Client-Side Data Processing
Documentation
The DevExtreme JavaScript UI components can get data from a remote storage and process it on the client. This demo shows the Chart component whose data source loads all data from a remote JSON file in one query. Afterwards, different filters are applied to this data depending on a value of the drop-down menu under the chart.
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import React from 'react';
import DataSource from 'devextreme/data/data_source';
import CustomStore from 'devextreme/data/custom_store';
import Chart, {
ValueAxis,
Label,
Legend,
Series,
Size,
Export,
LoadingIndicator
} from 'devextreme-react/chart';
import SelectBox from 'devextreme-react/select-box';
class App extends React.Component {
constructor(props) {
super(props);
this.temperature = [2, 4, 6, 8, 9, 10, 11];
this.palette = ['#c3a2cc', '#b7b5e0', '#e48cba'];
this.paletteIndex = 0;
this.monthWeather = new DataSource({
store: new CustomStore({
load: () => {
return fetch('../../../../data/monthWeather.json')
.then(e => e.json())
.catch(() => { throw 'Data Loading Error'; });
},
loadMode: 'raw'
}),
filter: ['t', '>', '2'],
paginate: false
});
this.customizePoint = () => {
const color = this.palette[this.paletteIndex];
this.paletteIndex = this.paletteIndex === 2 ? 0 : this.paletteIndex + 1;
return { color };
};
this.changeTemperature = (e) => {
this.monthWeather.filter(['t', '>', e.value]);
this.monthWeather.load();
};
}
customizeLabel(e) {
return `${e.valueText}${'°C'}`;
}
render() {
return (
<div id="chart-demo">
<Chart
title="Temperature in Seattle: October 2017"
dataSource={this.monthWeather}
customizePoint={this.customizePoint}>
<Size height={420} />
<ValueAxis>
<Label customizeText={this.customizeLabel} />
</ValueAxis>
<Series
argumentField="day"
valueField="t"
type="bar"
/>
<Legend visible={false} />
<Export enabled={true} />
<LoadingIndicator enabled={true} />
</Chart>
<div className="action">
<SelectBox
id="choose-temperature"
dataSource={this.temperature}
width={70}
defaultValue={2}
onValueChanged={this.changeTemperature} />
<div className="label">Choose a temperature threshold, °C:
</div>
</div>
</div>
);
}
}
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/21.1.6/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/21.1.6/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>
#choose-temperature {
float: right;
}
.action {
width: 320px;
margin-top: 20px;
}
.label {
padding-top: 9px;
}
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@15.7.2/prop-types.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@21.1.6/cjs',
'devextreme-react': 'npm:devextreme-react@21.1.6',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.4.2/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.32/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@3.0.14/dist/dx-gantt.js',
'@devextreme/vdom': 'npm:@devextreme/vdom@1.2.2',
'inferno': 'npm:inferno@7.4.10/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat@7.4.10/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.10/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom@1.0.7/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.10/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.10/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class@7.4.10/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras@7.4.10/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'
},
packages: {
'devextreme': {
defaultExtension: 'js'
},
'@devextreme/vdom': {
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",
],
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
};
System.config(window.config);
[
{ "day": "1", "t": 11 },
{ "day": "2", "t": 7 },
{ "day": "3", "t": 6 },
{ "day": "4", "t": 8 },
{ "day": "5", "t": 7 },
{ "day": "6", "t": 7 },
{ "day": "7", "t": 11 },
{ "day": "8", "t": 9 },
{ "day": "9", "t": 5 },
{ "day": "10", "t": 8 },
{ "day": "11", "t": 6 },
{ "day": "12", "t": 9 },
{ "day": "13", "t": 8 },
{ "day": "14", "t": 6 },
{ "day": "15", "t": 6 },
{ "day": "16", "t": 6 },
{ "day": "17", "t": 10 },
{ "day": "18", "t": 9 },
{ "day": "19", "t": 12 },
{ "day": "20", "t": 9 },
{ "day": "21", "t": 8 },
{ "day": "22", "t": 13 },
{ "day": "23", "t": 9 },
{ "day": "24", "t": 7 },
{ "day": "25", "t": 6 },
{ "day": "26", "t": 11 },
{ "day": "27", "t": 8 },
{ "day": "28", "t": 7 },
{ "day": "29", "t": 9 },
{ "day": "30", "t": 7 },
{ "day": "31", "t": 3 }
]