Back to Top

Scroll Back To Top Button

Fra og med 16.03.2018. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greatest.deepsurf.us/scripts/39499/259015/Back%20to%20Top.js

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Wrap lines

// ==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);
    }
})();