370 lines
11 KiB
JavaScript
370 lines
11 KiB
JavaScript
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'use strict';
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!function($) {
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/**
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* Drilldown module.
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* @module foundation.drilldown
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* @requires foundation.util.keyboard
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* @requires foundation.util.motion
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* @requires foundation.util.nest
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*/
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class Drilldown {
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/**
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* Creates a new instance of a drilldown menu.
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* @class
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* @param {jQuery} element - jQuery object to make into an accordion menu.
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* @param {Object} options - Overrides to the default plugin settings.
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*/
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constructor(element, options) {
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this.$element = element;
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this.options = $.extend({}, Drilldown.defaults, this.$element.data(), options);
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Foundation.Nest.Feather(this.$element, 'drilldown');
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this._init();
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Foundation.registerPlugin(this, 'Drilldown');
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Foundation.Keyboard.register('Drilldown', {
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'ENTER': 'open',
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'SPACE': 'open',
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'ARROW_RIGHT': 'next',
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'ARROW_UP': 'up',
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'ARROW_DOWN': 'down',
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'ARROW_LEFT': 'previous',
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'ESCAPE': 'close',
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'TAB': 'down',
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'SHIFT_TAB': 'up'
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});
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}
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/**
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* Initializes the drilldown by creating jQuery collections of elements
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* @private
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*/
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_init() {
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this.$submenuAnchors = this.$element.find('li.is-drilldown-submenu-parent').children('a');
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this.$submenus = this.$submenuAnchors.parent('li').children('[data-submenu]');
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this.$menuItems = this.$element.find('li').not('.js-drilldown-back').attr('role', 'menuitem').find('a');
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this._prepareMenu();
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this._keyboardEvents();
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}
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/**
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* prepares drilldown menu by setting attributes to links and elements
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* sets a min height to prevent content jumping
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* wraps the element if not already wrapped
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* @private
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* @function
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*/
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_prepareMenu() {
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var _this = this;
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// if(!this.options.holdOpen){
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// this._menuLinkEvents();
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// }
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this.$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($sub.children('[data-submenu]')).wrap('<li class="is-submenu-parent-item is-submenu-item is-drilldown-submenu-item" role="menu-item"></li>');
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}
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$link.data('savedHref', $link.attr('href')).removeAttr('href');
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$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': 'menu'
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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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$menu.prepend(_this.options.backButton);
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}
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_this._back($menu);
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});
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if(!this.$element.parent().hasClass('is-drilldown')){
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this.$wrapper = $(this.options.wrapper).addClass('is-drilldown');
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this.$wrapper = this.$element.wrap(this.$wrapper).parent().css(this._getMaxDims());
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}
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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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$body.off('.zf.drilldown');
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});
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}
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});
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}
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/**
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* Adds keydown event listener to `li`'s in the menu.
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* @private
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*/
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_keyboardEvents() {
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var _this = this;
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this.$menuItems.add(this.$element.find('.js-drilldown-back > a')).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, $elements.length-1));
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return;
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}
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});
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Foundation.Keyboard.handleKey(e, 'Drilldown', {
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next: function() {
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if ($element.is(_this.$submenuAnchors)) {
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_this._show($element.parent('li'));
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$element.parent('li').one(Foundation.transitionend($element), function(){
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$element.parent('li').find('ul li a').filter(_this.$menuItems).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(Foundation.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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$prevElement.focus();
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return true;
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},
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down: function() {
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$nextElement.focus();
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return true;
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},
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close: function() {
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_this._back();
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//_this.$menuItems.first().focus(); // focus to first element
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},
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open: function() {
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if (!$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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$element.parent('li').parent('ul').one(Foundation.transitionend($element), function(){
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setTimeout(function() {
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$element.parent('li').parent('ul').parent('li').children('a').first().focus();
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}, 1);
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});
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} else if ($element.is(_this.$submenuAnchors)) {
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_this._show($element.parent('li'));
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$element.parent('li').one(Foundation.transitionend($element), function(){
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$element.parent('li').find('ul li a').filter(_this.$menuItems).first().focus();
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});
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}
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return true;
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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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$elem.one(Foundation.transitionend($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($elem);
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});
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}
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/**
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* Adds event listener to menu items w/o submenus to close open menus on click.
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* @function
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* @private
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*/
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_menuLinkEvents() {
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var _this = this;
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this.$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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* 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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$elem.children('[data-submenu]').addClass('is-active');
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/**
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* Fires when the submenu has opened.
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* @event Drilldown#open
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*/
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this.$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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var _this = this;
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$elem.addClass('is-closing')
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.one(Foundation.transitionend($elem), function(){
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$elem.removeClass('is-active is-closing');
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$elem.blur();
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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 max = 0, result = {};
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this.$submenus.add(this.$element).each(function(){
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var numOfElems = $(this).children('li').length;
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max = numOfElems > max ? numOfElems : max;
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});
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result['min-height'] = `${max * this.$menuItems[0].getBoundingClientRect().height}px`;
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result['max-width'] = `${this.$element[0].getBoundingClientRect().width}px`;
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return result;
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}
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/**
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* Destroys the Drilldown Menu
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* @function
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*/
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destroy() {
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this._hideAll();
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Foundation.Nest.Burn(this.$element, 'drilldown');
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this.$element.unwrap()
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.find('.js-drilldown-back, .is-submenu-parent-item').remove()
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.end().find('.is-active, .is-closing, .is-drilldown-submenu').removeClass('is-active is-closing is-drilldown-submenu')
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.end().find('[data-submenu]').removeAttr('aria-hidden tabindex role');
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this.$submenuAnchors.each(function() {
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$(this).off('.zf.drilldown');
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});
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this.$element.find('a').each(function(){
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var $link = $(this);
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if($link.data('savedHref')){
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$link.attr('href', $link.data('savedHref')).removeData('savedHref');
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}else{ return; }
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});
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Foundation.unregisterPlugin(this);
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};
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}
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Drilldown.defaults = {
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/**
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* Markup used for JS generated back button. Prepended to submenu lists and deleted on `destroy` method, 'js-drilldown-back' class required. Remove the backslash (`\`) if copy and pasting.
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* @option
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* @example '<\li><\a>Back<\/a><\/li>'
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*/
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backButton: '<li class="js-drilldown-back"><a tabindex="0">Back</a></li>',
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/**
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* 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.
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* @option
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* @example '<\div class="is-drilldown"><\/div>'
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*/
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wrapper: '<div></div>',
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/**
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* Adds the parent link to the submenu.
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* @option
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* @example false
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*/
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parentLink: false,
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/**
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* Allow the menu to return to root list on body click.
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* @option
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* @example false
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*/
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closeOnClick: false
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// holdOpen: false
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};
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// Window exports
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Foundation.plugin(Drilldown, 'Drilldown');
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}(jQuery);
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