mapcomplete/Logic/FeatureSource/GeoJsonSource.ts

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import FeatureSource from "./FeatureSource";
import {UIEventSource} from "../UIEventSource";
import * as $ from "jquery";
import {Layer} from "leaflet";
/**
* Fetches a geojson file somewhere and passes it along
*/
export default class GeoJsonSource implements FeatureSource {
features: UIEventSource<{ feature: any; freshness: Date }[]>;
constructor(layerId: string, url: string, onFail: ((errorMsg: any) => void) = undefined) {
if (onFail === undefined) {
onFail = errorMsg => {
console.warn(`Could not load geojson layer from`, url, "due to", errorMsg)
}
}
this.features = new UIEventSource<{ feature: any; freshness: Date }[]>(undefined)
const eventSource = this.features;
$.getJSON(url, function (json, status) {
if (status !== "success") {
console.log("Fetching geojson failed failed")
onFail(status);
return;
}
if (json.elements === [] && json.remarks.indexOf("runtime error") > 0) {
console.log("Timeout or other runtime error");
onFail("Runtime error (timeout)")
return;
}
const time = new Date();
const features: { feature: any, freshness: Date } [] = []
let i = 0;
for (const feature of json.features) {
if (feature.properties.id === undefined) {
feature.properties.id = url + "/" + i;
feature.id = url + "/" + i;
i++;
}
feature._matching_layer_id = layerId;
features.push({feature: feature, freshness: time})
}
console.log("Loaded features are", features)
eventSource.setData(features)
}).fail(onFail)
}
}