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"
(onZoomEnd)="zoomEnd($event)"
title="Stock Price">
<dxi-series
argumentField="date"
type="candlestick">
<dxo-aggregation
[enabled]="true"
method="custom"
[calculate]="calculateCandle">
</dxo-aggregation>
</dxi-series>
<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"
[valueMarginsEnabled]="false"
[visualRange]="{length: 'hour'}"
></dxo-argument-axis>
<dxo-loading-indicator [enabled]="true"></dxo-loading-indicator>
</dx-chart>
</div>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { HubConnectionBuilder } from '@aspnet/signalr';
import { DxChartModule } 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']
})
export class AppComponent {
dataSource: any;
connectionStarted: boolean;
constructor() {
this.connectionStarted = false;
var hubConnection = new HubConnectionBuilder()
.withUrl("https://js.devexpress.com/Demos/NetCore/stockTickDataHub")
.build();
var 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: data }]);
});
this.dataSource = store;
this.connectionStarted = true;
});
}
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]
};
}
}
zoomEnd(e) {
if (e.range.endValue - e.range.startValue < 1000 * 60 * 10) {
e.cancel = true;
}
}
}
@NgModule({
imports: [
BrowserModule,
DxChartModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #chart {
height: 440px;
}
// 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://github.com/DevExpress/devextreme-angular/blob/master/README.md
System.config({
transpiler: 'ts',
typescriptOptions: {
module: "commonjs",
emitDecoratorMetadata: true,
experimentalDecorators: true
},
meta: {
'typescript': {
"exports": "ts"
}
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
'typescript': 'npm:typescript@3.4.5/lib/typescript.js',
'@angular/core': 'npm:@angular/core@8.0.0/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common@8.0.0/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler@8.0.0/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser@8.0.0/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@8.0.0/bundles/platform-browser-dynamic.umd.js',
'@angular/router': 'npm:@angular/router@8.0.0/bundles/router.umd.js',
'@angular/forms': 'npm:@angular/forms@8.0.0/bundles/forms.umd.js',
'@angular/common/http': 'npm:@angular/common@8.0.0/bundles/common-http.umd.js',
'@aspnet/signalr': 'npm:@aspnet/signalr@1.0.0/dist/cjs/index.js',
'tslib': 'npm:tslib/tslib.js',
'rxjs': 'npm:rxjs@6.3.3',
'rxjs/operators': 'npm:rxjs@6.3.3/operators',
'devextreme': 'npm:devextreme@19.1',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.6/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram',
'devextreme-angular': 'npm:devextreme-angular@19.1'
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts'
},
'devextreme': {
defaultExtension: 'js'
},
'rxjs': { main: 'index.js', defaultExtension: 'js' },
'rxjs/operators': { main: 'index.js', defaultExtension: 'js' },
'devextreme-angular': {
main: 'index.js',
defaultExtension: 'js'
}
}
});
<!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/19.1.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.5/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@0.6.25/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>