SignalR Service
Documentation
This example demonstrates real-time data update in a financial chart bound to a SignalR server. Note that data used in this demo is for demonstration purposes only.
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<div ng-if="connectionStarted">
<dx-chart
id="chart"
[dataSource]="dataSource"
title="Stock Price"
[customizePoint]="customizePoint"
>
<dxi-series pane="Price" argumentField="date" type="candlestick">
<dxo-aggregation
[enabled]="true"
method="custom"
[calculate]="calculateCandle"
>
</dxo-aggregation>
</dxi-series>
<dxi-series
pane="Volume"
name="Volume"
argumentField="date"
valueField="volume"
color="red"
type="bar"
>
<dxo-aggregation [enabled]="true" method="sum"> </dxo-aggregation>
</dxi-series>
<dxi-pane name="Price"></dxi-pane>
<dxi-pane name="Volume" [height]="80"></dxi-pane>
<dxo-tooltip
[enabled]="true"
[shared]="true"
argumentFormat="shortDateShortTime"
contentTemplate="tooltipTemplate"
></dxo-tooltip>
<dxo-crosshair
[enabled]="true"
[horizontalLine]="{ visible: false }"
></dxo-crosshair>
<dxo-margin [right]="30"></dxo-margin>
<dxo-scroll-bar [visible]="true"></dxo-scroll-bar>
<dxo-legend [visible]="false"></dxo-legend>
<dxi-value-axis [placeholderSize]="50"></dxi-value-axis>
<dxo-zoom-and-pan argumentAxis="both"></dxo-zoom-and-pan>
<dxo-argument-axis
argumentType="datetime"
[minVisualRangeLength]="{ minutes: 10 }"
[visualRange]="{ length: 'hour' }"
></dxo-argument-axis>
<dxo-loading-indicator [enabled]="true"></dxo-loading-indicator>
<div *dxTemplate="let pointInfo of 'tooltipTemplate'">
<div class="tooltip-template">
<div>{{ pointInfo.argumentText }}</div>
<div>
<span>Open: </span>
{{ formatPrice(pointInfo.points, "openValue") }}
</div>
<div>
<span>High: </span>
{{ formatPrice(pointInfo.points, "highValue") }}
</div>
<div>
<span>Low: </span>
{{ formatPrice(pointInfo.points, "lowValue") }}
</div>
<div>
<span>Close: </span>
{{ formatPrice(pointInfo.points, "closeValue") }}
</div>
<div>
<span>Volume: </span>
{{ formatVolume(pointInfo.points) }}
</div>
</div>
</div>
</dx-chart>
</div>
import {
NgModule, Component, ViewChild, enableProdMode,
} from '@angular/core';
import { DecimalPipe, CurrencyPipe } from '@angular/common';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { HubConnectionBuilder, HttpTransportType } from '@aspnet/signalr';
import { DxChartModule, DxChartComponent } from 'devextreme-angular';
import CustomStore from 'devextreme/data/custom_store';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
providers: [DecimalPipe, CurrencyPipe],
})
export class AppComponent {
@ViewChild(DxChartComponent, { static: false }) component: DxChartComponent;
dataSource: any;
connectionStarted: boolean;
constructor(private decimalPipe: DecimalPipe, private currencyPipe: CurrencyPipe) {
this.connectionStarted = false;
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: any) => {
store.push([{ type: 'insert', key: data.date, data }]);
});
this.dataSource = store;
this.connectionStarted = true;
});
}
calculateCandle(e) {
const prices = e.data.map((d) => d.price);
if (prices.length) {
return {
date: new Date((e.intervalStart.valueOf() + e.intervalEnd.valueOf()) / 2),
open: prices[0],
high: Math.max.apply(null, prices),
low: Math.min.apply(null, prices),
close: prices[prices.length - 1],
};
}
}
customizePoint = (arg: any) => {
if (arg.seriesName === 'Volume') {
const point = this.component.instance.getAllSeries()[0].getPointsByArg(arg.argument)[0].data;
if (point.close >= point.open) {
return { color: '#1db2f5' };
}
}
};
formatPrice = (points: any, field: any) => {
const pricePoint = points.filter((point) => point.seriesName !== 'Volume')[0];
return this.currencyPipe.transform(pricePoint[field], 'USD', 'symbol', '1.0-0');
};
formatVolume = (points: any) => {
const volPoint = points.filter((point) => point.seriesName === 'Volume')[0];
return this.decimalPipe.transform(volPoint.value, '3.0-0');
};
}
@NgModule({
imports: [
BrowserModule,
DxChartModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #chart {
height: 440px;
}
::ng-deep .tooltip-template span {
font-weight: 500;
}
// In real applications, you should not transpile code in the browser.
// You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
map: {
'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
'typescript': 'npm:typescript@3.5.3/lib/typescript.js',
'@angular/core': 'npm:@angular/core@12.2.15',
'@angular/platform-browser': 'npm:@angular/platform-browser@12.2.15',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.15',
'@angular/forms': 'npm:@angular/forms@12.2.15',
'@angular/common': 'npm:@angular/common@12.2.15',
'@angular/compiler': 'npm:@angular/compiler@12.2.15',
'tslib': 'npm:tslib@2.3.1/tslib.js',
'rxjs': 'npm:rxjs@6.4.0',
'@aspnet/signalr': 'npm:@aspnet/signalr@1.0.0/dist/cjs/index.js',
'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@21.2.5/cjs',
'devextreme/bundles/dx.all': 'npm:devextreme@21.2.5/bundles/dx.all.js',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.5.11/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.45',
'devexpress-gantt': 'npm:devexpress-gantt@4.0.3',
'devextreme-angular': 'npm:devextreme-angular@21.2.5',
'@devextreme/runtime': 'npm:@devextreme/runtime@2.3.14',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat@7.4.11/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.11/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class@7.4.11/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras@7.4.11/dist/inferno-extras.min.js',
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts',
},
'devextreme': {
defaultExtension: 'js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@2.3.14/inferno/package.json',
'npm:@angular/*/package.json',
'npm:@angular/common@12.2.15/*/package.json',
'npm:rxjs@6.4.0/package.json',
'npm:rxjs@6.4.0/operators/package.json',
'npm:devextreme-angular@21.2.5/*/package.json',
'npm:devextreme-angular@21.2.5/ui/*/package.json',
'npm:devextreme-angular@21.2.5/package.json',
'npm:devexpress-diagram@2.1.45/package.json',
'npm:devexpress-gantt@4.0.3/package.json',
'npm:@aspnet/*/package.json',
],
};
System.config(window.config);
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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/21.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.2.5/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.11.4/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="config.js"></script>
<script>
System.import("app").catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>
using System.Collections.Generic;
using DevExtreme.MVC.Demos.Models.SignalRTickData;
using Microsoft.AspNet.SignalR;
namespace DevExtreme.MVC.Demos.Hubs {
public class StockTickDataHub : Hub {
private readonly TickDataService _service;
public StockTickDataHub() {
_service = TickDataService.Instance;
}
public IEnumerable<TickItem> GetAllData() {
return _service.GetAllData();
}
}
}
using DevExtreme.MVC.Demos.Hubs;
using Microsoft.AspNet.SignalR;
using Microsoft.AspNet.SignalR.Hubs;
using System;
using System.Collections.Generic;
using System.Threading;
namespace DevExtreme.MVC.Demos.Models.SignalRTickData {
public class TickDataService {
public readonly static TickDataService Instance = new TickDataService(GlobalHost.ConnectionManager.GetHubContext<StockTickDataHub>().Clients);
private IHubConnectionContext<dynamic> Clients { get; set; }
private readonly object updateStockPricesLock = new object();
private TickItem[] tickData;
private int lastTickIndex;
private Timer timer;
private TickDataService(IHubConnectionContext<dynamic> clients) {
Clients = clients;
tickData = GenerateTestData();
lastTickIndex = tickData.Length - 1;
timer = new Timer(Update, null, 1000, 1000);
}
public IEnumerable<TickItem> GetAllData() {
var data = new List<TickItem>();
lock(updateStockPricesLock) {
for(var i = lastTickIndex; data.Count < 10000; i--) {
data.Add(tickData[i]);
if(i == 0) {
i = tickData.Length - 1;
}
}
}
return data;
}
private void Update(object state) {
lock(updateStockPricesLock) {
lastTickIndex = (lastTickIndex + 1) % tickData.Length;
var tick = tickData[lastTickIndex];
tick.Date = DateTime.Now;
BroadcastStockPrice(tick);
}
}
private void BroadcastStockPrice(TickItem item) {
Clients.All.updateStockPrice(item);
}
private TickItem[] GenerateTestData() {
var lastPrice = 140m;
var random = new Random();
var slowRandomValue = random.NextDouble();
var data = new TickItem[60 * 60 * 20];
var curTime = DateTime.Now;
for(var i = 0; i < data.Length / 2; i++) {
lastPrice = Math.Round(lastPrice * (decimal)(1 + 0.002 * (-1 + 2 * random.NextDouble())), 2);
if(i % 50 == 0) {
slowRandomValue = random.NextDouble();
if(slowRandomValue > 0.3 && slowRandomValue <= 0.5) slowRandomValue -= 0.2;
if(slowRandomValue > 0.5 && slowRandomValue <= 0.7) slowRandomValue += 0.2;
}
var volume = (int)(100 + 1900 * random.NextDouble() * slowRandomValue);
data[data.Length - 1 - i] = new TickItem(lastPrice, volume, curTime.AddSeconds(-1 * i));
data[i] = new TickItem(lastPrice, volume, curTime.AddSeconds(-1 * (data.Length - 1 - i)));
}
return data;
}
}
}