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Go to Top

Scroll Back To Top Button

Fra og med 15.03.2018. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @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);
    }
})();