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/*!
* swiped-events.js - v@version@
* Pure JavaScript swipe events
* https://github.com/john-doherty/swiped-events
* @inspiration https://stackoverflow.com/questions/16348031/disable-scrolling-when-touch-moving-certain-element
* @author John Doherty <www.johndoherty.info>
* @license MIT
*/
(function (window, document) {
'use strict';
// patch CustomEvent to allow constructor creation (IE/Chrome)
if (typeof window.CustomEvent !== 'function') {
window.CustomEvent = function (event, params) {
params = params || { bubbles: false, cancelable: false, detail: undefined };
var evt = document.createEvent('CustomEvent');
evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
return evt;
};
window.CustomEvent.prototype = window.Event.prototype;
}
document.addEventListener('touchstart', handleTouchStart, false);
document.addEventListener('touchmove', handleTouchMove, false);
document.addEventListener('touchend', handleTouchEnd, false);
var xDown = null;
var yDown = null;
var xDiff = null;
var yDiff = null;
var timeDown = null;
var startEl = null;
/**
* Fires swiped event if swipe detected on touchend
* @param {object} e - browser event object
* @returns {void}
*/
function handleTouchEnd(e) {
// if the user released on a different target, cancel!
if (startEl !== e.target) return;
var swipeThreshold = parseInt(getNearestAttribute(startEl, 'data-swipe-threshold', '20'), 10); // default 20 units
var swipeUnit = getNearestAttribute(startEl, 'data-swipe-unit', 'px'); // default px
var swipeTimeout = parseInt(getNearestAttribute(startEl, 'data-swipe-timeout', '500'), 10); // default 500ms
var timeDiff = Date.now() - timeDown;
var eventType = '';
var changedTouches = e.changedTouches || e.touches || [];
if (swipeUnit === 'vh') {
swipeThreshold = Math.round((swipeThreshold / 100) * document.documentElement.clientHeight); // get percentage of viewport height in pixels
}
if (swipeUnit === 'vw') {
swipeThreshold = Math.round((swipeThreshold / 100) * document.documentElement.clientWidth); // get percentage of viewport height in pixels
}
if (Math.abs(xDiff) > Math.abs(yDiff)) { // most significant
if (Math.abs(xDiff) > swipeThreshold && timeDiff < swipeTimeout) {
if (xDiff > 0) {
eventType = 'swiped-left';
}
else {
eventType = 'swiped-right';
}
}
}
else if (Math.abs(yDiff) > swipeThreshold && timeDiff < swipeTimeout) {
if (yDiff > 0) {
eventType = 'swiped-up';
}
else {
eventType = 'swiped-down';
}
}
if (eventType !== '') {
var eventData = {
dir: eventType.replace(/swiped-/, ''),
touchType: (changedTouches[0] || {}).touchType || 'direct',
xStart: parseInt(xDown, 10),
xEnd: parseInt((changedTouches[0] || {}).clientX || -1, 10),
yStart: parseInt(yDown, 10),
yEnd: parseInt((changedTouches[0] || {}).clientY || -1, 10)
};
// fire `swiped` event event on the element that started the swipe
startEl.dispatchEvent(new CustomEvent('swiped', { bubbles: true, cancelable: true, detail: eventData }));
// fire `swiped-dir` event on the element that started the swipe
startEl.dispatchEvent(new CustomEvent(eventType, { bubbles: true, cancelable: true, detail: eventData }));
}
// reset values
xDown = null;
yDown = null;
timeDown = null;
}
/**
* Records current location on touchstart event
* @param {object} e - browser event object
* @returns {void}
*/
function handleTouchStart(e) {
// if the element has data-swipe-ignore="true" we stop listening for swipe events
if (e.target.getAttribute('data-swipe-ignore') === 'true') return;
startEl = e.target;
timeDown = Date.now();
xDown = e.touches[0].clientX;
yDown = e.touches[0].clientY;
xDiff = 0;
yDiff = 0;
}
/**
* Records location diff in px on touchmove event
* @param {object} e - browser event object
* @returns {void}
*/
function handleTouchMove(e) {
if (!xDown || !yDown) return;
var xUp = e.touches[0].clientX;
var yUp = e.touches[0].clientY;
xDiff = xDown - xUp;
yDiff = yDown - yUp;
}
/**
* Gets attribute off HTML element or nearest parent
* @param {object} el - HTML element to retrieve attribute from
* @param {string} attributeName - name of the attribute
* @param {any} defaultValue - default value to return if no match found
* @returns {any} attribute value or defaultValue
*/
function getNearestAttribute(el, attributeName, defaultValue) {
// walk up the dom tree looking for attributeName
while (el && el !== document.documentElement) {
var attributeValue = el.getAttribute(attributeName);
if (attributeValue) {
return attributeValue;
}
el = el.parentNode;
}
return defaultValue;
}
}(window, document));
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