Progress Bar

import React from 'react'; import { Button } from 'devextreme-react/button'; import { ProgressBar } from 'devextreme-react/progress-bar'; const maxValue = 10; function formatTime(value) { return `00:00:${ (`0${ value}`).slice(-2)}`; } function statusFormat(value) { return `Loading: ${ value * 100 }%`; } let intervalId; class App extends React.Component { constructor(props) { super(props); this.state = { seconds: maxValue, buttonText: 'Start progress', inProgress: false }; this.onButtonClick = this.onButtonClick.bind(this); this.timer = this.timer.bind(this); } render() { return ( <div className="form"> <Button id="progress-button" text={this.state.buttonText} width={200} onClick={this.onButtonClick} /> <div className="progress-info"> Time left {formatTime(this.state.seconds)} </div> <ProgressBar id="progress-bar-status" className={this.state.seconds == 0 ? 'complete' : '' } width="90%" min={0} max={maxValue} statusFormat={statusFormat} value={maxValue - this.state.seconds} /> </div> ); } onButtonClick() { const state = { inProgress: !this.state.inProgress }; if (this.state.inProgress) { state.buttonText = 'Continue progress'; clearInterval(intervalId); } else { state.buttonText = 'Stop progress'; if (this.state.seconds === 0) { state.seconds = maxValue; } intervalId = setInterval(() => this.timer(), 1000); } this.setState(state); } timer() { const state = { seconds: this.state.seconds - 1 }; if (state.seconds == 0) { state.buttonText = 'Restart progress'; state.inProgress = !this.state.inProgress; clearInterval(intervalId); } this.setState(state); } } export default App;