mapcomplete/Logic/Web/QueryParameters.ts

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