darekagakaku endless scroll and pushstate

by taizooo 2015-02-26 [2015/02/26 19:18:54]
(Forked from darekagakaku endless scroll by taizooo)

darekagakaku nikki wo random ni autopagerize with scroll push^H^H^H^HreplaceState

• /*
   * @title darekagakaku endless scroll and pushstate
   * @description darekagakaku nikki wo random ni autopagerize with scroll push^H^H^H^HreplaceState
   * @include http://darekagakaku.herokuapp.com/*
   * @license MIT License
   */
  
  // http://darekagakaku.herokuapp.com/ wo endless summer-ize!!!
  // via http://wayback.archive.org/web/20131110230206/http://userscripts.org/scripts/review/47998
  
  var next = location.href;
  var depth = 0;
  var hold = [];
  hold.push({
    "url": next,
    "depth": depth
  })
  
  var State = true;
  var HTML_NAMESPACE = 'http://www.w3.org/1999/xhtml';
  var BASE_REMAIN_HEIGHT = 50;
  var loading = false;
  
  var now = new Date();
  var bottom = new Date("Feburary 17, 2012"); /* http://darekagakaku.herokuapp.com/v/2012-02-17 */
  
  var last_element = get_next_elements(document).pop();
  if (!last_element) {
    return error();
  }
  var insert_point = last_element.nextSibling;
  var insert_parent = last_element.parentNode;
  
  next_page_load();
  
  window.addEventListener('scroll', function () {
    if (loading) return;
    var remain = document.documentElement.scrollHeight - window.innerHeight - window.pageYOffset;
    if (State && remain < BASE_REMAIN_HEIGHT) {
      next_page_load();
    }
  }, false);
  
  function next_page_load() {
    loading = true;
    next = go();
    var x = new XMLHttpRequest();
    x.onload = function () {
      if (x.status <= 200 && x.status < 300) {
        load(x);
      } else {
        error();
      }
    };
    x.open('GET', next, true);
    x.send(null);
  }
  
  function load(x) {
    var html = x.responseText.replace(/<script(?:[ \t\r\n][^>]*)?>[\S\s]*?<\/script[ \t\r\n]*>|<\/?(?:i?frame|html|script|object)(?:[ \t\r\n][^<>]*)?>/gi, ' ');
    var htmlDoc;
    if (document.implementation.createHTMLDocument) {
      htmlDoc = document.implementation.createHTMLDocument('hogehoge')
    } else {
      htmlDoc = document.cloneNode(false);
      if (htmlDoc) {
        htmlDoc.appendChild(htmlDoc.importNode(document.documentElement, false));
      } else {
        htmlDoc = document.implementation.createDocument(null, 'html', null);
      }
    }
    var range = document.createRange();
    range.selectNodeContents(document.documentElement);
    htmlDoc.documentElement.appendChild(range.createContextualFragment(html));
    //next = get_next(htmlDoc);
    var docs = get_next_elements(htmlDoc);
    if (!docs.length) {
      return error();
    }
  
    var lastElement = get_next_elements(document).pop();
    depth = getElementPosition(lastElement).bottom;
    hold.push({
      "url": next,
      "depth": depth
    })
  
    docs = docs.map(function (doc) {
      return insert_parent.insertBefore(document.importNode(doc, true), insert_point);
    });
  
    //history.pushState("", "", next);
  
    loading = false;
    //  if (!next) {
    //    return terminate();
    //  }
  }
  
  var timer = null;
  window.addEventListener('scroll', function () {
    clearTimeout(timer);
    timer = setTimeout(function () {
      onscroll();
    }, 10);
  }, false);
  
  function onscroll() {
    current = window.pageYOffset;
    for(var i = hold.length - 1, section; (ele = hold[i]); i--) {
      if(ele.depth <= current) break;
    }
    ele = hold[i];
    if (ele.url != location.href) {
      //history.pushState("", "", ele.url);
      history.replaceState("", "", ele.url);
      console.log('current: '+current);
      console.log('url: '+ele.url);
      console.log('depth: '+ele.depth);
    }
  }
  
  //function get_next(doc) {
  //  return doc.evaluate('id("next_page_link")', doc, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
  //}
  function get_next_elements(doc) {
    var r = doc.evaluate('//div[@class="content"]', doc, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, l = r.snapshotLength, res = new Array(l); i < l; i++) res[i] = r.snapshotItem(i);
    return res;
  }
  
  function error() {
    return console.log('error');
    State = false;
  }
  
  function terminate() {
    return console.log('terminate');
    State = false;
  }
  
  // via http://d.hatena.ne.jp/javascripter/20080531/1212264942
  function getElementPosition(elem) {
    var position = elem.getBoundingClientRect();
    return {
      left: Math.round(window.scrollX + position.left),
      right: Math.round(window.scrollY + position.right),
      top: Math.round(window.scrollY + position.top),
      bottom: Math.round(window.scrollY + position.bottom)
    }
  }
  
  // via http://let.hatelabo.jp/taizooo/let/gYC-xcG60rLuBA
  function trim(num, l) {
    if (num < 0) {
      num = -(num);
    }
    if (typeof (num) != 'string') {
      num = '' + num;
    }
    var s = l - num.length;
    while (s > 0) {
      num = '0' + num;
      --s;
    }
    return num;
  }
  
  function rday(max, min) {
    max = max.getTime();
    min = min.getTime();
    rd = new Date(Math.floor(Math.random() * (max - min) + min));
    d = trim(rd.getFullYear(), 4) + "-" + trim(rd.getMonth() + 1, 2) + "-" + trim(rd.getDate(), 2);
    return d;
  }
  
  function go() {
    url = "http://darekagakaku.herokuapp.com/v/" + rday(now, bottom);
    if (next == url) {
      url = "http://darekagakaku.herokuapp.com/a";
    }
    return url;
  }

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