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dragoncat / 豆瓣小组话题快速预览-douban group topic fast preview

// ==UserScript==
// @name         豆瓣小组话题快速预览-douban group topic fast preview
// @namespace    https://github.com/DragonCat1
// @version      0.4
// @license      MIT
// @description  可以在豆瓣小组列表页面快速预览帖子内容，无须再打开新窗口
// @author       铛铛铛铛铛/https://www.douban.com/people/48915223
// @copyright    1991-2018,铛铛铛铛铛-Dragoncat
// @match        https://www.douban.com/group/*
// @exclude      https://www.douban.com/group/*/new_topic
// @exclude      https://www.douban.com/group/people/*/
// @exclude      https://www.douban.com/group/people/*/joins
// @exclude      https://www.douban.com/group/explore*
// @exclude      https://www.douban.com/group/search*
// @grant        none
// ==/UserScript==

(function () {
  'use strict';
  const isTopicPage = location.pathname.match(/\/group\/topic/)
  const style = document.createElement("style")
  style.type = "text/css"
  if (!isTopicPage) {
    style.innerHTML = `
::-webkit-scrollbar {
width: 10px;
height: 10px;
}
::-webkit-scrollbar-thumb {
background: #656565;
box-shadow: inset 0 0 5px rgba(0,0,0,.1);
}
::-webkit-scrollbar-thumb:hover {
background: #323232;
}
::-webkit-scrollbar-track {
background: #ededed;
box-shadow: inset 0 0 5px rgba(0,0,0,.1);
}
#wrapper{
margin:0;
width: 100%;
box-sizing: border-box;
}
#group-info .group-desc {
    width: auto;
}
table.olt tr:not(.th):hover,table.olt tr:not(.th).active{
cursor: pointer;
background: #f2f8f2;
}
.grid-16-8 .article{
padding-right: 10px;

}
#iframe-wrapper{
width: -webkit-fill-available;
height: -webkit-fill-available;
margin:0 305px 0 686px;
top:0;
}
#priview{
width: -webkit-fill-available;
height: -webkit-fill-available;
background: #fefefe;
border: none;
box-shadow: 0 0 2px #00000038;
}
`
    document.head.appendChild(style)
    const grid = document.querySelector('.grid-16-8')
    const article = document.querySelector('.article')
    const iframe = document.createElement("iframe")
    const iframeWrapper = document.createElement("div")
    const trs = document.querySelectorAll('table.olt tr:not(.th)')
    let timer
    let prevTr
    iframeWrapper.id = "iframe-wrapper"
    iframe.srcdoc = '<style>p{color:#bbb;font-style:italic;font-size:12px;}a{color: #0f959d;text-decoration: none;}a:hover{color:red;}</style><p>/*话题快速预览 © <a href="https://www.douban.com/people/48915223/">铛铛铛铛铛</a>*/</p><p>Tips:<br/>因为豆瓣的原因，在预览里发表回应不会刷新页面，但实际是发表成功的</p>'
    iframe.id = "priview"
    iframeWrapper.appendChild(iframe)
    grid.insertBefore(iframeWrapper, document.querySelector('.extra'))
    trs.forEach(tr => {
      //tr.onmouseenter = function () {
      //   changeClass(tr)
      //    if(timer) clearTimeout(timer)
      //    timer = setTimeout(()=>{
      //       loadContent(tr)
      //     },100)
      // }
      tr.onclick = function () {
        changeClass(tr)
        loadContent(tr)
      }
    })
    article.tabIndex = 1
    article.addEventListener("keydown", e => {
      if ([38, 40].includes(e.keyCode)) {
        e.preventDefault()
        const curTr = document.querySelector('table.olt tr:not(.th).active') || document.querySelector('table.olt tr:not(.th)')
        let nextTr
        if (e.keyCode === 38) {
          nextTr = curTr.previousElementSibling || curTr
        }
        else if (e.keyCode === 40) {
          nextTr = curTr.nextElementSibling || curTr

        }
        changeClass(nextTr)
        loadContent(nextTr)
      }

    })
    window.addEventListener("scroll", function () {
      changepos()
    })
    changepos()

    function changeClass(tr) {
      if (prevTr) prevTr.classList.remove('active')
      prevTr = tr
      tr.classList.add('active')
    }

    function loadContent(tr) {
      iframe.removeAttribute('srcdoc')
      iframe.src = tr.querySelector('a').href
    }

    function changepos() {
      if (document.documentElement.scrollTop > document.querySelector(".article").offsetTop) {
        iframeWrapper.style.position = "fixed"
      }
      else {
        iframeWrapper.style.position = "relative"
      }
    }
  }
  else {
    style.innerHTML = `
::-webkit-scrollbar {
width: 10px;
height: 10px;
}
::-webkit-scrollbar-thumb {
background: #656565;
box-shadow: inset 0 0 5px rgba(0,0,0,.1);
}
::-webkit-scrollbar-thumb:hover {
background: #323232;
}
::-webkit-scrollbar-track {
background: #ededed;
box-shadow: inset 0 0 5px rgba(0,0,0,.1);
}
`
    document.head.appendChild(style)
  }
})();