Server-Side Data Processing
In many cases, you need to process data on the server before a chart displays it. The Chart component supports this scenario.
In this demo, the data source of the Chart loads weather data for a selected month from an OData service. Each time you select a different month in the drop-down menu, the data source sends a new query to the service. To implement this functionality, assign a DataSource object to the Chart's dataSource property.
In the DataSource, implement the ODataStore. An OData service can include multiple entity collections related to each other, but the ODataStore specifies only one collection. To load multiple collections at once, set the expand property to an array with the additional collection titles. Then, call the postProcess function to process additional data.
Set the paginate property to false to prevent data from partitioning. You can also apply a filter to the received values.
Once you load the data, specify the series type and its nested options (argumentField and valueField), so the component can determine the objects that indicate Chart arguments and values in the data source.
www.wikipedia.org
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.
import React from 'react';
import DataSource from 'devextreme/data/data_source';
import 'devextreme/data/odata/store';
import Chart, {
ValueAxis,
ArgumentAxis,
CommonPaneSettings,
Grid,
Series,
Label,
Legend,
Size,
Border,
Tooltip,
Export,
LoadingIndicator,
} from 'devextreme-react/chart';
import SelectBox from 'devextreme-react/select-box';
import { months } from './data.js';
class App extends React.Component {
constructor(props) {
super(props);
this.chartDataSource = new DataSource({
store: {
type: 'odata',
url: 'https://js.devexpress.com/Demos/WidgetsGallery/odata/WeatherItems',
},
postProcess(results) {
return results[0].DayItems;
},
expand: 'DayItems',
filter: ['Id', '=', 1],
paginate: false,
});
this.onValueChanged = (data) => {
this.chartDataSource.filter(['Id', '=', data.value]);
this.chartDataSource.load();
};
}
render() {
return (
<div id="chart-demo">
<Chart
title="Temperature in Seattle , 2017"
dataSource={this.chartDataSource}>
<Size height={420} />
<ValueAxis
valueType="numeric"
>
<Grid opacity={0.2} />
<Label customizeText={this.customizeLabel} />
</ValueAxis>
<ArgumentAxis type="discrete">
<Grid visible={true} opacity={0.5} />
</ArgumentAxis>
<CommonPaneSettings>
<Border
visible={true}
width={2}
top={false}
right={false}
/>
</CommonPaneSettings>
<Series
argumentField="Number"
valueField="Temperature"
type="spline"
/>
<Legend visible={false} />
<Export enabled={true} />
<Tooltip
enabled={true}
customizeTooltip={customizeTooltip} />
<LoadingIndicator enabled={true} />
</Chart>
<div className="action">
<div className="label">Choose a month:
</div>
<SelectBox
id="selectbox"
width={150}
valueExpr="id"
displayExpr="name"
items={months}
defaultValue={1}
onValueChanged={this.onValueChanged} />
</div>
</div>
);
}
customizeLabel(e) {
return `${e.valueText}${'°C'}`;
}
}
function customizeTooltip(arg) {
return {
text: `${arg.valueText}${'°C'}`,
};
}
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/22.2.3/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="https://unpkg.com/core-js@2.6.12/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>
.action {
width: 270px;
margin-top: 20px;
display: flex;
justify-content: space-between;
align-items: center;
}
export const months = [{
id: 1,
name: 'January',
}, {
id: 2,
name: 'February',
}, {
id: 3,
name: 'March',
}, {
id: 4,
name: 'April',
}, {
id: 5,
name: 'May',
}, {
id: 6,
name: 'June',
}, {
id: 7,
name: 'July',
}, {
id: 8,
name: 'August',
}, {
id: 9,
name: 'September',
}, {
id: 10,
name: 'October',
}, {
id: 11,
name: 'November',
}, {
id: 12,
name: 'December',
}];
window.config = {
transpiler: 'plugin-babel',
meta: {
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
defaultExtension: 'js',
map: {
'react': 'npm:react@17.0.2/umd/react.development.js',
'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
'prop-types': 'npm:prop-types@15.8.1/prop-types.js',
'rrule': 'npm:rrule@2.6.4/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@22.2.3/cjs',
'devextreme-react': 'npm:devextreme-react@22.2.3',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.5.18/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.65/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.37/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.11',
'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',
// 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',
// Prettier
'prettier/standalone': 'npm:prettier@2.7.1/standalone.js',
'prettier/parser-html': 'npm:prettier@2.7.1/parser-html.js',
},
packages: {
'devextreme': {
defaultExtension: 'js',
},
'devextreme-react': {
main: 'index.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@3.0.11/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true,
},
};
System.config(window.config);