mapcomplete/Logic/FeatureSource/LocalStorageSource.ts

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import FeatureSource from "./FeatureSource";
import {UIEventSource} from "../UIEventSource";
import LocalStorageSaver from "./LocalStorageSaver";
import LayoutConfig from "../../Customizations/JSON/LayoutConfig";
export default class LocalStorageSource implements FeatureSource {
public features: UIEventSource<{ feature: any; freshness: Date }[]>;
constructor(layout: UIEventSource<LayoutConfig>) {
this.features = new UIEventSource<{ feature: any; freshness: Date }[]>([])
const key = LocalStorageSaver.storageKey + layout.data.id
layout.addCallbackAndRun(_ => {
try {
const fromStorage = localStorage.getItem(key);
if (fromStorage == null) {
return;
}
const loaded = JSON.parse(fromStorage);
this.features.setData(loaded);
console.log("Loaded ", loaded.length, " features from localstorage as cache")
} catch (e) {
console.log("Could not load features from localStorage:", e)
localStorage.removeItem(key)
}
})
}
}