Answer to Question #306435 in HTML/JavaScript Web Application for swathi

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Answer to Question #306435 in HTML/JavaScript Web Application for swathi

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Programming & Computer Science>

HTML/JavaScript Web Application

Question #306435

Hourly Stop Watch

The goal of this coding exam is to quickly get you off the ground with the clearInterval and setInterval.

Refer to the below image.

https://assets.ccbp.in/frontend/content/react-js/hourly-stop-watch-op.gif

Achieve the given functionality using JS.

The timer should be initiated at 0.

When the HTML button element with the id
startBtn is clicked, the timer should be started.
When the HTML button element with the id
stopBtn is clicked, the timer should be stopped.
When the HTML button element with the id
And do not include onclick events in the html button elements.
we need to access those dynamically
startBtn is clicked after the HTML button element with id stopBtn clicked, the timer should be resumed.
Timer should reset to 00 minutes, 00 seconds after one hour.

Note

This is a one hour timer. The maximum time is one hour.

Expert's answer

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');
        * {
            font-family: 'Roboto', sans-serif;
        }
        .wrapper {
            width: 250px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .timer {
            font-size: 50px;
            margin-bottom: 10px;
        }
        button {
            height: 40px;
            width: 100px;
            border-radius: 5px;
            border: none;
            outline: none;
            cursor: pointer;
            color: white;
            font-size: 20px;
        }
        #startBtn { background: #15ac29; }
        #startBtn:hover { background: #128821; }
        #stopBtn { background: #b31515; }
        #stopBtn:hover { background: #8a1010; }
    </style>
    <div class="wrapper">
        <div class="timer">
            <span id="minutes">00</span>:<span id="seconds">00</span>
        </div>
        <div class="btns">
            <button id="startBtn">Start</button>
            <button id="stopBtn">Stop</button>
        </div>
    </div>
    <script>
        const startBtn = document.querySelector('#startBtn'),
              stopBtn = document.querySelector('#stopBtn'),
              minutesHtml = document.querySelector('#minutes'),
              secondsHtml = document.querySelector('#seconds')

        let minutes = 0,
            seconds = 0,
            timer;

        function changeTime() {
            if (++seconds === 60) {
                seconds = 0
                if (++minutes === 60) {
                    minutes = 0;
                    seconds = 0
                }
            }
            minutesHtml.textContent = minutes < 10 ? `0${minutes}` : minutes
            secondsHtml.textContent = seconds < 10 ? `0${seconds}` : seconds
        }

        startBtn.addEventListener('click', () => {
            timer = setInterval(changeTime, 1000)
        })

        stopBtn.addEventListener('click', () => {
            clearInterval(timer)
        })

    </script>
</body>
</html>

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Answer to Question #306435 in HTML/JavaScript Web Application for swathi

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