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.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you for the feedback!
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Backend API
<dx-vector-map
id="vector-map"
#vectorMap
[bounds]="[-180, 85, 180, -60]"
(onZoomFactorChanged)="zoomChanged($event)"
(onCenterChanged)="centerChanged($event)"
>
<dxi-layer [dataSource]="worldMap"></dxi-layer>
<dxo-control-bar [panVisible]="pan.value" [zoomVisible]="zoom.value">
</dxo-control-bar>
</dx-vector-map>
<div class="options">
<div class="caption">Options</div>
<div class="wrapper-option">
<div class="column">
<div class="option">
<span>Continent</span>
<dx-select-box
[dataSource]="viewportData"
[width]="210"
[inputAttr]="{ 'aria-label': 'Continent' }"
displayExpr="continent"
valueExpr="coordinates"
[value]="viewportData[0].coordinates"
(onValueChanged)="onValueChanged($event)"
></dx-select-box>
</div>
<div class="option">
<span>Zoom factor</span>
<dx-text-box
[value]="zoomFactorValue"
[readOnly]="true"
[width]="210"
[inputAttr]="{ 'aria-label': 'Zoom' }"
>
</dx-text-box>
</div>
<div class="option">
<span>Center</span>
<dx-text-box
[inputAttr]="{ 'aria-label': 'Center' }"
[value]="centerValue"
[readOnly]="true"
[width]="210"
></dx-text-box>
</div>
</div>
<div class="column">
<div class="option">
<span>Pan control</span>
<dx-switch [value]="true" #pan></dx-switch>
</div>
<div class="option">
<span>Zoom bar</span>
<dx-switch [value]="true" #zoom></dx-switch>
</div>
</div>
</div>
</div>
import {
NgModule, Component, enableProdMode, ViewChild,
} from '@angular/core';
import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import {
DxVectorMapModule, DxSelectBoxModule, DxTextBoxModule, DxVectorMapComponent, DxSwitchModule,
} from 'devextreme-angular';
import * as mapsData from 'devextreme-dist/js/vectormap-data/world.js';
import { ViewportCoordinate, Service } from './app.service';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
providers: [Service],
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
preserveWhitespaces: true,
})
export class AppComponent {
worldMap: any = mapsData.world;
zoomFactorValue: string;
centerValue: string;
viewportData: ViewportCoordinate[];
panVisible: boolean;
zoomVisible: boolean;
@ViewChild(DxVectorMapComponent, { static: false }) map: DxVectorMapComponent;
constructor(service: Service) {
this.centerValue = '0.000, 46.036';
this.zoomFactorValue = '1.00';
this.viewportData = service.getCoordinates();
}
onValueChanged(e) {
this.map.instance.viewport(e.value);
}
zoomChanged(e) {
this.zoomFactorValue = e.zoomFactor.toFixed(2);
}
centerChanged(e) {
this.centerValue = `${e.center[0].toFixed(3)
}, ${e.center[1].toFixed(3)}`;
}
}
@NgModule({
imports: [
BrowserModule,
BrowserTransferStateModule,
DxVectorMapModule,
DxSelectBoxModule,
DxSwitchModule,
DxTextBoxModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #vector-map {
height: 420px;
}
::ng-deep .options {
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
margin-top: 20px;
}
::ng-deep .wrapper-option {
display: flex;
gap: 24px;
padding-top: 16px;
}
::ng-deep .column {
display: flex;
gap: 10px;
flex-direction: column;
}
::ng-deep .option {
display: flex;
align-items: center;
min-height: 34px;
}
::ng-deep .caption {
font-size: 18px;
font-weight: 500;
}
::ng-deep .option > span {
width: 140px;
}
import { Injectable } from '@angular/core';
export class ViewportCoordinate {
continent: string;
coordinates: number[] | 'null';
}
const viewportCoordinates: ViewportCoordinate[] = [{
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],
}];
@Injectable()
export class Service {
getCoordinates(): ViewportCoordinate[] {
return viewportCoordinates;
}
}
// In real applications, you should not transpile code in the browser.
// You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.exports = window.exports || {};
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
'devextreme-dist/js/vectormap-data/*': {
'esModule': true,
},
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'@angular/core': 'npm:@angular/core@12.2.17',
'@angular/platform-browser': 'npm:@angular/platform-browser@12.2.17',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.17',
'@angular/forms': 'npm:@angular/forms@12.2.17',
'@angular/common': 'npm:@angular/common@12.2.17',
'@angular/compiler': 'npm:@angular/compiler@12.2.17',
'tslib': 'npm:tslib@2.3.1/tslib.js',
'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js',
'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js',
'devextreme-dist/js/vectormap-data': 'npm:devextreme-dist@23.1.6/js/vectormap-data',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@23.1.6/cjs',
'devextreme/bundles/dx.all': 'npm:devextreme@23.1.6/bundles/dx.all.js',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.6.2/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.2',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.49',
'devextreme-angular': 'npm:devextreme-angular@23.1.6',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.4/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.4/parser-html.js',
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts',
},
'devextreme': {
defaultExtension: 'js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
'rxjs': {
defaultExtension: 'js',
},
'rxjs/operators': {
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.12/inferno/package.json',
'npm:@angular/*/package.json',
'npm:@angular/common@12.2.17/*/package.json',
'npm:rxjs@7.5.3/package.json',
'npm:rxjs@7.5.3/operators/package.json',
'npm:devextreme-angular@23.1.6/*/package.json',
'npm:devextreme-angular@23.1.6/ui/*/package.json',
'npm:devextreme-angular@23.1.6/package.json',
'npm:devexpress-diagram@2.2.2/package.json',
'npm:devexpress-gantt@4.1.49/package.json',
],
};
System.config(window.config);
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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/zone.js@0.12.0/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.13/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<script src="config.js"></script>
<script>
System.import("app").catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>