Periodically records the current playing time while you watch videos, so you don't lose track of where you were watching.
// ==UserScript==
// @name Niconico position saver
// @name:ja ニコニコ動画 再生位置保存
// @version 1.0.0
// @namespace http://www.agj.cl/
// @description Periodically records the current playing time while you watch videos, so you don't lose track of where you were watching.
// @description:ja 定期的に保存されるため、再読み込みしても再生位置がリセットされません。
// @license Unlicense
// @match *://*.nicovideo.jp/watch/*
// @grant none
// ==/UserScript==
// Configuration
const saveIntervalSeconds = 10;
const previewSeconds = 5;
// Utilities
const onLoad = (cb) =>
/interactive|complete/.test(document.readyState)
? setTimeout(cb, 0)
: document.addEventListener("DOMContentLoaded", cb, { once: true });
const getVideo = () => document.querySelector("#MainVideoPlayer video");
const getTimeToSave = (seconds) =>
Math.max(0, Math.floor(seconds - previewSeconds));
onLoad(() => {
// Position saving
let video;
const saveTime = () => {
if (!video || !video.document) {
video = getVideo();
if (!video) return;
video.addEventListener("seeked", saveTime);
}
const seconds = video.currentTime;
const url = new URL(location);
url.searchParams.set("from", getTimeToSave(seconds).toString());
history.replaceState(history.state, document.title, url.toString());
};
setInterval(saveTime, saveIntervalSeconds * 1000);
});