410 lines
12 KiB
JavaScript
410 lines
12 KiB
JavaScript
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'use strict';
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!function($) {
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/**
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* Dropdown module.
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* @module foundation.dropdown
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* @requires foundation.util.keyboard
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* @requires foundation.util.box
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* @requires foundation.util.triggers
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*/
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class Dropdown {
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/**
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* Creates a new instance of a dropdown.
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* @class
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* @param {jQuery} element - jQuery object to make into a dropdown.
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* Object should be of the dropdown panel, rather than its anchor.
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* @param {Object} options - Overrides to the default plugin settings.
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*/
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constructor(element, options) {
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this.$element = element;
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this.options = $.extend({}, Dropdown.defaults, this.$element.data(), options);
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this._init();
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Foundation.registerPlugin(this, 'Dropdown');
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Foundation.Keyboard.register('Dropdown', {
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'ENTER': 'open',
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'SPACE': 'open',
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'ESCAPE': 'close',
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'TAB': 'tab_forward',
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'SHIFT_TAB': 'tab_backward'
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});
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}
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/**
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* Initializes the plugin by setting/checking options and attributes, adding helper variables, and saving the anchor.
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* @function
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* @private
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*/
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_init() {
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var $id = this.$element.attr('id');
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this.$anchor = $(`[data-toggle="${$id}"]`) || $(`[data-open="${$id}"]`);
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this.$anchor.attr({
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'aria-controls': $id,
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'data-is-focus': false,
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'data-yeti-box': $id,
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'aria-haspopup': true,
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'aria-expanded': false
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});
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this.options.positionClass = this.getPositionClass();
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this.counter = 4;
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this.usedPositions = [];
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this.$element.attr({
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'aria-hidden': 'true',
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'data-yeti-box': $id,
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'data-resize': $id,
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'aria-labelledby': this.$anchor[0].id || Foundation.GetYoDigits(6, 'dd-anchor')
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});
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this._events();
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}
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/**
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* Helper function to determine current orientation of dropdown pane.
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* @function
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* @returns {String} position - string value of a position class.
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*/
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getPositionClass() {
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var verticalPosition = this.$element[0].className.match(/(top|left|right|bottom)/g);
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verticalPosition = verticalPosition ? verticalPosition[0] : '';
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var horizontalPosition = /float-(\S+)\s/.exec(this.$anchor[0].className);
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horizontalPosition = horizontalPosition ? horizontalPosition[1] : '';
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var position = horizontalPosition ? horizontalPosition + ' ' + verticalPosition : verticalPosition;
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return position;
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}
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/**
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* Adjusts the dropdown panes orientation by adding/removing positioning classes.
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* @function
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* @private
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* @param {String} position - position class to remove.
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*/
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_reposition(position) {
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this.usedPositions.push(position ? position : 'bottom');
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//default, try switching to opposite side
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if(!position && (this.usedPositions.indexOf('top') < 0)){
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this.$element.addClass('top');
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}else if(position === 'top' && (this.usedPositions.indexOf('bottom') < 0)){
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this.$element.removeClass(position);
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}else if(position === 'left' && (this.usedPositions.indexOf('right') < 0)){
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this.$element.removeClass(position)
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.addClass('right');
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}else if(position === 'right' && (this.usedPositions.indexOf('left') < 0)){
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this.$element.removeClass(position)
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.addClass('left');
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}
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//if default change didn't work, try bottom or left first
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else if(!position && (this.usedPositions.indexOf('top') > -1) && (this.usedPositions.indexOf('left') < 0)){
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this.$element.addClass('left');
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}else if(position === 'top' && (this.usedPositions.indexOf('bottom') > -1) && (this.usedPositions.indexOf('left') < 0)){
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this.$element.removeClass(position)
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.addClass('left');
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}else if(position === 'left' && (this.usedPositions.indexOf('right') > -1) && (this.usedPositions.indexOf('bottom') < 0)){
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this.$element.removeClass(position);
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}else if(position === 'right' && (this.usedPositions.indexOf('left') > -1) && (this.usedPositions.indexOf('bottom') < 0)){
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this.$element.removeClass(position);
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}
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//if nothing cleared, set to bottom
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else{
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this.$element.removeClass(position);
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}
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this.classChanged = true;
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this.counter--;
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}
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/**
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* Sets the position and orientation of the dropdown pane, checks for collisions.
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* Recursively calls itself if a collision is detected, with a new position class.
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* @function
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* @private
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*/
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_setPosition() {
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if(this.$anchor.attr('aria-expanded') === 'false'){ return false; }
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var position = this.getPositionClass(),
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$eleDims = Foundation.Box.GetDimensions(this.$element),
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$anchorDims = Foundation.Box.GetDimensions(this.$anchor),
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_this = this,
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direction = (position === 'left' ? 'left' : ((position === 'right') ? 'left' : 'top')),
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param = (direction === 'top') ? 'height' : 'width',
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offset = (param === 'height') ? this.options.vOffset : this.options.hOffset;
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if(($eleDims.width >= $eleDims.windowDims.width) || (!this.counter && !Foundation.Box.ImNotTouchingYou(this.$element))){
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this.$element.offset(Foundation.Box.GetOffsets(this.$element, this.$anchor, 'center bottom', this.options.vOffset, this.options.hOffset, true)).css({
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'width': $eleDims.windowDims.width - (this.options.hOffset * 2),
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'height': 'auto'
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});
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this.classChanged = true;
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return false;
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}
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this.$element.offset(Foundation.Box.GetOffsets(this.$element, this.$anchor, position, this.options.vOffset, this.options.hOffset));
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while(!Foundation.Box.ImNotTouchingYou(this.$element, false, true) && this.counter){
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this._reposition(position);
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this._setPosition();
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}
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}
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/**
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* Adds event listeners to the element utilizing the triggers utility library.
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* @function
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* @private
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*/
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_events() {
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var _this = this;
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this.$element.on({
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'open.zf.trigger': this.open.bind(this),
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'close.zf.trigger': this.close.bind(this),
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'toggle.zf.trigger': this.toggle.bind(this),
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'resizeme.zf.trigger': this._setPosition.bind(this)
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});
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if(this.options.hover){
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this.$anchor.off('mouseenter.zf.dropdown mouseleave.zf.dropdown')
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.on('mouseenter.zf.dropdown', function(){
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clearTimeout(_this.timeout);
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_this.timeout = setTimeout(function(){
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_this.open();
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_this.$anchor.data('hover', true);
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}, _this.options.hoverDelay);
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}).on('mouseleave.zf.dropdown', function(){
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clearTimeout(_this.timeout);
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_this.timeout = setTimeout(function(){
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_this.close();
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_this.$anchor.data('hover', false);
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}, _this.options.hoverDelay);
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});
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if(this.options.hoverPane){
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this.$element.off('mouseenter.zf.dropdown mouseleave.zf.dropdown')
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.on('mouseenter.zf.dropdown', function(){
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clearTimeout(_this.timeout);
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}).on('mouseleave.zf.dropdown', function(){
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clearTimeout(_this.timeout);
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_this.timeout = setTimeout(function(){
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_this.close();
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_this.$anchor.data('hover', false);
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}, _this.options.hoverDelay);
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});
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}
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}
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this.$anchor.add(this.$element).on('keydown.zf.dropdown', function(e) {
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var $target = $(this),
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visibleFocusableElements = Foundation.Keyboard.findFocusable(_this.$element);
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Foundation.Keyboard.handleKey(e, 'Dropdown', {
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tab_forward: function() {
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if (_this.$element.find(':focus').is(visibleFocusableElements.eq(-1))) { // left modal downwards, setting focus to first element
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if (_this.options.trapFocus) { // if focus shall be trapped
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visibleFocusableElements.eq(0).focus();
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e.preventDefault();
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} else { // if focus is not trapped, close dropdown on focus out
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_this.close();
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}
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}
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},
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tab_backward: function() {
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if (_this.$element.find(':focus').is(visibleFocusableElements.eq(0)) || _this.$element.is(':focus')) { // left modal upwards, setting focus to last element
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if (_this.options.trapFocus) { // if focus shall be trapped
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visibleFocusableElements.eq(-1).focus();
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e.preventDefault();
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} else { // if focus is not trapped, close dropdown on focus out
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_this.close();
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}
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}
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},
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open: function() {
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if ($target.is(_this.$anchor)) {
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_this.open();
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_this.$element.attr('tabindex', -1).focus();
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e.preventDefault();
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}
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},
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close: function() {
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_this.close();
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_this.$anchor.focus();
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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 an event handler to the body to close any dropdowns on a click.
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* @function
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* @private
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*/
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_addBodyHandler() {
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var $body = $(document.body).not(this.$element),
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_this = this;
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$body.off('click.zf.dropdown')
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.on('click.zf.dropdown', function(e){
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if(_this.$anchor.is(e.target) || _this.$anchor.find(e.target).length) {
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return;
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}
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if(_this.$element.find(e.target).length) {
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return;
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}
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_this.close();
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$body.off('click.zf.dropdown');
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});
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}
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/**
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* Opens the dropdown pane, and fires a bubbling event to close other dropdowns.
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* @function
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* @fires Dropdown#closeme
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* @fires Dropdown#show
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*/
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open() {
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// var _this = this;
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/**
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* Fires to close other open dropdowns
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* @event Dropdown#closeme
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*/
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this.$element.trigger('closeme.zf.dropdown', this.$element.attr('id'));
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this.$anchor.addClass('hover')
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.attr({'aria-expanded': true});
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// this.$element/*.show()*/;
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this._setPosition();
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this.$element.addClass('is-open')
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.attr({'aria-hidden': false});
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if(this.options.autoFocus){
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var $focusable = Foundation.Keyboard.findFocusable(this.$element);
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if($focusable.length){
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$focusable.eq(0).focus();
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}
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}
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if(this.options.closeOnClick){ this._addBodyHandler(); }
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/**
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* Fires once the dropdown is visible.
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* @event Dropdown#show
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*/
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this.$element.trigger('show.zf.dropdown', [this.$element]);
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}
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/**
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* Closes the open dropdown pane.
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* @function
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* @fires Dropdown#hide
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*/
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close() {
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if(!this.$element.hasClass('is-open')){
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return false;
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}
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this.$element.removeClass('is-open')
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.attr({'aria-hidden': true});
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this.$anchor.removeClass('hover')
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.attr('aria-expanded', false);
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if(this.classChanged){
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var curPositionClass = this.getPositionClass();
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if(curPositionClass){
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this.$element.removeClass(curPositionClass);
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}
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this.$element.addClass(this.options.positionClass)
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/*.hide()*/.css({height: '', width: ''});
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this.classChanged = false;
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this.counter = 4;
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this.usedPositions.length = 0;
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}
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this.$element.trigger('hide.zf.dropdown', [this.$element]);
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}
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/**
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* Toggles the dropdown pane's visibility.
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* @function
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*/
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toggle() {
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if(this.$element.hasClass('is-open')){
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if(this.$anchor.data('hover')) return;
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this.close();
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}else{
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this.open();
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}
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}
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/**
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* Destroys the dropdown.
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* @function
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*/
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destroy() {
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this.$element.off('.zf.trigger').hide();
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this.$anchor.off('.zf.dropdown');
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Foundation.unregisterPlugin(this);
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}
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}
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Dropdown.defaults = {
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/**
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* Amount of time to delay opening a submenu on hover event.
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* @option
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* @example 250
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*/
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hoverDelay: 250,
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/**
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* Allow submenus to open on hover events
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* @option
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* @example false
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*/
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hover: false,
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/**
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* Don't close dropdown when hovering over dropdown pane
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* @option
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* @example true
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*/
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hoverPane: false,
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/**
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* Number of pixels between the dropdown pane and the triggering element on open.
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* @option
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* @example 1
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*/
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vOffset: 1,
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/**
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* Number of pixels between the dropdown pane and the triggering element on open.
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* @option
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* @example 1
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*/
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hOffset: 1,
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/**
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|
|
* Class applied to adjust open position. JS will test and fill this in.
|
||
|
|
* @option
|
||
|
|
* @example 'top'
|
||
|
|
*/
|
||
|
|
positionClass: '',
|
||
|
|
/**
|
||
|
|
* Allow the plugin to trap focus to the dropdown pane if opened with keyboard commands.
|
||
|
|
* @option
|
||
|
|
* @example false
|
||
|
|
*/
|
||
|
|
trapFocus: false,
|
||
|
|
/**
|
||
|
|
* Allow the plugin to set focus to the first focusable element within the pane, regardless of method of opening.
|
||
|
|
* @option
|
||
|
|
* @example true
|
||
|
|
*/
|
||
|
|
autoFocus: false,
|
||
|
|
/**
|
||
|
|
* Allows a click on the body to close the dropdown.
|
||
|
|
* @option
|
||
|
|
* @example false
|
||
|
|
*/
|
||
|
|
closeOnClick: false
|
||
|
|
}
|
||
|
|
|
||
|
|
// Window exports
|
||
|
|
Foundation.plugin(Dropdown, 'Dropdown');
|
||
|
|
|
||
|
|
}(jQuery);
|