JavaScript-Projects/timer.html at main · srujana-manda/JavaScript-Projects · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=, initial-scale=1.0">
    <title>Timer</title>
    <style>
        body{
            font-family: poppins,sans-serif;
        }
        h1{
          text-align: center;
        }
        .box{
            margin: 10rem auto;
            padding: 20px;
            text-align: center;
            border: 3px solid black;
            padding: 20px;
            width:600px;
            border-radius: 10px;
        }
        #timer{
            font-size: 52px;
            margin: 2rem;
            font-weight: 700;
            color: #dd2241;
            text-shadow: 2px 2px #be3b51;
        }
        .buttons{
          display: flex;
          align-items: center;
          justify-content: center;
          margin: 1rem;
        }
        button{
            background-color: #dd2241;
          padding: 30px 51px;
          margin: 1rem;
          border: 1px solid #dd2241;
          border-radius: 10px;
          font-size: 25px;
          color: white;
        }
        button[disabled]{
            opacity: 0.5;
            cursor: default;
        }
    </style>
</head>
<body>

    <div class="box">
      <h1>TIMER</h1>
      <div class="timer">
          <p id="timer">00:00:00</p>
      </div>
      <div class="buttons">
          <button id="start">Start</button>
          <button disabled id="stop">Stop</button>
          <button id="reset">Reset</button>
      </div>
     </div>

   <script>
    const buttonE1 = document.getElementsByClassName("buttons");
    const timerE1 = document.getElementById("timer");
    const startE1 = document.getElementById("start");
    const stopE1 = document.getElementById("stop");
    const resetE1 = document.getElementById("reset");

   let startTime = 0;
   let elapsedTime = 0;
   let timerInterval;


    function startTimer(){
        // console.log("start");
      startTime = Date.now() - elapsedTime;
    //   console.log(startTime);

      timerInterval = setInterval(()=>{
        elapsedTime = Date.now() - startTime;
       timerE1.innerText= formatTime(elapsedTime);
    //    console.log(elapsedTime);
      },10)
      startE1.disabled = true;
      stopE1.disabled = false;

    }

    function formatTime(elapsedTime){
        const milliseconds = Math.floor((elapsedTime % 1000)/10);
        const seconds = Math.floor((elapsedTime % (1000*60))/1000);
        const minutes = Math.floor((elapsedTime % (1000*60*60))/(1000*60));
        const hours = Math.floor((elapsedTime % (1000*60*60))/(1000*60));


        return (
            (hours ? (hours > 9 ? hours : "0" + hours): "00")+
            ":" +
           (minutes ? ( minutes > 9 ? minutes : "0" + minutes):"00")+
           ":" +
           (seconds ? ( seconds > 9 ? seconds : "0" + seconds):"00")+
           "."+
            (milliseconds > 9 ? milliseconds : "0" + milliseconds)
        );

    }

    function stopTimer(){
        // console.log("stop");
        clearInterval(timerInterval);
        startE1.disabled = false;
      stopE1.disabled = true;

    }

    function resetTimer(){
        // console.log("reset");
        elapsedTime = 0;
        timerE1.innerText="00:00:00"
        startE1.disabled = false;
        stopE1.disabled = true;
    }


  startE1.addEventListener("click",startTimer);
  stopE1.addEventListener("click",stopTimer);
  resetE1.addEventListener("click",resetTimer);


   </script>
</body>
</html>