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