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Go to Top

Scroll Back To Top Button

Version vom 15.03.2018. Aktuellste Version

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/39499/258716/Go%20to%20Top.js 

// ==UserScript==
// @name         Go to Top
// @namespace    https://github.com/maijz128
// @version      0.1
// @description  Scroll Back To Top Button
// @author       MaiJZ
// @grant        none
// ==/UserScript==


(function () {
    'use strict';

    const BUTTON_ID = "btnScrollToTop";
    const TOP_FUNCTION_NAME = "btnScrollToTop_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; padding:10px; border-radius:4px; box-shadow:0 1px 3px rgba(26,26,26,.1); ';
        style += '}';

        style += '#' + BUTTON_ID + ':hover { background-color: #555;  }';

        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;}';

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

    function addButton() {
        var elButton = document.createElement("button");
        elButton.setAttribute('id', BUTTON_ID);
        elButton.setAttribute("onclick", TOP_FUNCTION_NAME);
        elButton.setAttribute('title', "Go To Top");
        elButton.innerHTML = "Top";

        document.body.appendChild(elButton);
    }


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