Dynamic Viewport
Documentation
This demo illustrates how to change the map’s viewport from code. Choose a continent using the drop-down menu under the map. In response to that, the map changes the visible area so that the chosen continent is displayed optimally. This is performed in code by calling the viewport(viewportCoordinates) method. After that, callback functions assigned to the centerChanged and zoomFactorChanged options are triggered. These functions place the current values of the map’s center and zoom factor in the text boxes under the map.
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import React from 'react';
import VectorMap, {
Layer
} from 'devextreme-react/vector-map';
import TextBox from 'devextreme-react/text-box';
import SelectBox from 'devextreme-react/select-box';
import * as mapsData from 'devextreme/dist/js/vectormap-data/world.js';
import { viewportCoordinates } from './data.js';
const bounds = [-180, 85, 180, -60];
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
coordinates: viewportCoordinates[0].coordinates,
zoomFactor: '1.00',
center: '0.000, 46.036'
};
this.storeMapInstance = (component) =>{
this.map = component.instance;
};
this.continentChanged = ({ value }) => {
this.setState({
coordinates: value
});
this.map.viewport(value);
};
this.zoomFactorChanged = ({ zoomFactor }) => {
this.setState({
zoomFactor: zoomFactor.toFixed(2)
});
};
this.centerChanged = ({ center }) => {
const value = `${center[0].toFixed(3)}, ${center[1].toFixed(3)}`;
this.setState({
center: value
});
};
}
render() {
return (
<div>
<VectorMap
id="vector-map"
bounds={bounds}
ref={this.storeMapInstance}
onZoomFactorChanged={this.zoomFactorChanged}
onCenterChanged={this.centerChanged}>
<Layer dataSource={mapsData.world} />
</VectorMap>
<div className="options">
<div className="caption">Options</div>
<div className="option">
<span>Continent</span>
<SelectBox
dataSource={viewportCoordinates}
displayExpr="continent"
valueExpr="coordinates"
value={this.state.coordinates}
onValueChanged={this.continentChanged}
/>
</div>
<div className="option">
<span>Zoom factor</span>
<TextBox
value={this.state.zoomFactor}
readOnly={true}
/>
</div>
<div className="option">
<span>Center</span>
<TextBox
value={this.state.center}
readOnly={true}
/>
</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/20.1.6/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.6/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>
#vector-map {
height: 420px;
}
.options {
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
margin-top: 20px;
}
.option {
margin-top: 10px;
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option > span {
width: 140px;
display: inline-block;
}
.option > .dx-widget {
display: inline-block;
vertical-align: middle;
width: 210px;
}
export const viewportCoordinates = [{
'continent': 'all',
'coordinates': 'null'
}, {
'continent': 'NorthAmerica',
'coordinates': [-180, 84.52, -22.11, -1.57]
}, {
'continent': 'SouthAmerica',
'coordinates': [-112.47, 14.26, -27.52, -57.44]
}, {
'continent': 'Africa',
'coordinates': [-29.34, 39.09, 55.60, -39.00]
}, {
'continent': 'Europe',
'coordinates': [-2.35, 70.91, 61.35, 35.84]
}, {
'continent': 'Asia',
'coordinates': [27.62, 83.11, 180, -19.36]
}, {
'continent': 'Australia',
'coordinates': [104.87, -6.61, 149.98, -45.87]
}];
System.config({
transpiler: 'plugin-babel',
meta: {
'devextreme/dist/js/vectormap-data/*': {
'esModule': true
},
},
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/dist/js/vectormap-data': 'npm:devextreme@20.1/dist/js/vectormap-data',
'devextreme': 'npm:devextreme@20.1',
'devextreme-react': 'npm:devextreme-react@20.1',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram@1.0.9',
'devexpress-gantt': 'npm:devexpress-gantt@1.0.7',
// 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'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
},
babelOptions: {
sourceMaps: false,
stage0: true,
react: true
}
});