SignalR Service
This example demonstrates real-time data update in a DataGrid bound to a SignalR service. Access to the service is configured in a CustomStore.
The CustomStore fetches the remote dataset at launch and keeps its local copy. Whenever the remote dataset changes, the server calls a client-side function that updates the local copy of the dataset (updateStockPrices in this demo). This function uses the store's push(changes) method.
For server-side configuration, refer to the ASP.NET MVC version of this demo.
For more information about integration with push services, refer to the following help topic: Integration with Push Services.
NOTE: Data used in this demo is for demonstration purposes only.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you!
We appreciate your feedback.
We appreciate your feedback.
<template>
<div v-if="connectionStarted">
<DxDataGrid
id="gridContainer"
:data-source="dataSource"
:repaint-changes-only="true"
:highlight-changes="true"
:show-borders="true"
>
<DxColumn
:width="115"
data-field="lastUpdate"
data-type="date"
format="longTime"
/>
<DxColumn
data-field="symbol"
/>
<DxColumn
data-field="price"
data-type="number"
format="#0.####"
cell-template="priceCellTemplate"
/>
<DxColumn
:width="140"
data-field="change"
data-type="number"
format="#0.####"
cell-template="changeCellTemplate"
/>
<DxColumn
data-field="dayOpen"
data-type="number"
format="#0.####"
/>
<DxColumn
data-field="dayMin"
data-type="number"
format="#0.####"
/>
<DxColumn
data-field="dayMax"
data-type="number"
format="#0.####"
/>
<template #priceCellTemplate="{ data: cellData }">
<PriceCell :cell-data="cellData"/>
</template>
<template #changeCellTemplate="{ data: cellData }">
<ChangeCell :cell-data="cellData"/>
</template>
</DxDataGrid>
</div>
</template>
<script>
import {
DxDataGrid,
DxColumn
} from 'devextreme-vue/data-grid';
import CustomStore from 'devextreme/data/custom_store';
import { HubConnectionBuilder, HttpTransportType } from '@aspnet/signalr';
import PriceCell from './PriceCell.vue';
import ChangeCell from './ChangeCell.vue';
export default {
components: {
DxDataGrid,
DxColumn,
PriceCell,
ChangeCell
},
data() {
return {
connectionStarted: false,
dataSource: null
};
},
mounted() {
var hubConnection = new HubConnectionBuilder()
.withUrl('https://js.devexpress.com/Demos/NetCore/liveUpdateSignalRHub', {
skipNegotiation: true,
transport: HttpTransportType.WebSockets
})
.build();
var store = new CustomStore({
load: () => hubConnection.invoke('getAllStocks'),
key: 'symbol'
});
hubConnection
.start()
.then(() => {
hubConnection.on('updateStockPrice', (data) => {
store.push([{ type: 'update', key: data.symbol, data: data }]);
});
this.dataSource = store;
this.connectionStarted = true;
});
}
};
</script>
<style>
#gridContainer span.current-value {
display: inline-block;
margin-right: 5px;
}
#gridContainer span.diff {
width: 50px;
display: inline-block;
}
#gridContainer .inc {
color: #2ab71b;
}
#gridContainer .dec {
color: #f00;
}
#gridContainer .inc .arrow,
#gridContainer .dec .arrow {
display: inline-block;
height: 10px;
width: 10px;
background-repeat: no-repeat;
background-size: 10px 10px;
}
#gridContainer .inc .arrow {
background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAADKSURBVHjaYtTaLs1ABEiG0nPRJa56PEHhsxBhmCUQT4OyrwHxcXyKmQgYJgHE64CYDYrXQcXIMhCbAcgWkGzgNKh38QUB0QamIUUErkhKI9ZAGyCeTERkTYaqxWsgKA2txhdG6GGsvUNGGpeBRMUiGhCFGsqGzUBQQJsxkA5AemaiG5hDIBIIgQSgK0FmMDACs549kN5FZLjhA7+A2A2U9YSAOBeLAk4gnoBDczoOcSFGPIUDPxB/wCHHiKtwYGKgMhg1cBAaCBBgAJTUIL3ToPZfAAAAAElFTkSuQmCC');
}
#gridContainer .dec .arrow {
background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAADJSURBVHjaYvzPgBfgkhYA4o8QFahKmBioDEYNHIQGsgBxIBCLkqgvAYi/g1mMjMjir0EJzR6If/6HpChKMMgMe3DKBeIcKhiY8x/MYoDj+RQYNgdkGLqBbEB8kgzDToL1YjEQhKWB+BUJhj0H64Eahs1AELYhMpJ+gtUiGYbLQBBOI8LANLBaIg1kAAc0vkiAqSPBQFAkHcNi2DGoHMkGgrAENOCRI0ECRQ2JBoKwJTQCfkLZDPgMZPxPXN5NhtJzMSsJVBMAAgwAyWSY2svfmrwAAAAASUVORK5CYII=');
}
</style>
<template>
<div :class="{ inc: cellData.data.change > 0, dec: cellData.data.change < 0 }">
<span class="current-value">{{ cellData.text }}</span>
<span class="arrow"/>
<span class="diff">{{ cellData.data.percentChange.toFixed(2) }}%</span>
</div>
</template>
<script>
export default {
props: {
cellData: {
type: Object,
default: () => {}
}
}
};
</script>
<template>
<div :class="{ inc: cellData.data.change > 0, dec: cellData.data.change < 0 }">
<span>{{ cellData.text }}</span>
</div>
</template>
<script>
export default {
props: {
cellData: {
type: Object,
default: () => {}
}
}
};
</script>
import { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#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/20.2.3/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.3/css/dx.light.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>
System.config({
transpiler: 'plugin-babel',
meta: {
'*.vue': {
loader: 'vue-loader'
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'vue': 'npm:vue@3.0.0/dist/vue.esm-browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@1.0.15/index.js',
'@aspnet/signalr': 'npm:@aspnet/signalr@1.0.0/dist/cjs',
'tslib': 'npm:tslib@2.0.3/tslib.js',
'mitt': 'npm:mitt/dist/mitt.umd.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@20.2.3',
'devextreme-vue': 'npm:devextreme-vue@20.2.3',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.5/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.0/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.0/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.5/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.5/hooks/dist/hooks.js',
'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-vue': {
main: 'index.js'
},
'devextreme': {
defaultExtension: '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
}
});