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Simple countdown timer for React.js
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import React, { Component } from 'react'; | |
class CountdownTimer extends Component { | |
state = { | |
time: 30 | |
} | |
componentDidMount() { | |
this.startTimer(); | |
} | |
componentWillUnmount() { | |
this.stopTimer(); | |
} | |
startTimer = () => { | |
clearInterval(this.interval); | |
this.setState({ time: 30 }) | |
this.interval = setInterval(() => { | |
const { time } = this.state; | |
if (time > 0) { | |
this.setState({ time: time - 1 }) | |
} else { | |
this.stopTimer(); | |
} | |
}, 1000) | |
} | |
stopTimer = () => { | |
const { time } = this.state; | |
console.log(`Você parou em ${time} segundos`) | |
clearInterval(this.interval); | |
} | |
render() { | |
const { time } = this.state; | |
return ( | |
<div> | |
<span> | |
{ `Tempo restante: ${time} segundos` } | |
</span> | |
<div> | |
<button type='button' onClick={ this.startTimer }> | |
Iniciar Timer | |
</button> | |
</div> | |
<div> | |
<button type='button' onClick={ this.stopTimer }> | |
Parar Timer | |
</button> | |
</div> | |
</div> | |
); | |
} | |
} | |
export default CountdownTimer; |
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