scroll to top for PC and mobile
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// ==UserScript==
// @name scroll_to_top
// @namespace http://tampermonkey.net/
// @version 0.1.1
// @description scroll to top for PC and mobile
// @author amormaid
// @run-at document-end
// @match http(s)?://*/*
// @include http://*
// @include https://*
// @icon https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
const sttClassName = 'scroll-to-top';
let timeoutID;
function scroll_or_touchmove_handler() {
clearTimeout(timeoutID);
timeoutID = setTimeout(() => {
const btn = (document.getElementsByClassName(sttClassName) || [])[0];
if (btn) {
btn.style.cssText = 'opacity: 1;';
setTimeout(() => {
btn.style.cssText = 'opacity: .1;';
}, 5000)
}
timeoutID = null;
}, 500);
}
function addCSSStyle() {
var cssStyle = document.createElement('style');
cssStyle.type = 'text/css';
cssStyle.textContent = [
'.' + sttClassName + ' {',
' width: 8vw;',
' height: 8vw;',
' line-height: 8vw;',
' text-align: center;',
' background: whiteSmoke;',
' font-weight: bold;',
' font-size: 6vw;',
' color: #444;',
' text-decoration: none;',
' position: fixed;',
' bottom: 0;',
' left: 0;',
' display: block;',
' border: 1px solid grey;',
' border-top-right-radius: 4vw;',
' box-shadow: 0 0 3px grey;',
' transition: opacity 250ms ease-out;',
' opacity: .1;',
' z-index: 1000;',
' cursor: pointer;',
'}'
].join('\n');
if(document.head) {
document.head.appendChild(cssStyle);
}
}
(() => {
if ('ontouchstart' in window) {
window.ontouchmove = scroll_or_touchmove_handler;
} else {
window.onscroll = scroll_or_touchmove_handler;
window.onwheel = function() {
if(typeof timeoutID != 'number') {
return;
}
clearTimeout(timeoutID);
timeoutID = null;
};
}
addCSSStyle();
var div = document.createElement('div');
div.className = sttClassName;
div.textContent = '⇧';
div.onclick = () => window.scrollTo(0, 0);
document.body.appendChild(div);
})();
})();