John Siu Blog

ng2-simple-timer is a simple timer service for Angular, base on RxJS.

Name/ID(string) base API. RxJS object not exposed.

ng2-simple-timer uses to Angular CLI starting 8.2.0. New repository github.com/J-Siu/ng2-simple-timer-lib contains both library and example.

Version < 8.2.0 are in old repository github.com/J-Siu/ng2-simple-timer

Install

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npm install ng2-simple-timer

Usage

ng2-simple-timer is implemented as Angular injectable service name SimpleTimer.

Module

Add SimpleTimer into module providers (eg. app.module.ts.

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import { SimpleTimer } from 'ng2-simple-timer';

@NgModule({
  providers: [SimpleTimer]
})

Component

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import {SimpleTimer} from 'ng2-simple-timer';

export class ChildComponent {

  constructor(private st: SimpleTimer) { }

}

API

newTimer

Create timer with optional delay start. Unit in second.

newTimer(name: string, sec: number, delay: boolan = false): boolean

newTimer will create timer name and tick every ’number’ of seconds. Creating timer with the same name multiple times has no side effect.

delay: If set to true will delay the 1st tick till the end of the first interval.

Return false if timer name exist.

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this.st.newTimer('5sec', 5);
this.st.newTimer('5sec', 5, true);

newTimerCD

Create timer with optional customer delay. Unit in second.

newTimerCD(name: string, sec: number, delay: number = 0): boolean

newTimerCD will create timer name and tick every ’number’ of seconds. Creating timer with the same name multiple times has no side effect.

delay: If set to X, will delay the 1st tick for X seconds.

Return false if timer name exist.

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this.st.newTimerCD('5sec', 5);
this.st.newTimerCD('5sec', 5, 10);

newTimerHR

Create High Resolution timer with optional customer delay. Unit in millisecond.

newTimerHR(name: string, msec: number, delay: number = 0): boolean

newTimerHR will create timer name and tick every ’number’ of milliseconds. Creating timer with the same name multiple times has no side effect.

delay: If set to X, will delay the 1st tick for X milliseconds.

Return false if timer name exist.

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this.st.newTimerHR('5ms', 5);
this.st.newTimerHR('5ms', 5, 10);

delTimer

delTimer(name: string): boolean

delTimer will delete timer name

Return false if timer name does not exist.

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this.st.delTimer('5sec');

getTimer

getTimer(): string[]

getTimer will return all timer name in string array.

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let t: string[] = this.st.getTimer();

getSubscription

getSubscription(): string[]

getSubscription will return all subscription id in string array.

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let ids: string[] = this.st.getSubscription();

subscribe

subscribe(name: string, callback: () => void): string

subscribe will link callback function to timer name. Whenever timer name tick, callback will be invoked.

Return subscription id(string).

Return empty string if timer name does not exist.

Either use Lambda(fat arrow) in typescript to pass in callback or bind this to another variable in javascript, else this scope will be lost.

Lambda(fat arrow)

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counter: number = 0;
timerId: string;

ngOnInit() {
  // lazy mode
  this.timerId = this.st.subscribe('5sec', () => this.callback());
}

callback() {
  this.counter++;
}

unsubscribe

unsubscribe(id: string): boolean

unsubscribe will cancel subscription using id.

unsubscribe will return false if id is undefined or id is not found in subscription list.

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timerId: string;

this.st.unsubscribe(this.timerId);

Example

You will need Angular CLI to build the library and run the example.

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git clone https://github.com/J-Siu/ng2-simple-timer-lib.git
cd ng2-simple-timer-lib
npm i
ng build ng2-simple-timer
ng serve --open

Repository

• ng2-simple-timer-lib

Contributors

• John Sing Dao Siu

Changelog

• 0.2.0
  • Angular 2 RC4
• 0.2.2
  • API change
  • newTimer() return boolean
  • subscribe() - lazy mode removed
  • API new
  • delTimer()
• 0.2.3
  • Support Angular 2 RC5
• 0.2.4
  • Remove module, export SimpleTimer only
• 1.2.4
  • Support Angular 2.0.0
  • Clean up package
• 1.2.5
  • Add Plunker example
• 1.2.7
  • Support Angular 2.4.*
  • Replace node-uuid with uuid
• 1.2.8
  • Change uuid as dependency
• 1.2.9
  • Replace uuid with angular2-uuid
• 1.3.0
  • Add instruction for "noImplicitAny": false
  • Clean up package
• 1.3.1
  • Due to the rapid release cycle of Angular, to minimize update purely due to peerDependencies, it is modified as follow: "peerDependencies": { "@angular/core": ">=2.4.0" }
• 1.3.2
  • Update package.json for Angular 4.3.1. For Angular 2.x.x, please use 1.3.1 or earlier.
  • Fix readme example code syntax error.
  • API change: subscribe(name: string, callback: (any) => void): string change to subscribe(name: string, callback: () => void): string
• 1.3.3
  • Fix readme example code for subscribe
• 1.3.4
  • Add delay option for newTimer
• 1.3.5
  • Bug fix for newTimer
  • 6.0.0
  • Update for Angular 6.x, which include moving from RxJS 5.1 to 6.0
  • Update version to match major version of Angular
• 8.2.0
  • Support Angular 8.2.0
  • Switch to Angular Cli for faster update
  • Include example
• 8.2.1
  • README.md clean up
• 8.2.2
  • New APIs
    • newTimerCD Create timer with optional custom delay start. Unit in second.
    • newTimerHR Create timer with optional custom delay start. Unit in millisecond.

License

The MIT License

Copyright (c) 2019

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.