Update Linear Gauge Data at Runtime
Documentation
This demo illustrates data binding in the LinearGauge widget. The bound data changes when a user selects a new location in the City drop-down menu.
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import React from 'react';
import { LinearGauge, Title, Font, Geometry, Scale, RangeContainer, Range, ValueIndicator, Label } from 'devextreme-react/linear-gauge';
import { SelectBox } from 'devextreme-react/select-box';
import { cities } from './data.js';
const customTicks = [900, 1000, 1020, 1100];
const pressureLabelFormat = {
type: 'decimal'
};
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
selectBoxValue: cities[0].data,
temperature: cities[0].data.temperature,
humidity: cities[0].data.humidity,
pressure: cities[0].data.pressure
};
this.onSelectionChanged = (e) => {
var weatherData = e.selectedItem.data;
this.setState({
selectBoxValue: weatherData,
temperature: weatherData.temperature,
humidity: weatherData.humidity,
pressure: weatherData.pressure
});
};
}
render() {
const temperatureGaugeStartValue = -40;
return (
<div>
<div className="long-title">
<h3>Weather Indicators</h3>
</div>
<div id="gauge-demo">
<LinearGauge
className="gauge-element"
value={this.state.temperature}
>
<Title text="Temperature (°C)">
<Font size={16} />
</Title>
<Geometry orientation="vertical" />
<Scale startValue={temperatureGaugeStartValue} endValue={40} tickInterval={40} />
<RangeContainer backgroundColor="none">
<Range startValue={temperatureGaugeStartValue} endValue={0} color="#679EC5" />
<Range startValue={0} endValue={40} />
</RangeContainer>
</LinearGauge>
<LinearGauge
className="gauge-element"
value={this.state.humidity}
>
<Title text="Humidity (%)">
<Font size={16} />
</Title>
<Geometry orientation="vertical" />
<Scale startValue={0} endValue={100} tickInterval={10} />
<RangeContainer backgroundColor="#CACACA" />
<ValueIndicator type="rhombus" color="#A4DDED" />
</LinearGauge>
<LinearGauge
className="gauge-element"
value={this.state.pressure}
>
<Title text="Barometric Pressure (mb)">
<Font size={16} />
</Title>
<Geometry orientation="vertical" />
<Scale startValue={900} endValue={1100} customTicks={customTicks}>
<Label format={pressureLabelFormat} />
</Scale>
<RangeContainer>
<Range startValue={900} endValue={1000} color="#679EC5" />
<Range startValue={1000} endValue={1020} color="#A6C567" />
<Range startValue={1020} endValue={1100} color="#E18E92" />
</RangeContainer>
<ValueIndicator type="circle" color="#E3A857" />
</LinearGauge>
</div>
<SelectBox
dataSource={cities}
valueExpr="data"
value={this.state.selectBoxValue}
displayExpr="name"
onSelectionChanged={this.onSelectionChanged}
/>
</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/19.2.4/css/dx.common.css" />
<link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/19.2.4/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>
#gauge-demo {
width: 90%;
margin: 0 auto
}
#gauge-demo .gauge-element {
height: 400px;
width: 33%;
float: left;
}
.dx-selectbox {
margin: 10px auto 0;
width: 200px;
}
#gauge-demo::after{
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
.long-title h3 {
font-weight: 200;
font-size: 28px;
text-align: center;
margin-bottom: 20px;
}
export const cities = [{
name: 'London',
id: '1',
data: {
temperature: 10,
humidity: 81,
pressure: 1002.1
}
}, {
name: 'Berlin',
id: '2',
data: {
temperature: 14,
humidity: 58,
pressure: 1008.5
}
}, {
name: 'New York',
id: '3',
data: {
temperature: 3,
humidity: 89,
pressure: 1016.2
}
}, {
name: 'Moscow',
id: '4',
data: {
temperature: 2,
humidity: 51,
pressure: 1016.5
}
}, {
name: 'Bangkok',
id: '5',
data: {
temperature: 37,
humidity: 39,
pressure: 1007.0
}
}];
System.config({
transpiler: 'plugin-babel',
paths: {
'npm:': 'https://unpkg.com/'
},
defaultExtension: 'js',
map: {
'react': 'npm:react@16/umd/react.development.js',
'react-dom': 'npm:react-dom@16/umd/react-dom.development.js',
'prop-types': 'npm:prop-types/prop-types.js',
'devextreme': 'npm:devextreme@19.2',
'devextreme-react': 'npm:devextreme-react@19.2',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
// SystemJS plugins
'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js',
'systemjs-babel-build':
'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js'
},
packages: {
'devextreme': {
defaultExtension: 'js'
},
'devextreme-react': {
main: 'index.js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
});