John' John' - 9 months ago 73
TypeScript Question

Using openlayer3 in typescript/angular2

I have a Javascript code which use openLayer3. I need to implement this code in a angular2 project, in Typescript.

Someone knows how use openlayer with angular2 / Typescript please ?

Thanks a lot,

John

Answer Source

1. Option A (Working with the Angular CLI)

Add Openlayers3 in your .angular-cli.json (located at your project root):

...
"styles": [
  "../node_modules/openlayers/dist/ol.css"
],
"scripts": [
  "../node_modules/openlayers/dist/ol.js"
],
...

1. Option B (Not working with the Angular CLI)

Add Openlayers3 in your index.html (the "usual" way):

<script src="node_modules/openlayers/dist/ol.js"></script> <link rel="stylesheet" href="node_modules/openlayers/dist/ol.css">

2. Access ol from your typescript file:

import { AfterViewInit, Component, ElementRef, ViewChild } from "@angular/core";

// This is necessary to access ol3!
declare var ol: any;

@Component({
    selector: 'my-app',
    template: `
    <h3> The map </h3>
    <div #mapElement id="map" class="map"> </div> 
    `
    // The "#" (template reference variable) matters to access the map element with the ViewChild decorator!
})

export class AppComponent implements AfterViewInit {
    // This is necessary to access the html element to set the map target (after view init)!
    @ViewChild("mapElement") mapElement: ElementRef;

    public map: any;

    constructor(){
        var osm_layer: any = new ol.layer.Tile({
            source: new ol.source.OSM()
        });

        // note that the target cannot be set here!
        this.map = new ol.Map({
            layers: [osm_layer],
            view: new ol.View({
            center: ol.proj.transform([0,0], 'EPSG:4326', 'EPSG:3857'),
            zoom: 2
            })
        });
    }

    // After view init the map target can be set!
    ngAfterViewInit() {
        this.map.setTarget(this.mapElement.nativeElement.id);
    }
}
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