stopWatch/index.html at master · dionydion/stopWatch · GitHub

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<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8" />
    <title>Simple setInterval clock</title>
    <style>
      p {
        font-family: sans-serif;
      }
    </style>
  </head>
  <body>
    <p class="clock"></p>
    <input class="start-btn" type="button" value="start" />
    <input class="stop-btn" type="button" value="stop" />
    <input class="reset-btn" type="button" value="reset" />
    <script>
      //   var displayTime = function(){
      //       let date = new Date();
      //       let time = date.toLocaleTimeString();
      //       document.querySelector('.clock').textContent = time
      //   }
      //   displayTime();
      //   const createClock = setInterval(displayTime, 1000);


      //store references of buttons into variables
      startBtn = document.querySelector(".start-btn");
      stopBtn = document.querySelector(".stop-btn");
      resetBtn = document.querySelector(".reset-btn");

      // create a function that outputs the time difference between time when start button is pressed and current time
      let startTime = Date.now();
      var start = function () {
        let dateNow = Date.now();
        let timeElapsedInSeconds = (dateNow - startTime) / 1000;
        let hours = Math.floor(timeElapsedInSeconds / 3600);
        let minutes = Math.floor((timeElapsedInSeconds % 3600) / 60);
        let seconds = Math.floor((timeElapsedInSeconds % 3600) % 60);

        if (hours < 10) {
          hours = `0` + hours;
        }

        if (minutes < 10) {
          minutes = `0` + minutes;
        }

        if (seconds < 10) {
          seconds = `0` + seconds;
        }
        document.querySelector(
          ".clock"
        ).textContent = `${hours}:${minutes}:${seconds}`;
      };

      // declare stopWatch variable to store interval when it is active
      let stopWatch
      // when start button is pressed, start running start() once per sound using setInterval()
      startBtn.addEventListener("click", ()=>{
            startTime = Date.now()
            stopWatch= setInterval(start,1000)
            startBtn.disabled = true
      });
      // when stop button is pressed, stop the intervals from continueing.
      stopBtn.addEventListener("click",()=>{
          clearInterval(stopWatch);
          stopBtn.disabled = true
      })
      // when reset button is pressed, the time restarts back to zero
      resetBtn.addEventListener("click",()=>{
          clearInterval(stopWatch)
          startBtn.disabled = false;
          stopBtn.disabled = false;
          startTime=Date.now()
          start()
      })
      //display the time immediately when the page is loaded
      start()
    </script>
  </body>
</html>