mapcomplete/Logic/QueryParameters.ts
2020-07-31 17:11:44 +02:00

73 lines
No EOL
2.3 KiB
TypeScript

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