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javbus.waterfall

Infinite scroll @ javbus.com

当前为 2016-12-05 提交的版本，查看 最新版本。

// ==UserScript==
// @name        javbus.waterfall
// @description Infinite scroll @ javbus.com
// @namespace   https://github.com/FlandreDaisuki
// @include     https://www.javbus.com/*
// @version     2016.12.06
// @grant       none
// ==/UserScript==

class Lock {
    constructor(d = false) {
        this.locked = d;
    }
    lock() {
        this.locked = true;
    }
    unlock() {
        this.locked = false;
    }
}

function addStyle(styleStr) {
    $('head').append(`<style>${styleStr}</style>`);
}

function fetchURL(url) {
    console.log(`fetchUrl = ${url}`);

    return fetch(url, {
        credentials: 'same-origin'
    })
        .then((response) => {
            return response.text();
        })
        .then((html) => {
            return new DOMParser().parseFromString(html, 'text/html');
        })
        .then((doc) => {
            let $doc = $(doc);
            let nextURL = `${location.protocol}//${location.host}${$doc.find('a#next').attr('href')}`;
            let elems = $doc.find('div.item');

            return {
                nextURL,
                elems
            };
        });
}

function* fetchSync(urli) {
    let url = urli;
    do {
        yield new Promise((resolve, reject) => {
            if (mutex.locked) {
                reject();
            } else {
                mutex.lock();
                resolve();
            }
        }).then(() => {
            return fetchURL(url).then(info => {
                url = info.nextURL;
                return info.elems;
            });
        }).then(elems => {
            mutex.unlock();
            return elems;
        }).catch((err) => {
            // Locked!
        });
    } while (url);
}

function appendElems(arg) {
    let nextpage = pagegen.next();
    if (!nextpage.done) {
        nextpage.value.then(elems => {
            /* show .avatar-box only in first page */
            $('#waterfall').append((!arg) ? elems.slice(1) : elems);
        });
    }
    return nextpage.done;
}

function xbottom(elem, limit) {
    return (elem.getBoundingClientRect().top - $(window).height()) < limit;
}

function end() {
    console.info('The End');
    $(document).off('scroll');
    $(document).off('wheel');
}

function scroll() {
    if (xbottom(anchor, 500) && appendElems()) {
        end();
    }
}

function wheel() {
    if (xbottom(anchor, 1000) && appendElems()) {
        end();
    }
}

const pagegen = fetchSync(location.href);
const anchor = $('.pagination')[0];
const mutex = new Lock();

if ($('div.item').length) {
    $(document).on('scroll', scroll);
    $(document).on('wheel', wheel);
    $('div.item').remove();
    appendElems('first');

    addStyle(`
    #waterfall {
        height: initial !important;
        width: initial !important;
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
    }
    #waterfall .item.item {
        position: relative !important;
        top: initial !important;
        left: initial !important;
        float: none;
        flex: 25%;
    }
    #waterfall .movie-box,
    #waterfall .avatar-box {
        width: initial !important;
        display: flex;
    }
    #waterfall .movie-box .photo-frame {
        overflow: visible;
    }`);
}