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Angular Binding JSON Files with Geographic Locations

With the Ignite UI for Angular map, you can plot geographic data loaded from various file types. For example, you can load geographic locations from JavaScript Object Notation (JSON) file.

Angular Binding JSON Files with Geographic Locations Example

Data Example

Here is an example of data from JSON file:

[
   { "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

The following code loads and binds GeographicHighDensityScatterSeries in the map component to an array of objects created from loaded JSON file with geographic locations:

<div class="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);
    }
}

Angular Binding JSON Files with Geographic Locations

Angular Binding JSON Files with Geographic Locations Example

Data Example

Code Snippet

API References