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

<template> <div> <DxVectorMap id="vector-map" ref="map" :bounds="bounds" @center-changed="centerChanged" @zoom-factor-changed="zoomFactorChanged" > <DxLayer :data-source="world" /> <DxControlBar v-model:pan-visible="panVisible" v-model:zoom-visible="zoomVisible" /> </DxVectorMap> <div class="options"> <div class="caption">Options</div> <div className="wrapper-option"> <div className="column"> <div class="option"> <span>Continent </span> <SelectBox :data-source="viewportCoordinates" :value="viewportCoordinates[0].coordinates" :on-value-changed="continentChanged" :input-attr="{ 'aria-label': 'Continent' }" value-expr="coordinates" display-expr="continent" :width="210" /> </div> <div class="option"> <span>Zoom factor </span> <TextBox :value="zoomFactor" :input-attr="{ 'aria-label': 'Zoom' }" :read-only="true" :width="210" /> </div> <div class="option"> <span>Center </span> <TextBox :value="center" :input-attr="{ 'aria-label': 'Center' }" :read-only="true" :width="210" /> </div> </div> <div className="column"> <div class="option"> <span>Pan control</span> <Switch v-model:value="panVisible"/> </div> <div class="option"> <span>Zoom bar</span> <Switch v-model:value="zoomVisible"/> </div> </div> </div> </div> </div> </template> <script> import { DxVectorMap, DxLayer, DxControlBar, } from 'devextreme-vue/vector-map'; import TextBox from 'devextreme-vue/text-box'; import SelectBox from 'devextreme-vue/select-box'; import Switch from 'devextreme-vue/switch'; import * as mapsData from 'devextreme-dist/js/vectormap-data/world.js'; import { viewportCoordinates } from './data.js'; export default { components: { DxVectorMap, DxLayer, TextBox, SelectBox, Switch, DxControlBar, }, data() { return { viewportCoordinates, world: mapsData.world, bounds: [-180, 85, 180, -60], center: '0.000, 46.036', zoomFactor: '1.00', panVisible: true, zoomVisible: true, }; }, methods: { continentChanged({ value }) { this.$refs.map.instance.viewport(value); }, centerChanged({ center }) { this.center = `${center[0].toFixed(3)}, ${center[1].toFixed(3)}`; }, zoomFactorChanged({ zoomFactor }) { this.zoomFactor = zoomFactor.toFixed(2); }, }, }; </script> <style> #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; } </style>

import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#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" /> <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>

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], }];