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;
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(
<App />,
document.getElementById('app')
);
<!DOCTYPE html>
<html>
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import('./index.js');
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"></div>
</div>
</body>
</html>
.form {
padding: 20% 0;
text-align: center;
}
#progress-button {
margin-bottom: 20px;
}
#progress-bar-status {
display: inline-block;
}
.complete .dx-progressbar-range {
background-color: green;
}
System.config({
transpiler: 'plugin-babel',
paths: {
'npm:': 'https://unpkg.com/'
},
defaultExtension: 'js',
map: {
'react': 'npm:react@16/umd/react.development.js',
'react-dom': 'npm:react-dom@16/umd/react-dom.development.js',
'prop-types': 'npm:prop-types/prop-types.js',
'devextreme': 'npm:devextreme@19.2',
'devextreme-react': 'npm:devextreme-react@19.2',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram',
'devexpress-gantt': 'npm:devexpress-gantt',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js',
'systemjs-babel-build':
'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js'
},
packages: {
'devextreme': {
defaultExtension: 'js'
},
'devextreme-react': {
main: 'index.js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
});