Sr-timer NPM | npm.io

srTimer

Simple javascript timer application. Originally made to run my cube timer app at http://www.solvingrubik.com/ Can easily be included and configured to work on any webpage.

Instalation

Download the timer.js file and put it in your web directory.

Install the package using npm

npm install --save sr-timer

Usage

Import the library

import SRTimer from 'sr-timer'

Create a new instance of the timer. The timer will automatically bind to window key events to listen for the spacebar to start / stop the timer.

let timer = new SRTimer()

Optionally an alternate keycode can be passed in to the constructor customize what key is listens for.

let timer = new SRTimer(65) // use 'A' key

If you don't want the timer to bind to window events you can pass in null as the timer key.

let timer = new SRTimer(null) // start / stop timer manually
timer.start()
...
timer.stop()
const elapsed = timer.getElapsedTime()

When you no longer need the timer make sure to call unbind to stop listening for keyevents

timer.unbind();
delete timer;

Registering Listeners

Listeners can be registered to receive events when the timer starts, stops, ticks, or resets. This allows the timer to call your custom code to fit any of your application's needs.

timer.addStartListener(() => {
  console.log('timer started')
})

timer.addStopListener(stopEvent => {
  console.log(`elapsed time ${stopEvent.time}`)
})

API

Method	Description	Example
`start()`	starts the timer	`timer.start()`
`stop()`	stops the timer and sets the elapsed time.	`timer.stop()`
`reset()`	resets the timer and sets elapsed time back to 0	`timer.reset()`
`isRunning()`	returns true if the timer is currently started	`timer.isRunning()`
`getElapsedTime()`	Gives the current elapsed time as a formatted string	`let elapsed = timer.getElapsedTime()`
`addStartListener(listener: () => void)`	register listener for when the timer starts	`timer.addStartListener(() => { console.log('started') })`
`addStopListener(listener: (event: TimerEvent) => void)`	register listener for when the timer stops	`timer.addStopListener(event => { console.log('stopped', event) })`
`addResetListener(listener: () => void)`	register listener for when the timer resets	`timer.addResetListener(() => { console.log('reset') })`
`addTickListener(listener: (event: TimerEvent) => void)`	register listener for when the timer ticks	`timer.addTickListener(event => { console.log('tick', event) })`