ニコニコ動画でプレーヤー下部のプレイリストに各動画のマイリス率を表示する userscript。Chrome で動く版。

mlratio.user.js

// ==UserScript==
// @license     magnet:?xt=urn:btih:5305d91886084f776adcf57509a648432709a7c7&dn=x11.txt
// @name        mlratio
// @description put Mylist ratio (= # of lists the video saved / # of video views) in playlist
// @namespace   http://twitter.com/criticabug
// @include     http://www.nicovideo.jp/watch/*
// @grant       none
// @run-at      document-end
// @version     1.10
// ==/UserScript==

(function (w) {
    'use strict';
    var extractNumber = function (elem) {
        return parseInt(elem.innerText.replace(',',''), 10);
    };
    var container = w.document.querySelector('#playlistContainerInner');
    var elems = container.querySelectorAll('li.playlistItem .videoInformation');
    var len = elems.length;
    if (len == 0) {
        console.warn('videoInformation not found');
    }
    var i;
    for (i = 0; i < len; i++) {
        (function (vInformation) {
            // closure
            var mylist = vInformation.querySelector('li.videoMylist span');
            mylist.addEventListener('DOMSubtreeModified', function (event) {
                var view = vInformation.querySelector('li.videoView span');
                if (isNaN(extractNumber(view)) || isNaN(extractNumber(mylist)) || vInformation.querySelector('li.videoMlratio')) {
                    return;
                }
                var li = w.document.createElement('li');
                li.className = 'videoMlratio'
                li.innerHTML = 'マイ率:<span>' + Math.round(1000.0 * extractNumber(mylist) / extractNumber(view)) / 10.0 + '</span>%';
                vInformation.appendChild(li);
            });
        })(elems[i]);
    }
})(typeof unsafeWindow === 'undefined' ? window : unsafeWindow);
// @license-end