Stopwatches
are a crucial tool for timing events, whether it's for sports or productivity
purposes. In this article, we will go over the steps to create a stopwatch
using JavaScript.
Step 1:
Setting up the HTML
First,
we will create a basic HTML structure for our stopwatch. This structure will
include a start button, stop button, and a display to show the elapsed time.
<div id="stopwatch">
<p id="time">00:00:00</p> <button id="start">Start</button>
<button id="stop">Stop</button> </div>
Step 2:
Writing the JavaScript
Next, we
will write the JavaScript code that will control the functionality of the
stopwatch. We will use the setInterval function to increment the time and the
clearInterval function to stop the stopwatch.
let
timer; let time = 0; const startBtn = document.querySelector('#start'); const
stopBtn = document.querySelector('#stop'); const display = document.querySelector('#time');
startBtn.addEventListener('click', startTimer); stopBtn.addEventListener('click',
stopTimer); function startTimer() { timer = setInterval(function() { time++;
display.textContent = convertTime(time); }, 1000); } function stopTimer() { clearInterval(timer);
} function convertTime(time) { let minutes = Math.floor(time / 60); let seconds
= time % 60; return `${minutes}:${seconds < 10 ? '0' : ''}${seconds}`; }
Step 3:
Testing the Stopwatch
Finally,
we will test our stopwatch to make sure it is working correctly. If everything
has been done correctly, clicking the start button should start the stopwatch
and clicking the stop button should stop it.
With
these simple steps, you should now be able to create your own stopwatch using
JavaScript. By understanding these basics, you can expand upon this code and
create more complex stopwatches with additional features.
