Given a DateTime object, I am tasked with displaying a timer on my component.
The timer signifies an expiration, so once it reaches 0, the component needs to be updated accordingly.
Currently, I am unsure of how best to achieve this as I have not come across any existing modules that can help with this functionality.
To implement a recurring function, consider using the setInterval method in the following manner:
setInterval(() => { this.isActive = true; this.fetchData(); }, 60000);The value 60000 represents one minute in milliseconds.
Wishing you success with your implementation!
If you're looking to create a countdown in your application, you can utilize the timer function from rxJS. This function takes a parameter of milliseconds and allows you to set up a countdown based on that duration. To initiate the countdown, you will first need to calculate the remaining time by subtracting the expiration date from the current time. Once you have the remaining time calculated, you can subscribe to the timer to trigger the code responsible for updating your component.
import { timer } from 'rxjs';
const remainingTime = expiration.getTime() - Date.now();
timer(remainingTime).subscribe(() => this.updateComponent); const countId: any = null;
let startingTime = 0;
let passedTime = 0;
// Dynamic signals
secondsPassed = signal(0); // Time in milliseconds
// Begin the timer
startTimer(): void {
if (countId) return; // Avoid multiple intervals
startingTime = Date.now() - passedTime;
countId = setInterval(() => {
this.deltaTime.set(Date.now() - startingTime);
}, 10); // Refresh every 10ms for precise measurement
}
// Cease the timer
stopTimer(): void {
if (countId) {
clearInterval(countId);
countId = null;
passedTime = this.secondsPassed();
}
}
// Restart the timer
resetTimer(): void {
this.stopTimer(); // Stop the timer
passedTime = 0;
this.deltaTime.set(0); // Set time back to zero
}
// Translate milliseconds into human-readable format (HH:MM:SS:MS)
displayTime(ms: number): string {
const hours = Math.floor(ms / 3600000);
const minutes = Math.floor((ms % 3600000) / 60000);
const seconds = Math.floor((ms % 60000) / 1000);
const milliseconds = Math.floor((ms % 1000) / 10);
return (
(hours ? hours + ':' : '') +
(minutes < 10 ? '0' : '') + minutes + ':' +
(seconds < 10 ? '0' : '') + seconds + ':' +
(milliseconds < 10 ? '0' : '') + milliseconds
);
}
<!-- timer.component.html -->
<div class="timer">
<h2>Timer</h2>
<div class="current-time">{{ displayTime(secondsPassed()) }}</div> <!-- Show formatted
time -->
<div class="options">
<button (click)="startTimer()">Start</button>
<button (click)="stopTimer()">Stop</button>
<button (click)="resetTimer()">Reset</button>
</div>
</div>
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