306 lines
8.4 KiB
JavaScript
306 lines
8.4 KiB
JavaScript
'use strict';
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!function($) {
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/**
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* Equalizer module.
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* @module foundation.equalizer
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*/
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class Equalizer {
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/**
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* Creates a new instance of Equalizer.
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* @class
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* @fires Equalizer#init
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* @param {Object} element - jQuery object to add the trigger to.
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* @param {Object} options - Overrides to the default plugin settings.
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*/
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constructor(element, options){
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this.$element = element;
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this.options = $.extend({}, Equalizer.defaults, this.$element.data(), options);
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this._init();
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Foundation.registerPlugin(this, 'Equalizer');
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}
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/**
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* Initializes the Equalizer plugin and calls functions to get equalizer functioning on load.
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* @private
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*/
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_init() {
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var eqId = this.$element.attr('data-equalizer') || '';
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var $watched = this.$element.find(`[data-equalizer-watch="${eqId}"]`);
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this.$watched = $watched.length ? $watched : this.$element.find('[data-equalizer-watch]');
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this.$element.attr('data-resize', (eqId || Foundation.GetYoDigits(6, 'eq')));
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this.hasNested = this.$element.find('[data-equalizer]').length > 0;
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this.isNested = this.$element.parentsUntil(document.body, '[data-equalizer]').length > 0;
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this.isOn = false;
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this._bindHandler = {
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onResizeMeBound: this._onResizeMe.bind(this),
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onPostEqualizedBound: this._onPostEqualized.bind(this)
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};
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var imgs = this.$element.find('img');
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var tooSmall;
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if(this.options.equalizeOn){
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tooSmall = this._checkMQ();
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$(window).on('changed.zf.mediaquery', this._checkMQ.bind(this));
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}else{
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this._events();
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}
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if((tooSmall !== undefined && tooSmall === false) || tooSmall === undefined){
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if(imgs.length){
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Foundation.onImagesLoaded(imgs, this._reflow.bind(this));
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}else{
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this._reflow();
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}
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}
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}
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/**
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* Removes event listeners if the breakpoint is too small.
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* @private
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*/
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_pauseEvents() {
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this.isOn = false;
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this.$element.off({
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'.zf.equalizer': this._bindHandler.onPostEqualizedBound,
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'resizeme.zf.trigger': this._bindHandler.onResizeMeBound
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});
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}
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/**
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* function to handle $elements resizeme.zf.trigger, with bound this on _bindHandler.onResizeMeBound
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* @private
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*/
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_onResizeMe(e) {
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this._reflow();
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}
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/**
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* function to handle $elements postequalized.zf.equalizer, with bound this on _bindHandler.onPostEqualizedBound
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* @private
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*/
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_onPostEqualized(e) {
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if(e.target !== this.$element[0]){ this._reflow(); }
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}
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/**
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* Initializes events for Equalizer.
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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._pauseEvents();
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if(this.hasNested){
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this.$element.on('postequalized.zf.equalizer', this._bindHandler.onPostEqualizedBound);
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}else{
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this.$element.on('resizeme.zf.trigger', this._bindHandler.onResizeMeBound);
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}
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this.isOn = true;
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}
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/**
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* Checks the current breakpoint to the minimum required size.
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* @private
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*/
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_checkMQ() {
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var tooSmall = !Foundation.MediaQuery.atLeast(this.options.equalizeOn);
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if(tooSmall){
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if(this.isOn){
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this._pauseEvents();
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this.$watched.css('height', 'auto');
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}
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}else{
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if(!this.isOn){
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this._events();
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}
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}
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return tooSmall;
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}
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/**
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* A noop version for the plugin
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* @private
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*/
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_killswitch() {
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return;
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}
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/**
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* Calls necessary functions to update Equalizer upon DOM change
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* @private
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*/
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_reflow() {
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if(!this.options.equalizeOnStack){
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if(this._isStacked()){
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this.$watched.css('height', 'auto');
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return false;
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}
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}
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if (this.options.equalizeByRow) {
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this.getHeightsByRow(this.applyHeightByRow.bind(this));
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}else{
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this.getHeights(this.applyHeight.bind(this));
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}
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}
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/**
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* Manually determines if the first 2 elements are *NOT* stacked.
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* @private
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*/
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_isStacked() {
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return this.$watched[0].getBoundingClientRect().top !== this.$watched[1].getBoundingClientRect().top;
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}
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/**
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* Finds the outer heights of children contained within an Equalizer parent and returns them in an array
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* @param {Function} cb - A non-optional callback to return the heights array to.
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* @returns {Array} heights - An array of heights of children within Equalizer container
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*/
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getHeights(cb) {
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var heights = [];
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for(var i = 0, len = this.$watched.length; i < len; i++){
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this.$watched[i].style.height = 'auto';
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heights.push(this.$watched[i].offsetHeight);
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}
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cb(heights);
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}
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/**
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* Finds the outer heights of children contained within an Equalizer parent and returns them in an array
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* @param {Function} cb - A non-optional callback to return the heights array to.
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* @returns {Array} groups - An array of heights of children within Equalizer container grouped by row with element,height and max as last child
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*/
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getHeightsByRow(cb) {
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var lastElTopOffset = (this.$watched.length ? this.$watched.first().offset().top : 0),
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groups = [],
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group = 0;
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//group by Row
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groups[group] = [];
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for(var i = 0, len = this.$watched.length; i < len; i++){
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this.$watched[i].style.height = 'auto';
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//maybe could use this.$watched[i].offsetTop
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var elOffsetTop = $(this.$watched[i]).offset().top;
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if (elOffsetTop!=lastElTopOffset) {
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group++;
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groups[group] = [];
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lastElTopOffset=elOffsetTop;
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}
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groups[group].push([this.$watched[i],this.$watched[i].offsetHeight]);
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}
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for (var j = 0, ln = groups.length; j < ln; j++) {
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var heights = $(groups[j]).map(function(){ return this[1]; }).get();
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var max = Math.max.apply(null, heights);
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groups[j].push(max);
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}
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cb(groups);
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}
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/**
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* Changes the CSS height property of each child in an Equalizer parent to match the tallest
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* @param {array} heights - An array of heights of children within Equalizer container
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* @fires Equalizer#preequalized
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* @fires Equalizer#postequalized
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*/
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applyHeight(heights) {
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var max = Math.max.apply(null, heights);
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/**
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* Fires before the heights are applied
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* @event Equalizer#preequalized
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*/
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this.$element.trigger('preequalized.zf.equalizer');
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this.$watched.css('height', max);
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/**
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* Fires when the heights have been applied
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* @event Equalizer#postequalized
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*/
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this.$element.trigger('postequalized.zf.equalizer');
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}
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/**
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* Changes the CSS height property of each child in an Equalizer parent to match the tallest by row
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* @param {array} groups - An array of heights of children within Equalizer container grouped by row with element,height and max as last child
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* @fires Equalizer#preequalized
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* @fires Equalizer#preequalizedRow
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* @fires Equalizer#postequalizedRow
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* @fires Equalizer#postequalized
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*/
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applyHeightByRow(groups) {
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/**
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* Fires before the heights are applied
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*/
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this.$element.trigger('preequalized.zf.equalizer');
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for (var i = 0, len = groups.length; i < len ; i++) {
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var groupsILength = groups[i].length,
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max = groups[i][groupsILength - 1];
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if (groupsILength<=2) {
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$(groups[i][0][0]).css({'height':'auto'});
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continue;
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}
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/**
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* Fires before the heights per row are applied
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* @event Equalizer#preequalizedRow
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*/
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this.$element.trigger('preequalizedrow.zf.equalizer');
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for (var j = 0, lenJ = (groupsILength-1); j < lenJ ; j++) {
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$(groups[i][j][0]).css({'height':max});
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}
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/**
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* Fires when the heights per row have been applied
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* @event Equalizer#postequalizedRow
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*/
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this.$element.trigger('postequalizedrow.zf.equalizer');
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}
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/**
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* Fires when the heights have been applied
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*/
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this.$element.trigger('postequalized.zf.equalizer');
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}
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/**
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* Destroys an instance of Equalizer.
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* @function
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*/
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destroy() {
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this._pauseEvents();
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this.$watched.css('height', 'auto');
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Foundation.unregisterPlugin(this);
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}
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}
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/**
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* Default settings for plugin
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*/
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Equalizer.defaults = {
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/**
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* Enable height equalization when stacked on smaller screens.
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* @option
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* @example true
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*/
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equalizeOnStack: true,
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/**
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* Enable height equalization row by row.
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* @option
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* @example false
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*/
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equalizeByRow: false,
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/**
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* String representing the minimum breakpoint size the plugin should equalize heights on.
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* @option
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* @example 'medium'
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*/
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equalizeOn: ''
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};
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// Window exports
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Foundation.plugin(Equalizer, 'Equalizer');
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}(jQuery);
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