Update Bar Gauge Data at Runtime
Documentation
This demo illustrates how to bind an array of values to the BarGauge. Since an array can not be bound to a field as a regular value, it is bound as a computed one.
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import React from 'react';
import { BarGauge, Label } from 'devextreme-react/bar-gauge';
import { SelectBox } from 'devextreme-react/select-box';
import { colors } from './data.js';
const palette = ['#ff0000', '#00ff00', '#0000ff'];
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
basis: this.getBasicColors(colors[0].code),
currentColor: colors[0].code
};
this.onSelectionChanged = ({ selectedItem: { code } }) => {
this.setState({
currentColor: code,
basis: this.getBasicColors(code)
});
};
}
render() {
return (
<div>
<div className={'long-title'}>
<h3>Colors Representation via Basic Colors</h3>
</div>
<div id={'gauge-demo'}>
<BarGauge
id={'gauge'}
startValue={0}
endValue={255}
palette={palette}
values={this.state.basis}
>
<Label visible={false} />
</BarGauge>
<div className={'action-container'}>
<SelectBox
id={'select-color'}
width={150}
dataSource={colors}
value={this.state.currentColor}
displayExpr={'name'}
valueExpr={'code'}
onSelectionChanged={this.onSelectionChanged}
/>
<div className={'color-box'}
style={{ backgroundColor: this.state.currentColor }}
></div>
</div>
</div>
</div>
);
}
getBasicColors(value) {
var code = Number(`0x${ value.slice(1)}`);
return [
(code >> 16) & 0xff,
(code >> 8) & 0xff,
code & 0xff
];
}
}
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/19.1.7/css/dx.common.css" />
<link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/19.1.7/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 {
height: 440px;
width: 100%;
}
#gauge {
width: 80%;
height: 100%;
margin-top: 20px;
float: left;
}
.action-container {
width: 20%;
text-align: left;
margin-top: 20px;
float: left;
}
.color-box {
width: 40px;
height: 40px;
margin-top: 20px;
}
.long-title h3 {
font-weight: 200;
font-size: 28px;
text-align: center;
margin-bottom: 20px;
}
export const colors = [{
name: 'Amaranth',
code: '#e52b50'
}, {
name: 'Amethyst',
code: '#9966cc'
}, {
name: 'Ash grey',
code: '#b2beb5'
}, {
name: 'Barn red',
code: '#7c0a02'
}, {
name: 'Imperial',
code: '#602f6b'
}, {
name: 'Lemon lime',
code: '#e3ff00'
}, {
name: 'Mountain Meadow',
code: '#30ba8f'
}, {
name: 'Outer Space',
code: '#414a4c'
}, {
name: 'Persian plum',
code: '#701c1c'
}, {
name: 'Seal brown',
code: '#321414'
}, {
name: 'Twilight lavender',
code: '#8a496b'
}, {
name: 'Umber',
code: '#635147'
}];
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@19.1',
'devextreme-react': 'npm:devextreme-react@19.1',
'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
}
});