* Drilldowns depend on styles in order to function properly; in the default build of Foundation these are
|
|
* on the `drilldown` class. This option auto-applies this class to the drilldown upon initialization.
|
|
* @option
|
|
* @type {boolian}
|
|
* @default true
|
|
*/
|
|
autoApplyClass: true,
|
|
/**
|
|
* Markup used for JS generated back button. Prepended or appended (see backButtonPosition) to submenu lists and deleted on `destroy` method, 'js-drilldown-back' class required. Remove the backslash (`\`) if copy and pasting.
|
|
* @option
|
|
* @type {string}
|
|
* @default '<li class="js-drilldown-back"><a tabindex="0">Back</a></li>'
|
|
*/
|
|
backButton: '<li class="js-drilldown-back"><a tabindex="0">Back</a></li>',
|
|
/**
|
|
* Position the back button either at the top or bottom of drilldown submenus. Can be `'left'` or `'bottom'`.
|
|
* @option
|
|
* @type {string}
|
|
* @default top
|
|
*/
|
|
backButtonPosition: 'top',
|
|
/**
|
|
* Markup used to wrap drilldown menu. Use a class name for independent styling; the JS applied class: `is-drilldown` is required. Remove the backslash (`\`) if copy and pasting.
|
|
* @option
|
|
* @type {string}
|
|
* @default '<div></div>'
|
|
*/
|
|
wrapper: '<div></div>',
|
|
/**
|
|
* Adds the parent link to the submenu.
|
|
* @option
|
|
* @type {boolean}
|
|
* @default false
|
|
*/
|
|
parentLink: false,
|
|
/**
|
|
* Allow the menu to return to root list on body click.
|
|
* @option
|
|
* @type {boolean}
|
|
* @default false
|
|
*/
|
|
closeOnClick: false,
|
|
/**
|
|
* Allow the menu to auto adjust height.
|
|
* @option
|
|
* @type {boolean}
|
|
* @default false
|
|
*/
|
|
autoHeight: false,
|
|
/**
|
|
* Animate the auto adjust height.
|
|
* @option
|
|
* @type {boolean}
|
|
* @default false
|
|
*/
|
|
animateHeight: false,
|
|
/**
|
|
* Scroll to the top of the menu after opening a submenu or navigating back using the menu back button
|
|
* @option
|
|
* @type {boolean}
|
|
* @default false
|
|
*/
|
|
scrollTop: false,
|
|
/**
|
|
* String jquery selector (for example 'body') of element to take offset().top from, if empty string the drilldown menu offset().top is taken
|
|
* @option
|
|
* @type {string}
|
|
* @default ''
|
|
*/
|
|
scrollTopElement: '',
|
|
/**
|
|
* ScrollTop offset
|
|
* @option
|
|
* @type {number}
|
|
* @default 0
|
|
*/
|
|
scrollTopOffset: 0,
|
|
/**
|
|
* Scroll animation duration
|
|
* @option
|
|
* @type {number}
|
|
* @default 500
|
|
*/
|
|
animationDuration: 500,
|
|
/**
|
|
* Scroll animation easing. Can be `'swing'` or `'linear'`.
|
|
* @option
|
|
* @type {string}
|
|
* @see {@link https://api.jquery.com/animate|JQuery animate}
|
|
* @default 'swing'
|
|
*/
|
|
animationEasing: 'swing'
|
|
// holdOpen: false
|
|
};
|
|
|
|
export {Drilldown};
|