javbus.waterfall

Infinite scroll @ javbus.com
当前为 2017-02-13 提交的版本，查看最新版本。
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// ==UserScript==
// @name        javbus.waterfall
// @description Infinite scroll @ javbus.com
// @namespace   https://github.com/FlandreDaisuki
// @include     https://www.javbus.com/*
// @include     https://www.javbus2.com/*
// @include     https://www.javbus3.com/*
// @include     https://www.javbus5.com/*
// @include     https://www.javbus.me/*
// @version     2017.02.14
// @grant       none
// ==/UserScript==
const $ = jQuery;

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

class Waterfall {
  constructor(selectorcfg = {}) {
    this.lock = new Lock();
    this.baseURI = this.getBaseURI();
    this.selector = {
      next: 'a.next',
      item: '',
      cont: '', //container
      pagi: '.pagination',
    };
    Object.assign(this.selector, selectorcfg);
    this.pagegen = this.fetchSync(location.href);
    this.anchor = $(this.selector.pagi)[0];

    if ($(this.selector.item).length) {
      document.addEventListener('scroll', this.scroll.bind(this));
      document.addEventListener('wheel', this.wheel.bind(this));
      this.appendElems('first', (cont, elems) => {
        cont.append(elems.slice(1));
      });
    }
  }

  getBaseURI() {
    let _ = location;
    return `${_.protocol}//${_.hostname}${(_.port && `:${_.port}`)}/`;
  }

  getNextURL(href) {
    let a = document.createElement('a');
    a.href = href;
    return `${this.baseURI}${a.pathname}${a.search}`;
  }

  fetchURL(url) {
    console.log(`fetchUrl = ${url}`);
    const fetchwithcookie = fetch(url, { credentials: 'same-origin' });
    return fetchwithcookie
      .then(response => response.text())
      .then(html => new DOMParser().parseFromString(html, 'text/html'))
      .then(doc => {
        let $doc = $(doc);
        let href = $doc.find(this.selector.next).attr('href');
        let nextURL = href ? this.getNextURL(href) : undefined;
        let elems = $doc.find(this.selector.item);

        return {
          nextURL,
          elems
        };
      });
  }

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

  appendElems(first, firstcb) {
    let nextpage = this.pagegen.next();
    if (!nextpage.done) {
        nextpage.value.then(elems => {
          if(first) {
            $(this.selector.cont).empty();
            firstcb($(this.selector.cont), elems)
          } else {
            $(this.selector.cont).append(elems);
          }
        });
    }
    return nextpage.done;
  }

  end() {
    console.info('The End');
    document.removeEventListener('scroll', this.scroll.bind(this));
    document.removeEventListener('wheel', this.wheel.bind(this));
    $(this.anchor).replaceWith($(`<h1>The End</h1>`));
  } 

  static reachBottom(elem, limit) {
    return (elem.getBoundingClientRect().top - $(window).height()) < limit;
  }
  
  scroll() {
    if (Waterfall.reachBottom(this.anchor, 500) && this.appendElems()) {
      this.end();
    }
  }

  wheel() {
    if (Waterfall.reachBottom(this.anchor, 1000) && this.appendElems()) {
      this.end();
    }
  }
}

new Waterfall({
  next: 'a#next',
  item: '.item',
  cont: '#waterfall'
});

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

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;
  }`);