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React Vector Map - 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 give you the ability to edit code on the fly, the demo uses SystemJS. For this reason, launching the demo takes some time. We strongly recommend that you do not use this approach in real projects.
Was this demo helpful?
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Backend API
x
import React, { useCallback, useRef, useState } from 'react';
import VectorMap, { Layer, ControlBar, VectorMapTypes } 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.ts';
const bounds = [-180, 85, 180, -60];
const App = () => {
const [coordinates, setCoordinates] = useState(viewportCoordinates[0].coordinates);
const [zoomFactor, setZoomFactor] = useState('1.00');
const [center, setCenter] = useState('0.000, 46.036');
const [panVisible, setPanVisible] = useState(true);
const [zoomVisible, setZoomVisible] = useState(true);
const mapRef = useRef(null);
const continentChanged = useCallback(({ value }) => {
setCoordinates(value);
mapRef.current.instance().viewport(value);
}, [setCoordinates]);
const zoomFactorChanged = useCallback((e: VectorMapTypes.ZoomFactorChangedEvent) => {
setZoomFactor(e.zoomFactor.toFixed(2));
}, [setZoomFactor]);
const centerChanged = useCallback((e: VectorMapTypes.CenterChangedEvent) => {
const value = `${e.center[0].toFixed(3)}, ${e.center[1].toFixed(3)}`;
setCenter(value);
}, [setCenter]);
const panVisibleChange = useCallback((value) => {
setPanVisible(value);
}, [setPanVisible]);
const zoomVisibleChange = useCallback((value) => {
setZoomVisible(value);
}, [setZoomVisible]);
return (
<div>
<VectorMap
id="vector-map"
bounds={bounds}
ref={mapRef}
onZoomFactorChanged={zoomFactorChanged}
onCenterChanged={centerChanged}
>
<ControlBar zoomVisible={zoomVisible} panVisible={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={coordinates}
onValueChanged={continentChanged}
width={210}
/>
</div>
<div className="option">
<span>Zoom factor</span>
<TextBox
value={zoomFactor}
inputAttr={zoomLabel}
readOnly={true}
width={210}
/>
</div>
<div className="option">
<span>Center</span>
<TextBox
value={center}
readOnly={true}
inputAttr={centerLabel}
width={210}
/>
</div>
</div>
<div className="column">
<div className="option">
<span>Pan control</span>
<Switch
value={panVisible}
onValueChange={panVisibleChange}
/>
</div>
<div className="option">
<span>Zoom bar</span>
<Switch
value={zoomVisible}
onValueChange={zoomVisibleChange}
/>
</div>
</div>
</div>
</div>
</div>
);
};
export default App;
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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.