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Zhihu Easy Collapse

快捷地收起知乎首页的长答案

当前为 2015-10-23 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Zhihu Easy Collapse
  3. // @description  快捷地收起知乎首页的长答案
  4. // @author       wenLiangcan
  5. // @version      0.3
  6. // @namespace    https://github.com/wenLiangcan
  7. // @homepage     https://github.com/wenLiangcan/Userscripts
  8. // @license      GPL version 3
  9. // @copyright    Copyright © 2015 wenLiangcan
  10. // @updateURL
  11. // @downloadURL
  12. // @match        http://www.zhihu.com/*
  13. // @grant        none
  14. // @run-at       document-end
  15. // ==/UserScript==
  16.  
  17. (function() {
  18.     function getLastItem(arr) {
  19.         return arr[arr.length - 1];
  20.     }
  21.  
  22.     function toArray(obj) {
  23.         return Array.prototype.slice.call(obj);
  24.     }
  25.  
  26.     function addFloatingCollapseButtons(feeds) {
  27.         feeds.forEach(function(feed) {
  28.             var collapseButton = getLastItem(feed.getElementsByClassName('collapse'));
  29.             if (collapseButton !== undefined) {
  30.                 var newButton = collapseButton.cloneNode(true);
  31.                 newButton.onclick = function() {
  32.                     feed.scrollIntoView(true);
  33.                     collapseButton.click();
  34.                 };
  35.                 newButton.style.position = 'relative';
  36.                 newButton.style.marginTop = '1px';
  37.                 newButton.style.marginLeft = '0px';
  38.                 try {
  39.                     var votebar = getLastItem(feed.getElementsByClassName('zm-votebar'));
  40.                     votebar.appendChild(newButton);
  41.                 } catch (e) {
  42.                     console.log(e);
  43.                 }
  44.             }
  45.         });
  46.     }
  47.  
  48.     function getSelectorsBasedOnUrl() {
  49.         var selectors = [];
  50.  
  51.         // explore
  52.         if (/^http:\/\/www\.zhihu\.com\/explore(\/(#.*?)?)?$/.test(document.URL)) {
  53.             selectors = [
  54.                 '#js-explore-tab > div:nth-child(4) > div',
  55.                 '#js-explore-tab > div:nth-child(5) > div'
  56.             ];
  57.         }
  58.         // main
  59.         else if (/^http:\/\/www\.zhihu\.com(\/(#.*?)?)?$/.test(document.URL)) {
  60.             selectors = ['#js-home-feed-list'];
  61.         }
  62.  
  63.         return selectors;
  64.     }
  65.  
  66.     function observeFeedList(feedList) {
  67.         var observer = new MutationObserver(function(mutations) {
  68.             mutations.forEach(function(mutation) {
  69.                 addFloatingCollapseButtons(toArray(mutation.addedNodes));
  70.             });
  71.         });
  72.         var observerConfig = {
  73.             childList: true
  74.         };
  75.         observer.observe(feedList, observerConfig);
  76.     }
  77.  
  78.     getSelectorsBasedOnUrl().forEach(function(selector) {
  79.         var feedList = document.querySelector(selector);
  80.         observeFeedList(feedList);
  81.     });
  82.  
  83.     addFloatingCollapseButtons(
  84.         toArray(document.getElementsByClassName('feed-item')));
  85. })();