Customize Points and Labels
Documentation
This demo shows how you can customize individual points and labels in the Chart.
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.
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We appreciate your feedback.
import React from 'react';
import {
Chart,
Series,
Legend,
ValueAxis,
VisualRange,
Label,
ConstantLine,
Export
} from 'devextreme-react/chart';
import { temperaturesData } from './data.js';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
highAverage: 77,
lowAverage: 58
};
this.customizeLabel = this.customizeLabel.bind(this);
this.customizePoint = this.customizePoint.bind(this);
}
render() {
return (
<Chart
id="chart"
title="Daily Temperature in May"
dataSource={temperaturesData}
customizePoint={this.customizePoint}
customizeLabel={this.customizeLabel}
>
<Series
argumentField="day"
valueField="value"
type="bar"
color="#e7d19a"
/>
<ValueAxis maxValueMargin={0.01}>
<VisualRange startValue={40} />
<Label customizeText={this.customizeText} />
<ConstantLine
width={2}
value={this.state.lowAverage}
color="#8c8cff"
dashStyle="dash"
>
<Label text="Low Average" />
</ConstantLine>
<ConstantLine
width={2}
value={this.state.highAverage}
color="#ff7c7c"
dashStyle="dash"
>
<Label text="High Average" />
</ConstantLine>
</ValueAxis>
<Legend visible={false} />
<Export enabled={true} />
</Chart>
);
}
customizePoint(arg) {
if (arg.value > this.state.highAverage) {
return { color: '#ff7c7c', hoverStyle: { color: '#ff7c7c' } };
} else if (arg.value < this.state.lowAverage) {
return { color: '#8c8cff', hoverStyle: { color: '#8c8cff' } };
}
}
customizeLabel(arg) {
if (arg.value > this.state.highAverage) {
return {
visible: true,
backgroundColor: '#ff7c7c',
customizeText: function(e) {
return `${e.valueText }°F`;
}
};
}
}
customizeText(arg) {
return `${arg.valueText }°F`;
}
}
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/19.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.5/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>
#chart {
height: 440px;
width: 100%;
}
export const temperaturesData = [{
day: '1',
value: 57
}, {
day: '2',
value: 58
}, {
day: '3',
value: 57
}, {
day: '4',
value: 59
}, {
day: '5',
value: 63
}, {
day: '6',
value: 63
}, {
day: '7',
value: 63
}, {
day: '8',
value: 64
}, {
day: '9',
value: 64
}, {
day: '10',
value: 64
}, {
day: '11',
value: 69
}, {
day: '12',
value: 72
}, {
day: '13',
value: 75
}, {
day: '14',
value: 78
}, {
day: '15',
value: 76
}, {
day: '16',
value: 70
}, {
day: '17',
value: 65
}, {
day: '18',
value: 65
}, {
day: '19',
value: 68
}, {
day: '20',
value: 70
}, {
day: '21',
value: 73
}, {
day: '22',
value: 73
}, {
day: '23',
value: 75
}, {
day: '24',
value: 78
}, {
day: '25',
value: 76
}, {
day: '26',
value: 76
}, {
day: '27',
value: 80
}, {
day: '28',
value: 76
}, {
day: '29',
value: 75
}, {
day: '30',
value: 75
}, {
day: '31',
value: 74
}];
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',
'devexpress-diagram': 'npm:devexpress-diagram',
'devexpress-gantt': 'npm:devexpress-gantt',
// 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
}
});