react-compound-timerv2

About

This is a forked version of the original react-compound-timer compatible with React 17.

Timer compound component for react and react-native to make building timers less painfull. It incapsulates all timer logic - you should only think about rendering!

See Working Examples

Forward Count

Just render a simple timer and start counting forward from 0. Use compound components to render time units. You can see all avaliable time units in this example.

<Timer>
  <Timer.Days /> days
  <Timer.Hours /> hours
  <Timer.Minutes /> minutes
  <Timer.Seconds /> seconds
  <Timer.Milliseconds /> milliseconds
</Timer>

Backward Count

The same simple timer, but counting backward.

<Timer initialTime={55000} direction="backward">
  {() => (
    <React.Fragment>
      <Timer.Days /> days
      <Timer.Hours /> hours
      <Timer.Minutes /> minutes
      <Timer.Seconds /> seconds
      <Timer.Milliseconds /> milliseconds
    </React.Fragment>
  )}
</Timer>

Controls

Get action functions from props and use them to control your timer.

<Timer initialTime={55000}>
  {({ start, resume, pause, stop, reset, timerState }) => (
    <React.Fragment>
      <div>
        <Timer.Days /> days
        <Timer.Hours /> hours
        <Timer.Minutes /> minutes
        <Timer.Seconds /> seconds
        <Timer.Milliseconds /> milliseconds
      </div>
      <div>{timerState}</div>
      <br />
      <div>
        <button onClick={start}>Start</button>
        <button onClick={pause}>Pause</button>
        <button onClick={resume}>Resume</button>
        <button onClick={stop}>Stop</button>
        <button onClick={reset}>Reset</button>
      </div>
    </React.Fragment>
  )}
</Timer>

No autoplay

You can just render a timer, and then start it only by using action function 'start' from props.

<Timer initialTime={55000} startImmediately={false}>
  {({ start, resume, pause, stop, reset, timerState }) => (
    <React.Fragment>
      <div>
        <Timer.Days /> days
        <Timer.Hours /> hours
        <Timer.Minutes /> minutes
        <Timer.Seconds /> seconds
        <Timer.Milliseconds /> milliseconds
      </div>
      <div>{timerState}</div>
      <br />
      <div>
        <button onClick={start}>Start</button>
        <button onClick={pause}>Pause</button>
        <button onClick={resume}>Resume</button>
        <button onClick={stop}>Stop</button>
        <button onClick={reset}>Reset</button>
      </div>
    </React.Fragment>
  )}
</Timer>

With hooks

Write your own hooks on timer actions.

<Timer
  initialTime={55000}
  startImmediately={false}
  onStart={() => console.log("onStart hook")}
  onResume={() => console.log("onResume hook")}
  onPause={() => console.log("onPause hook")}
  onStop={() => console.log("onStop hook")}
  onReset={() => console.log("onReset hook")}
>
  {({ start, resume, pause, stop, reset, timerState }) => (
    <React.Fragment>
      <div>
        <Timer.Days /> days
        <Timer.Hours /> hours
        <Timer.Minutes /> minutes
        <Timer.Seconds /> seconds
        <Timer.Milliseconds /> milliseconds
      </div>
      <div>{timerState}</div>
      <br />
      <div>
        <button onClick={start}>Start</button>
        <button onClick={pause}>Pause</button>
        <button onClick={resume}>Resume</button>
        <button onClick={stop}>Stop</button>
        <button onClick={reset}>Reset</button>
      </div>
    </React.Fragment>
  )}
</Timer>

Last Unit Property

Control your last unit. For example, 1 minute 30 seconds can be 90 seconds, if you set lastUnit as 'seconds'. It means that minutes, hours and days will not be computed.

<Timer initialTime={60000 * 60 * 48 + 5000} lastUnit="h" direction="backward">
  {() => (
    <React.Fragment>
      <Timer.Days /> days
      <Timer.Hours /> hours
      <Timer.Minutes /> minutes
      <Timer.Seconds /> seconds
      <Timer.Milliseconds /> milliseconds
    </React.Fragment>
  )}
</Timer>

With checkpoints

If you need to call some functions on certain time - provide checkpoints property. It is an array of objects. Each object contains time and callback, that will be fired, when timer intersects checkpoint's time.

<Timer
  initialTime={60000 * 60 * 48 + 5000}
  direction="backward"
  checkpoints={[
    {
      time: 60000 * 60 * 48,
      callback: () => console.log("Checkpoint A"),
    },
    {
      time: 60000 * 60 * 48 - 5000,
      callback: () => console.log("Checkpoint B"),
    },
  ]}
>
  {() => (
    <React.Fragment>
      <Timer.Days /> days
      <Timer.Hours /> hours
      <Timer.Minutes /> minutes
      <Timer.Seconds /> seconds
      <Timer.Milliseconds /> milliseconds
    </React.Fragment>
  )}
</Timer>

React Native

Timer compound component also works for react-native applications. All you have to do is wrap the elements in a tag from react-native.

Countdown example with milliseconds

import { View, Text } from "react-native";
import Timer from "react-compound-timer";

<View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
  <Timer
    initialTime={60 * 1000}
    direction="backward"
    timeToUpdate={10}
    checkpoints={[
      {
        time: 0,
        callback: () => alert("countdown finished"),
      },
    ]}
  >
    <Text style={{ fontFamily: "Helvetica Neue" }}>
      <Text style={{ fontSize: 32 }}>
        <Timer.Seconds />
      </Text>
      <Text style={{ fontSize: 12 }}>
        <Timer.Milliseconds />
      </Text>
    </Text>
  </Timer>
</View>;