Narou Index scroller

小説家になろうの目次で前後の章に移動するアイコンとナビをつける

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Narou Index scroller
// @namespace    http://ncode.syosetu.com/
// @version      0.7.3
// @description  小説家になろうの目次で前後の章に移動するアイコンとナビをつける
// @author       b2ox
// @match        *://ncode.syosetu.com/*
// @grant        none
// ==/UserScript==

{
    const chapters = $('div.index_box > div.chapter_title')
    const lst = $('<ul>')
    const n = chapters.length
    chapters.each((i,elm) => {
        const nav = $('<span>')
        const _up = $('<span>').text('⇧').attr('title','前章へ移動').css('cursor','pointer').click(() => {$('#ct'+(i-1))[0].scrollIntoView();window.scrollBy(0,-20);})
        const _down = $('<span>').text('⇩').attr('title','次章へ移動').css('cursor','pointer').click(() => {$('#ct'+(i+1))[0].scrollIntoView();window.scrollBy(0,-20);})
        lst.append($('<li>').text($(elm).text()).css('margin','1ex').css('cursor','pointer').click(() => {$('#ct'+i)[0].scrollIntoView();window.scrollBy(0,-20);}))
        if (i>0) nav.append(_up)
        if (i<n-1) nav.append(_down)
        $(elm).attr('id','ct'+i).prepend(nav)
    })
    if (n > 0) {
        const nhead = $('#novel_header');
        const style = window.getComputedStyle(nhead[0]);
        const lsize = parseFloat(style.lineHeight == 'normal' ? style.fontSize : style.lineHeight);
        const h = Math.min(lsize * (n + 3), $(window).height() * 0.6);
        const chNavi = $('<div id="chapter_navi"/>').css('margin','1em').css('border','solid 2px black').css('width','max-content').css('height',`${h}px`).css('overflow','scroll');
        chNavi.append(lst)
        nhead.append(chNavi)
    }
}