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Leetcode Timer

Start a timer whenever a user loads a problem at Leetcode.com

As of 2020-05-18. See the latest version.

  1. // ==UserScript==
  2. // @name     Leetcode Timer
  3. // @description:en Start a timer whenever a user loads a problem at Leetcode.com
  4. // @version  1.1
  5. // @grant    none
  6. // @include	 *://*leetcode.com/problems/*
  7. // @author   ketankr9
  8. // @namespace https://greatest.deepsurf.us/users/564674
  9. // @description Start a timer whenever a user loads a problem at Leetcode.com
  10. // ==/UserScript==
  11.  
  12.  
  13. function countdownTimer() {
  14.   var difference = +new Date() - startTime;
  15.   var elapsed = "0";
  16.  
  17.   var parts = {
  18.     days: Math.floor(difference / (1000 * 60 * 60 * 24)),
  19.     hours: Math.floor((difference / (1000 * 60 * 60)) % 24),
  20.     minutes: Math.floor((difference / 1000 / 60) % 60),
  21.     seconds: Math.floor((difference / 1000) % 60)
  22.   };
  23.  
  24.   elapsed = Object.keys(parts)
  25.     .map(part => {
  26.     if (!parts[part]) return;
  27.     return `${parts[part]} ${part}`;
  28.   })
  29.     .join(" ");
  30. 	
  31.   document.getElementById("countdown").innerHTML = elapsed;
  32. }
  33.  
  34. var f = function(div){
  35.   var el = document.createElement("div");
  36.   el.className = "tool-item__2DCU";
  37.   el.innerHTML = '<div id="countdown" style="font-size:20px;" ></div>';
  38.   
  39.   div.insertBefore(el, div.firstChild);
  40.   
  41.   startTime = +new Date();
  42.   setInterval(countdownTimer, 1000);
  43. }
  44.  
  45. function waitForElementToDisplay(selector, time, f) {
  46.   			var node = document.getElementsByClassName(selector);
  47.         console.log(node);
  48.         if(node.length > 0) {
  49.           	console.log("Element Found");
  50.             f(node[0])
  51.             return;
  52.         }
  53.         setTimeout(function() {
  54.             waitForElementToDisplay(selector, time, f);
  55.         }, time);
  56.     }
  57.  
  58. var startTime;
  59. waitForElementToDisplay("btns__1OeZ", 1000, f);