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137 lines
3.5 KiB
JavaScript
137 lines
3.5 KiB
JavaScript
'use strict';
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var Shuffle = window.Shuffle;
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class Demo {
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constructor(element) {
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this.shapes = Array.from(document.querySelectorAll('.js-shapes input'));
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this.colors = Array.from(document.querySelectorAll('.js-colors button'));
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this.shuffle = new Shuffle(element, {
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easing: 'cubic-bezier(0.165, 0.840, 0.440, 1.000)',
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sizer: '.the-sizer',
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});
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this.filters = {
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shapes: [],
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colors: [],
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};
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this._bindEventListeners();
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}
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/**
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* Bind event listeners for when the filters change.
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*/
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_bindEventListeners() {
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this._onShapeChange = this._handleShapeChange.bind(this);
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this._onColorChange = this._handleColorChange.bind(this);
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this.shapes.forEach((input) => {
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input.addEventListener('change', this._onShapeChange);
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}, this);
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this.colors.forEach((button) => {
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button.addEventListener('click', this._onColorChange);
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}, this);
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}
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/**
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* Get the values of each checked input.
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* @return {Array.<string>}
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*/
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_getCurrentShapeFilters() {
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return this.shapes.filter((input) => input.checked).map((input) => input.value);
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}
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/**
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* Get the values of each `active` button.
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* @return {Array.<string>}
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*/
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_getCurrentColorFilters() {
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return this.colors
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.filter((button) => button.classList.contains('active'))
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.map((button) => button.getAttribute('data-value'));
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}
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/**
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* A shape input check state changed, update the current filters and filte.r
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*/
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_handleShapeChange() {
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this.filters.shapes = this._getCurrentShapeFilters();
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this.filter();
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}
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/**
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* A color button was clicked. Update filters and display.
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* @param {Event} evt Click event object.
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*/
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_handleColorChange(evt) {
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var button = evt.currentTarget;
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// Treat these buttons like radio buttons where only 1 can be selected.
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if (button.classList.contains('active')) {
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button.classList.remove('active');
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} else {
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this.colors.forEach((btn) => {
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btn.classList.remove('active');
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});
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button.classList.add('active');
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}
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this.filters.colors = this._getCurrentColorFilters();
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this.filter();
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}
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/**
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* Filter shuffle based on the current state of filters.
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*/
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filter() {
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if (this.hasActiveFilters()) {
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this.shuffle.filter(this.itemPassesFilters.bind(this));
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} else {
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this.shuffle.filter(Shuffle.ALL_ITEMS);
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}
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}
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/**
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* If any of the arrays in the `filters` property have a length of more than zero,
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* that means there is an active filter.
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* @return {boolean}
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*/
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hasActiveFilters() {
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return Object.keys(this.filters).some((key) => {
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return this.filters[key].length > 0;
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}, this);
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}
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/**
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* Determine whether an element passes the current filters.
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* @param {Element} element Element to test.
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* @return {boolean} Whether it satisfies all current filters.
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*/
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itemPassesFilters(element) {
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var shapes = this.filters.shapes;
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var colors = this.filters.colors;
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var shape = element.getAttribute('data-shape');
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var color = element.getAttribute('data-color');
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// If there are active shape filters and this shape is not in that array.
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if (shapes.length > 0 && !shapes.includes(shape)) {
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return false;
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}
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// If there are active color filters and this color is not in that array.
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if (colors.length > 0 && !colors.includes(color)) {
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return false;
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}
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return true;
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}
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}
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document.addEventListener('DOMContentLoaded', () => {
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window.demo = new Demo(document.querySelector('.js-shuffle'));
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});
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