Dynamic Viewport

This demo illustrates how to change the map's viewport. Use the drop-down menu under the map to choose a continent and change the visible area so that the chosen continent is displayed optimally.

To implement this functionality, call the viewport(viewportCoordinates) method every time the drop-down box value changes. You can also implement the onCenterChanged and onZoomFactorChanged functions to display the map center's coordinates and the current zoom factor in text boxes under the map.

To show or hide the control bar, enable or disable the panVisible and zoomVisible properties. You can toggle switches under the map to see how these settings affect the control bar.

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Backend API

import React from 'react'; import VectorMap, { Layer, ControlBar, } 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 Switch from 'devextreme-react/switch'; import { viewportCoordinates, centerLabel, zoomLabel, continentLabel, } 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', panVisible: true, zoomVisible: true, }; 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, }); }; this.panVisibleChange = (value) => { this.setState({ panVisible: value, }); }; this.zoomVisibleChange = (value) => { this.setState({ zoomVisible: value, }); }; } render() { return ( <div> <VectorMap id="vector-map" bounds={bounds} ref={this.storeMapInstance} onZoomFactorChanged={this.zoomFactorChanged} onCenterChanged={this.centerChanged}> <ControlBar zoomVisible={this.state.zoomVisible} panVisible={this.state.panVisible} /> <Layer dataSource={mapsData.world} /> </VectorMap> <div className="options"> <div className="caption">Options</div> <div className="wrapper-option"> <div className="column"> <div className="option"> <span>Continent</span> <SelectBox dataSource={viewportCoordinates} displayExpr="continent" valueExpr="coordinates" inputAttr={continentLabel} value={this.state.coordinates} onValueChanged={this.continentChanged} width={210} /> </div> <div className="option"> <span>Zoom factor</span> <TextBox value={this.state.zoomFactor} inputAttr={zoomLabel} readOnly={true} width={210} /> </div> <div className="option"> <span>Center</span> <TextBox value={this.state.center} readOnly={true} inputAttr={centerLabel} width={210} /> </div> </div> <div className="column"> <div className="option"> <span>Pan control</span> <Switch value={this.state.panVisible} onValueChange={this.panVisibleChange} /> </div> <div className="option"> <span>Zoom bar</span> <Switch value={this.state.zoomVisible} onValueChange={this.zoomVisibleChange} /> </div> </div> </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/23.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.6.12/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; } .wrapper-option { display: flex; gap: 24px; padding-top: 16px; } .column { display: flex; gap: 10px; flex-direction: column; } .option { display: flex; align-items: center; min-height: 34px; } .caption { font-size: 18px; font-weight: 500; } .option > span { width: 140px; }

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], }]; export const centerLabel = { 'aria-label': 'Center' }; export const zoomLabel = { 'aria-label': 'Zoom' }; export const continentLabel = { 'aria-label': 'Continent' };