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Hide TopCoder problem archive categories

Hides the category list in the topcoder problem archive, because knowing the categories of a problem can spoil the solution! (The categories are replaced with '...', click on them to toggle hidden-ness.)

  1. // ==UserScript==
  2. // @name        Hide TopCoder problem archive categories
  3. // @namespace   kunaifirestuff
  4. // @description Hides the category list in the topcoder problem archive, because knowing the categories of a problem can spoil the solution! (The categories are replaced with '...', click on them to toggle hidden-ness.)
  5. // @include     http://community.topcoder.com/tc?module=ProblemArchive*
  6. // @version     1
  7. // @grant       none
  8. // ==/UserScript==
  9.  
  10. var table = document.getElementsByTagName('b') [0].parentElement.parentElement.parentElement.parentElement;
  11. var categoryArray = new Array(table.childElementCount - 9);
  12. var hiddenText = '...';
  13.  
  14. for (var i = 3; i < table.childElementCount - 6; i++) {
  15.   (function (i) {
  16.     var cats = table.children[i].children[5];
  17.     
  18.     categoryArray[i - 3] = cats.textContent;
  19.     cats.textContent = hiddenText;
  20.     cats.setAttribute('align', 'center');
  21.     
  22.     cats.addEventListener('click', function () {
  23.       if (cats.textContent == hiddenText) {
  24.         cats.textContent = categoryArray[i - 3];
  25.       } else {
  26.         cats.textContent = hiddenText;
  27.       }
  28.     });
  29.   }(i));
  30. }