mapcomplete/Logic/QueryParameters.ts

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/**
* Wraps the query parameters into UIEventSources
*/
import {UIEventSource} from "../UI/UIEventSource";
export class QueryParameters {
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private static order: string [] = ["layout","test","z","lat","lon"];
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private static knownSources = QueryParameters.init();
private static addOrder(key){
if(this.order.indexOf(key) < 0){
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console.log("Adding order", key)
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this.order.push(key)
}
}
private static init() {
const knownSources = {}
if (window.location.search) {
const params = window.location.search.substr(1).split("&");
for (const param of params) {
const kv = param.split("=");
const key = kv[0];
QueryParameters.addOrder(key)
const v = kv[1];
const source = new UIEventSource<string>(v);
source.addCallback(() => QueryParameters.Serialize())
knownSources[key] = source;
}
}
return knownSources;
}
private static Serialize() {
const parts = []
for (const key of QueryParameters.order) {
if (QueryParameters.knownSources[key] === undefined || QueryParameters.knownSources[key].data === undefined) {
continue;
}
parts.push(encodeURIComponent(key) + "=" + encodeURIComponent(QueryParameters.knownSources[key].data))
}
history.replaceState(null, "", "?" + parts.join("&"));
}
public static GetQueryParameter(key: string): UIEventSource<string> {
if (QueryParameters.knownSources[key] !== undefined) {
return QueryParameters.knownSources[key];
}
QueryParameters.addOrder(key);
const source = new UIEventSource<string>(undefined);
QueryParameters.knownSources[key] = source;
source.addCallback(() => QueryParameters.Serialize())
return source;
}
}