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Back to Top

Scroll Back To Top Button

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/39499/259015/Back%20to%20Top.js

// ==UserScript==
// @name         Back to Top
// @namespace    https://github.com/maijz128
// @version      0.2
// @description  Scroll Back To Top Button
// @author       MaiJZ
// @grant        none
// ==/UserScript==


(function () {
    'use strict';

    const BUTTON_ID = "btnBackToTop";
    const TOP_FUNCTION_NAME = "btnBackToTop_TopFunction";

    addButtonStyle();
    addFunction();
    addButton();

    function addButtonStyle() {
        var style = '#' + BUTTON_ID + '{';
        style += 'display:none; position:fixed; bottom:20px; right:30px; z-index:99; ';
        style += 'font-size:15px; border:0; outline:0; background-color:#fff; color:#8590a6; ';
        style += 'cursor:pointer; text-align: center; width: 40px; height: 40px; ';
        style += 'border-radius:4px; box-shadow:0 1px 3px rgba(26,26,26,.1); ';
        style += '}';

        style += '#' + BUTTON_ID + ':hover { background-color: #d3d3d3;  }';

        addStyle(style);
    }

    function addFunction() {
        window.addEventListener("scroll", function () {
            var minScrollTop = 50;
            if (document.body.scrollTop > minScrollTop || document.documentElement.scrollTop > minScrollTop) {
                document.getElementById(BUTTON_ID).style.display = "block";
            } else {
                document.getElementById(BUTTON_ID).style.display = "none";
            }
        });

        var strFun = 'function ' + TOP_FUNCTION_NAME + '()';
        // strFun += '{ document.body.scrollTop = 0; document.documentElement.scrollTop = 0;}';
        strFun += '{ var scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight;';
        strFun += 'var increment = scrollHeight / 100;';
        strFun += 'var gotoTop= function(){ var currentPosition = document.documentElement.scrollTop || document.body.scrollTop;';
        strFun += 'currentPosition -= increment; if(currentPosition>0){window.scrollTo(0,currentPosition)}else{window.scrollTo(0,0);clearInterval(timer);timer = null}}; ';
        strFun += 'var timer=setInterval(gotoTop,1); }';

        var elScript = document.createElement("script");
        elScript.innerHTML = strFun;
        document.head.appendChild(elScript);
    }

    function addButton() {
        var strSVG = '<svg class="" title="Back to Top" fill="#8590a6" viewBox="0 0 24 24" width="24" height="24">';
        strSVG += '<path d="M16.036 19.59a1 1 0 0 1-.997.995H9.032a.996.996 0 0 1-.997-.996v-7.005H5.03c-1.1 0-1.36-.633-.578-1.416L11.33 4.29a1.003 1.003 0 0 1 1.412 0l6.878 6.88c.782.78.523 1.415-.58 1.415h-3.004v7.005z"></path></svg>';


        var elButton = document.createElement("button");
        elButton.setAttribute('id', BUTTON_ID);
        elButton.setAttribute("onclick", TOP_FUNCTION_NAME + '()');
        elButton.setAttribute('title', "Back to Top");
        elButton.innerHTML = strSVG;

        document.body.appendChild(elButton);
    }


    function addStyle(styleContent) {
        var elStyle = document.createElement("style");
        elStyle.innerHTML = styleContent;
        document.head.appendChild(elStyle);
    }
})();