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modified stopwatch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,53 +1,50 @@ | ||
| // Define a counter variable for the number of seconds and set it to zero. | ||
| let secondCount = 0; | ||
| // Define a global to store the interval when it is active. | ||
| let stopWatch; | ||
| // Store a reference to the display paragraph in a variable | ||
| const displayPara = document.querySelector('.clock'); | ||
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| // Function to calculate the current hours, minutes, and seconds, and display the count | ||
| function displayCount() { | ||
| // Calculate current hours, minutes, and seconds | ||
| let hours = Math.floor(secondCount/3600); | ||
| let minutes = Math.floor((secondCount % 3600)/60); | ||
| let seconds = Math.floor(secondCount % 60) | ||
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| // Display a leading zero if the values are less than ten | ||
| let displayHours = (hours < 10) ? '0' + hours : hours; | ||
| let displayMinutes = (minutes < 10) ? '0' + minutes : minutes; | ||
| let displaySeconds = (seconds < 10) ? '0' + seconds : seconds; | ||
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| // Write the current stopwatch display time into the display paragraph | ||
| displayPara.textContent = displayHours + ':' + displayMinutes + ':' + displaySeconds; | ||
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| // Increment the second counter by one | ||
| secondCount++; | ||
| } | ||
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| // Store references to the buttons in constants | ||
| const startBtn = document.querySelector('.start'); | ||
| const stopBtn = document.querySelector('.stop'); | ||
| const resetBtn = document.querySelector('.reset'); | ||
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| // When the start button is pressed, start running displayCount() once per second using setInterval() | ||
| startBtn.addEventListener('click', () => { | ||
| stopWatch = setInterval(displayCount, 1000); | ||
| startBtn.disabled = true; | ||
| }); | ||
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| // When the stop button is pressed, clear the interval to stop the count. | ||
| stopBtn.addEventListener('click', () => { | ||
| clearInterval(stopWatch); | ||
| startBtn.disabled = false; | ||
| }); | ||
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| // When the reset button is pressed, set the counter back to zero, then immediately update the display | ||
| resetBtn.addEventListener('click', () => { | ||
| clearInterval(stopWatch); | ||
| startBtn.disabled = false; | ||
| secondCount = 0; | ||
| displayCount(); | ||
| }); | ||
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| // Run displayCount() once as soon as the page loads so the clock is displayed | ||
| displayCount(); | ||
| //Counter variable for # of SECONDS (set to zero) | ||
| let count = 0; | ||
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| //Global variable defined to store the interval when it is active: | ||
| let stopWatch = 0; | ||
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| //Reference to the display paragraph in a variable | ||
| const displayPara = document.querySelector(".clock"); | ||
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| //Callback function to calculate current hours, minutes, and seconds, and display the count | ||
| function displayCount() { //(abbreviated to hrs, min, sec) | ||
| let hrs = Math.floor(count/3600); //3600 sec in 1 hr. | ||
| let min = Math.floor((count % 3600)/60); //remainder of seconds left over when all hrs are removed, DIVIDED by 60 | ||
| let sec = Math.floor(count % 60); //remainder of seconds left over when all the min are removed | ||
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| //Show a leading zero if the values are less than 10 | ||
| let displayHrs = (hrs < 10) ? '0' + hrs : hrs; | ||
| let displayMin = (min < 10) ? '0' + min : min; | ||
| let displaySec = (sec < 10) ? '0' + sec : sec; | ||
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| //Stopwatch display time written into the display paragraph varable | ||
| displayPara.textContent = displayHrs + ":" + displayMin + ":" + displaySec; | ||
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| count++; //counter variable increments by one every second (constant loop) | ||
| } | ||
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| //References to the button classes | ||
| const startBtn = document.querySelector(".start"); | ||
| const stopBtn = document.querySelector(".stop"); | ||
| const resetBtn = document.querySelector(".reset"); | ||
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| //Once the start btn is pressed, start running displayCount() once per second using setInterval() | ||
| startBtn.addEventListener("click", function() { | ||
| stopWatch = setInterval(displayCount, 1000); | ||
| startBtn.disabled = true; //start btn is UNCLICKABLE (diabled) upon clicking on it as it's already running! | ||
| }); | ||
| //Once the stop btn is pressed, clear the interval | ||
| stopBtn.addEventListener("click", function() { | ||
| clearInterval(stopWatch); | ||
| startBtn.disabled = false; //start btn is CLICKABLE upon clicking the stop btn for the user to start count again! | ||
| }); | ||
| //Once the reset btn is pressed, clear the interval AND the display (00:00:00) | ||
| resetBtn.addEventListener("click", function() { | ||
| clearInterval(stopWatch); | ||
| startBtn.disabled = false; //start btn is CLICKABLE upon clicking the reset btn for the user to start count again! | ||
| count = 0; //set counter back to zero | ||
| displayCount(); | ||
| }); | ||
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| displayCount(); |