import React from 'react';
import Chart, {
ArgumentAxis,
ValueAxis,
Aggregation,
Legend,
Series,
ScrollBar,
ZoomAndPan,
LoadingIndicator,
Pane,
Tooltip,
Crosshair
} from 'devextreme-react/chart';
import CustomStore from 'devextreme/data/custom_store';
import { HubConnectionBuilder, HttpTransportType } from '@aspnet/signalr';
import TooltipTemplate from './TooltipTemplate.js';
class App extends React.Component {
constructor(props) {
super(props);
this.state = { dataSource: null };
const hubConnection = new HubConnectionBuilder()
.withUrl('https://js.devexpress.com/Demos/NetCore/stockTickDataHub', {
skipNegotiation: true,
transport: HttpTransportType.WebSockets
})
.build();
const store = new CustomStore({
load: () => hubConnection.invoke('getAllData'),
key: 'date'
});
hubConnection
.start()
.then(() => {
hubConnection.on('updateStockPrice', (data) => {
store.push([{ type: 'insert', key: data.date, data: data }]);
});
this.setState({ dataSource: store });
});
this.customizePoint = this.customizePoint.bind(this);
this.storeChartRef = (ref) => { this.chartRef = ref; };
}
calculateCandle(e) {
const prices = e.data.map(d => d.price);
if (prices.length) {
return {
date: e.intervalStart,
open: prices[0],
high: Math.max.apply(null, prices),
low: Math.min.apply(null, prices),
close: prices[prices.length - 1]
};
}
}
render() {
return (
<div>
<Chart
id="chart"
ref={this.storeChartRef}
dataSource={this.state.dataSource}
margin={{ right: 30 }}
title="Stock Price"
customizePoint={this.customizePoint}>
<Series
pane="Price"
argumentField="date"
type="CandleStick">
<Aggregation
enabled={true}
method="custom"
calculate={this.calculateCandle} />
</Series>
<Series
pane="Volume"
name="Volume"
argumentField="date"
valueField="volume"
color="red"
type="bar">
<Aggregation
enabled={true}
method="sum" />
</Series>
<Pane name="Price"></Pane>
<Pane name="Volume" height={80}></Pane>
<Legend visible={false} />
<ArgumentAxis
argumentType="datetime"
minVisualRangeLength={{ minutes: 10 }}
defaultVisualRange={{ length: 'hour' }} />
<ValueAxis placeholderSize={50} />
<ZoomAndPan argumentAxis="both" />
<ScrollBar visible={true} />
<LoadingIndicator enabled={true} />
<Tooltip
enabled={true}
shared={true}
argumentFormat="shortDateShortTime"
contentRender={TooltipTemplate}
/>
<Crosshair
enabled={true}
horizontalLine={{ visible: false }}
/>
</Chart>
</div>
);
}
customizePoint(arg) {
if(arg.seriesName === 'Volume') {
var point = this.chartRef.instance.getAllSeries()[0].getPointsByArg(arg.argument)[0].data;
if(point && point.close >= point.open) {
return { color: '#1db2f5' };
}
}
}
}
export default App;
import React from 'react';
const formatCurrency = new Intl.NumberFormat('en-US',
{ style: 'currency', currency: 'USD', minimumFractionDigits: 0 }
).format;
const formatNumber = new Intl.NumberFormat('en-US', {
minimumFractionDigits: 0
}).format;
export default function TooltipTemplate(pointInfo) {
const volume = pointInfo.points.filter(point => point.seriesName === 'Volume')[0];
const prices = pointInfo.points.filter(point => point.seriesName !== 'Volume')[0];
return (
<div className="tooltip-template">
<div>{ pointInfo.argumentText }</div>
<div><span>Open: </span>
{ formatCurrency(prices.openValue) }
</div>
<div><span>High: </span>
{ formatCurrency(prices.highValue) }
</div>
<div><span>Low: </span>
{ formatCurrency(prices.lowValue) }
</div>
<div><span>Close: </span>
{ formatCurrency(prices.closeValue) }
</div>
<div><span>Volume: </span>
{ formatNumber(volume.value) }
</div>
</div>
);
}
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/20.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.5/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>
#chart {
height: 440px;
}
.tooltip-template span {
font-weight: 500;
}
System.config({
transpiler: 'plugin-babel',
meta: {
'devextreme/localization.js': {
"esModule": true
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
defaultExtension: 'js',
map: {
'react': 'npm:react@16.14.0/umd/react.development.js',
'react-dom': 'npm:react-dom@16.14.0/umd/react-dom.development.js',
'prop-types': 'npm:prop-types@15.7.2/prop-types.js',
'@aspnet/signalr': 'npm:@aspnet/signalr@1.0.0/dist/cjs',
'tslib': 'npm:tslib@2.1.0/tslib.js',
'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@20.2.5',
'devextreme-react': 'npm:devextreme-react@20.2.5',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.8/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.11/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.18/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.11/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.11/hooks/dist/hooks.js',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js'
},
packages: {
'devextreme': {
defaultExtension: 'js'
},
'devextreme-react': {
main: 'index.js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
'@aspnet/signalr': {
main: 'index.js',
defaultExtension: 'js'
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
});