Set Timer Using Pipe In Angular

Here, we will develop the angular application for setting the timer using a @pipe. Pipe are used to transform the data, but we can use it in multiple ways.

Step1: Create a new project.

ng new timer-pipe

Step2: Install node_modules

npm install

Step3: Add Component

ng g c set-timer

Step4: In set-timer.component.ts

import { Component, OnInit,OnDestroy  } from '@angular/core';
import { timer, Subscription } from "rxjs";
import { Pipe, PipeTransform } from "@angular/core";

@Component({
  selector: 'app-set-timer',
  templateUrl: './set-timer.component.html',
  styleUrls: ['./set-timer.component.css']
})
export class SetTimerComponent implements OnInit, OnDestroy  {
  countDown: Subscription|any;
  counter:string|any;
  time:string|any;
  tick = 1500;
  ngOnInit() {
  }
  ngOnDestroy() {
    this.countDown = null;
  }

  startTimer(){
    this.counter=this.time;
    this.countDown = timer(0, this.tick).subscribe(() => --this.counter);
    this.time="";
  }
}

Step5: Add pipe

@Pipe({
  name: "formatTime"
})
export class FormatTimePipe implements PipeTransform {
  transform(value: number): string {
    const hours: number = Math.floor(value / 3600);
    const minutes: number = Math.floor((value % 3600) / 60);
    return (
      ("00" + hours).slice(-2) +
      ":" +
      ("00" + minutes).slice(-2) +
      ":" +
      ("00" + Math.floor(value - minutes * 60)).slice(-2)
    );
  }
}

Step6: In set-timer.component.html

<div class="container">
    <div>
        <h3>Write Only Seconds</h3>
        <input type="text" [(ngModel)]="time">
        <button (click)="startTimer()">Start</button>
    </div>
    <div *ngIf="counter"> 
        <label>Timer:</label>
        {{counter|formatTime}}
    </div>
</div>

Step7: Add pipe in app.module.ts

import{FormatTimePipe} from './components/set-timer/set-timer.component'

 declarations: [
    FormatTimePipe
  ],

Step8: Now, Run the Application

npm start

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