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