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Discrete scale
Documentation
In this demo, a discrete scale is used to select a range within a set of categories.
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import React from 'react';
import RangeSelector, { Chart, Series } from 'devextreme-react/range-selector';
import { dataSource } from './data.js';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
totalProduction: calculateTotalProduction()
};
this.processRange = this.processRange.bind(this);
}
render() {
return (
<div id="range-selector-demo">
<RangeSelector
id="range-selector"
title="Copper Production in 2013"
dataSource={dataSource}
onValueChanged={this.processRange}
>
<Chart>
<Series type="bar" argumentField="country" valueField="copper" />
</Chart>
</RangeSelector>
<h2>Total: { this.state.totalProduction } tons</h2>
</div>
);
}
processRange(e) {
this.setState({
totalProduction: calculateTotalProduction(e.value)
});
}
}
const formatNumber = new Intl.NumberFormat('en-US', { minimumFractionDigits: 0 }).format;
function calculateTotalProduction(range = []) {
let startIndex = 0;
let endIndex = dataSource.length;
dataSource.forEach((item, index) => {
if (item.country == range[0]) {
startIndex = index;
}
if (item.country == range[1]) {
endIndex = index + 1;
}
});
return formatNumber(dataSource
.slice(startIndex, endIndex)
.reduce((total, item) => total + item.copper, 0));
}
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/20.2.5/css/dx.common.css" />
<link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/20.2.5/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>
#range-selector-demo {
text-align: center;
}
#range-selector {
margin-bottom: 20px;
height: 200px;
}
export const dataSource = [
{ country: 'Chile', copper: 5700000 },
{ country: 'United States', copper: 1220000 },
{ country: 'Peru', copper: 1300000 },
{ country: 'China', copper: 1650000 },
{ country: 'Australia', copper: 990000 },
{ country: 'Russia', copper: 930000 },
{ country: 'DR Congo', copper: 900000 },
{ country: 'Finland', copper: 119000 }
];
System.config({
transpiler: 'plugin-babel',
meta: {
'devextreme/localization.js': {
"esModule": true
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
defaultExtension: 'js',
map: {
'react': 'npm:react@16.14.0/umd/react.development.js',
'react-dom': 'npm:react-dom@16.14.0/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@1.25.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@20.2.5',
'devextreme-react': 'npm:devextreme-react@20.2.5',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.8/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.11/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.18/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.11/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.11/hooks/dist/hooks.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-react': {
main: 'index.js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
});