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lc-swiper.js
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lc-swiper.js
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/**
* lc-js-events.js - Micro vanilla javascript (ES6) class making swipe events easy!
* Version: v1.0
* Author: Luca Montanari aka LCweb
* Website: https://lcweb.it
* Licensed under the MIT license
*/
(function() {
"use strict";
/* prevent multiple script inits */
if(typeof(window.lc_swiper) == 'function') {
return true;
}
/* plugin class */
window.lc_swiper = function(attachTo, callback) {
if(!attachTo) {
return console.error('You must provide a valid selector or DOM object as first argument');
}
if(typeof(callback) != 'function') {
return console.error('please use a valid callback');
}
this.$elements = [];
this.uniqid = Math.random().toString(36).substr(2, 9);
/* get elements to attach event to */
this.get_elems = function(selector) {
if(typeof(selector) != 'string') {
return (selector instanceof Element) ? [selector] : Object.values(selector);
}
// clean problematic selectors
(selector.match(/(#[0-9][^\s:,]*)/g) || []).forEach(function(n) {
selector = selector.replace(n, '[id="' + n.replace("#", "") + '"]');
});
return document.querySelectorAll(selector);
};
/* initialize touch tracking */
this.init = function() {
const $this = this;
this.$elements = this.get_elems(attachTo);
this.$elements.forEach(function($el) {
// cache trick for easy destruction
if(typeof($el.lcswiper_cb) == 'undefined') {
$el.lcswiper_cb = {};
}
$el.lcswiper_cb[ $this.uniqid ] = callback;
// track first touch
$el.addEventListener('touchstart', (e) => {
$el.lcswiper_xDown = e.touches[0].clientX;
$el.lcswiper_yDown = e.touches[0].clientY;
});
// track touch end
$el.addEventListener('touchend', (e) => {
$this.handleTouchDiff($el, e);
});
});
};
/* handle touchend values and eventually triggers callback passing directions object and $el */
this.handleTouchDiff = function($el, e) {
if(
typeof($el.lcswiper_xDown) == 'undefined' || !$el.lcswiper_xDown ||
typeof($el.lcswiper_yDown) == 'undefined' || !$el.lcswiper_yDown ||
typeof($el.lcswiper_cb[ this.uniqid ]) == 'undefined'
) {
return;
}
const xUp = e.changedTouches[0].clientX,
yUp = e.changedTouches[0].clientY,
xDiff = parseInt($el.lcswiper_xDown - xUp, 10),
yDiff = parseInt($el.lcswiper_yDown - yUp, 10);
if(Math.abs(xDiff) !== 0 || Math.abs(yDiff) !== 0) {
const to_return = {
up : (yDiff > 0) ? yDiff : 0,
right : (xDiff < 0) ? Math.abs(xDiff) : 0,
down : (yDiff < 0) ? Math.abs(yDiff) : 0,
left : (xDiff > 0) ? xDiff : 0,
};
$el.lcswiper_cb[ this.uniqid ].call(this, to_return, $el);
}
// reset
$el.lcswiper_xDown = 0;
$el.lcswiper_yDown = 0;
};
/* destroy public method to stop tracking event with specific callback */
this.destroy = function(spec_elems) {
const $this = this,
$to_destroy = (!spec_elems) ? this.$elements : this.get_elems(spec_elems);
$to_destroy.forEach(function($el) {
if(typeof($el.lcswiper_cb) != 'undefined' && typeof($el.lcswiper_cb[ $this.uniqid ]) != 'undefined') {
delete $el.lcswiper_cb[ $this.uniqid ];
}
});
};
// init and return class
this.init();
return this;
};
})();