mapcomplete/Logic/Web/LocalStorageSource.ts

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import {UIEventSource} from "../UIEventSource";
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/**
* UIEventsource-wrapper around localStorage
*/
export class LocalStorageSource {
static Get(key: string, defaultValue: string = undefined): UIEventSource<string> {
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try {
const saved = localStorage.getItem(key);
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const source = new UIEventSource<string>(saved ?? defaultValue, "localstorage:"+key);
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source.addCallback((data) => {
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try{
localStorage.setItem(key, data);
}catch(e){
// Probably exceeded the quota with this item!
// Lets nuke everything
localStorage.clear()
}
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});
return source;
} catch (e) {
return new UIEventSource<string>(defaultValue);
}
}
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}