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Study.com Quiz Answers

Highlights correct answers with a green background on Study.com quizes and exams

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  1. // ==UserScript==
  2. // @name        Study.com Quiz Answers
  3. // @namespace   https://greasyfork.org/en/users/668659-denvercoder1
  4. // @match       *://*.study.com/*
  5. // @include     https://study.com/*
  6. // @grant       none
  7. // @version     1.4.0
  8. // @author      Jonah Lawrence
  9. // @description Highlights correct answers with a green background on Study.com quizes and exams
  10. // @license     MIT
  11. // ==/UserScript==
  12.  
  13. /* jshint esversion: 6 */
  14.  
  15. (function () {
  16.     // add styling for highlighting correct answers
  17.     // quiz answers will at this point already be highlighted since they have this attribute
  18.     const styles = '[data-correct="true"] { background: #c5ff81; box-shadow: 0 0 0 14px #c5ff81; border-radius: 2px; }';
  19.     document.getElementsByTagName("head")[0].insertAdjacentHTML("beforeend", `<style>${styles}</style>`);
  20.     // get exam container
  21.     const container = document.querySelector("#practice-exam-container");
  22.     // check if the element exists (only on exam pages)
  23.     if (!container) {
  24.         // exit function since this is not an exam
  25.         return;
  26.     }
  27.     const interval = setInterval(function () {
  28.         // if this is an exam, get the Controller
  29.         const controller = angular.element(container).controller();
  30.         // wait for the controller to be loaded
  31.         if (controller) {
  32.             // get the questions list
  33.             const questions = controller.questionByQuestionInstanceId;
  34.             // highlight the correct answer to each question
  35.             Object.values(questions).forEach(function (x) {
  36.                 const correctAnswer =
  37.                     document.querySelector(`li[ng-class*="${x.correctQuizQuestionOptionId}"]`) ||
  38.                     document.querySelector(`input[id$="${x.correctQuizQuestionOptionId}"]`).closest("li");
  39.                 // check that element for the correct answer exists on the page
  40.                 if (correctAnswer) {
  41.                     // mark answer as correct so it can be highlighted
  42.                     correctAnswer.dataset.correct = true;
  43.                     // no need to keep checking
  44.                     clearInterval(interval);
  45.                 }
  46.             });
  47.         }
  48.     }, 500);
  49. })();