Timer

Minimal javascript library to create and manage timers

NOTE: Depends on window.requestAnimationFrame. If your environment does not support it, you can polyfill.

API documentation • Demo

Installation

$ npm install @georapbox/timer --save

The library is exported in UMD, CommonJS, and ESM formats. You can import it the following ways:

Using ESM import statement

import Timer from '@georapbox/timer';

Using CommonJS require statement

const Timer = require('@georapbox/timer');

As old school browser global

<script src="https://unpkg.com/@georapbox/timer/dist/Timer.umd.min.js"></script>

API

• Timer
  • new Timer(elapsedTime, duration, [callback])
  • .time() ⇒ Object
  • .start() ⇒ Timer
  • .stop() ⇒ Timer
  • .reset() ⇒ Timer
  • .isRunning() ⇒ Boolean

new Timer(elapsedTime, duration, [callback])

Timer constructor: Creates a new Timer instance.

Throws:

• TypeError If duration is not a number or NaN.
• TypeError If elapsedTime is not a number or NaN.

Param	Type	Description
elapsedTime	Number	The time that has elapsed in milliseconds. If a negative number provided, it will become 0. If a number greater than duration is provided, it will become equal to duration.
duration	Number	The timer's duration in milliseconds. If a negative number provided, it will become 0.
[callback]	function	Function to be executed while timer is running. The Timer instance is passed by as parameter.

timer.time() ⇒ Object

Get the remaining and elapsed time.

Kind: instance method of Timer
Returns: Object - An object literal that contains the remaining and the elapsed time in milliseconds.

timer.start() ⇒ Timer

Starts the timer. If the timer instance has been already started, the timer will just resume.

Kind: instance method of Timer
Returns: Timer - The Timer instance.

timer.stop() ⇒ Timer

Stops/Pauses the timer.

Kind: instance method of Timer
Returns: Timer - The Timer instance.

timer.reset() ⇒ Timer

Resets the timer to its initial state.

Kind: instance method of Timer
Returns: Timer - The Timer instance.

timer.isRunning() ⇒ Boolean

Checks (at any time) if the timer is running or not.

Kind: instance method of Timer
Returns: Boolean - true if the timer is running; otherwise false.

License

The MIT License (MIT)