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Hackernews Scroll to Next/Previous Top-Level Comment

Adds a button and keyboard shortcuts (down and up arrows) that scroll to quickly and smoothly navigate to the next/previous top-level comment. This scroller saves time by allowing you to skip comment threads you're not interested in. An alternative to collapsing the thread.

Fra og med 12.01.2023. Se den nyeste version.

// ==UserScript==
// @name         Hackernews Scroll to Next/Previous Top-Level Comment
// @namespace    https://news.ycombinator.com/
// @version      0.2
// @description  Adds a button and keyboard shortcuts (down and up arrows) that scroll to quickly and smoothly navigate to the next/previous top-level comment. This scroller saves time by allowing you to skip comment threads you're not interested in. An alternative to collapsing the thread.
// @author       Jonathan Woolf
// @match        https://news.ycombinator.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const button = document.createElement('button');
    button.textContent = '⬇️';
    button.style.cssText = `
        position: fixed;
        bottom: 10px;
        left: 10px;
        z-index: 999;
        background-color: rgb(255, 198, 156);
        color: #fff;
        border: 6px solid rgb(255, 102, 0);
        background-color: rgb(255, 198, 156);
        border-radius: 50%;
        width: 40px;
        height: 40px;
        font-size: 24px;
        text-align: center;
        line-height: 40px;
        cursor: pointer;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 91%;
    `;
    document.body.appendChild(button);

    const comments = [...document.querySelectorAll('td.ind[indent="0"]')];
    let currentCommentIndex = 0;

    button.addEventListener('click', scrollToNextComment);
    document.addEventListener("keydown", handleKeyPress);

    function handleKeyPress(event) {
        if (event.code === "ArrowDown") {
            event.preventDefault();
            scrollToNextComment();
        } else if (event.code === "ArrowUp") {
            event.preventDefault();
            scrollToPreviousComment();
        }
    }

    function scrollToNextComment() {
        if (currentCommentIndex === comments.length - 1) {
            currentCommentIndex = 0;
        } else {
            currentCommentIndex++;
        }
        comments[currentCommentIndex].closest('tr').scrollIntoView({ behavior: 'smooth', block: 'start' });
    }

    function scrollToPreviousComment() {
        if (currentCommentIndex === 0) {
            currentCommentIndex = comments.length - 1;
        } else {
            currentCommentIndex--;
        }
        comments[currentCommentIndex].closest('tr').scrollIntoView({ behavior: 'smooth', block: 'start' });
    }
})();