Angular Associando arquivos JSON com localizações geográficas

    Com o mapa Ignite UI for Angular, você pode plotar dados geográficos carregados de vários tipos de arquivo. Por exemplo, você pode carregar localizações geográficas do arquivo JavaScript Object Notation (JSON).

    Angular Binding JSON Files with Geographic Locations Example

    Data Example

    Aqui está um exemplo de dados do arquivo JSON:

    [
   { "name": "Sydney Island", "lat": -16.68972, "lon": 139.45917 },
   { "name": "Sydney Creek",  "lat": -16.3,     "lon": 128.95 },
   { "name": "Mount Sydney",  "lat": -21.39864, "lon": 121.193 },
 // ...
]

    Code Snippet

    O código a seguir carrega e vinculaIgxGeographicHighDensityScatterSeriesComponent no componente mapa a um array de objetos criados a partir de arquivos JSON carregados com localizações geográficas:

    <div className="sampleRoot" >
    <igx-geographic-map #map
        width="700px"
        height="500px"
        zoomable="true" >
    </igx-geographic-map>
  </div>

<ng-template let-series="series" let-item="item" #template>
        <div>
            <span>{{item.city}}</span>
        </div>
</ng-template>

    import { AfterViewInit, Component, TemplateRef, ViewChild } from "@angular/core";
import { MarkerType } from 'igniteui-angular-charts';
import { IgxGeographicMapComponent } from 'igniteui-angular-maps';
import { IgxGeographicSymbolSeriesComponent } from 'igniteui-angular-maps';

@Component({
  selector: "app-map-binding-geographic-json-files",
  styleUrls: ["./map-binding-geographic-json-files.component.scss"],
  templateUrl: "./map-binding-geographic-json-files.component.html"
})

export class MapBindingDataJsonPointsComponent implements AfterViewInit {

    @ViewChild ("map")
    public map: IgxGeographicMapComponent;
    @ViewChild("template")
    public tooltip: TemplateRef<object>;
    constructor() {
    }

    public ngAfterViewInit(): void {
        this.componentDidMount();
    }

    public componentDidMount() {
        // fetching JSON data with geographic locations from public folder
        fetch("assets/Data/WorldCities.json")
            .then((response) => response.json())
            .then((data) => this.onDataLoaded(data));
    }

    public onDataLoaded(jsonData: any[]) {
        const geoLocations: any[] = [];
        // parsing JSON data and using only cities that are capitals
        for (const jsonItem of jsonData) {
            if (jsonItem.cap) {
                const location = {
                    city: jsonItem.name,
                    country: jsonItem.country,
                    latitude: jsonItem.lat,
                    longitude: jsonItem.lon,
                    population: jsonItem.pop
                };
                geoLocations.push(location);
            }
        }

        // creating symbol series with loaded data
        const geoSeries = new IgxGeographicSymbolSeriesComponent();
        geoSeries.dataSource = geoLocations;
        geoSeries.markerType = MarkerType.Circle;
        geoSeries.latitudeMemberPath  = "latitude";
        geoSeries.longitudeMemberPath = "longitude";
        geoSeries.markerBrush = "LightGray";
        geoSeries.markerOutline = "Black";
        geoSeries.tooltipTemplate = this.tooltip;

        // adding symbol series to the geographic amp
        this.map.series.add(geoSeries);
    }
}

    API References