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import { Injectable } from '@angular/core'; | |
import { ActivatedRoute, Router, RoutesRecognized } from '@angular/router'; | |
import { QueryParamServiceInterface } from '@app/core/query-param/query-param.interface'; | |
import { BehaviorSubject } from 'rxjs/BehaviorSubject'; | |
import { Observable } from 'rxjs/Observable'; | |
import { filter, first, map, mergeMap, pluck, share, take } from 'rxjs/operators'; | |
@Injectable() | |
export class QueryParamService { | |
private routerIsReadySubject: BehaviorSubject<boolean>; | |
private routerIsReady$: Observable<boolean>; | |
constructor(private router: Router, private activatedRoute: ActivatedRoute) { | |
this.routerIsReadySubject = new BehaviorSubject(false); | |
this.routerIsReady$ = this.routerIsReadySubject | |
.asObservable() | |
.pipe(filter((isReady: boolean) => isReady), take(1), share()); | |
const routeSub = this.router.events | |
.pipe(filter((event) => event instanceof RoutesRecognized), first()) | |
.subscribe((event) => { | |
// because this can run before router is ready which gives no query params: https://github.com/angular/angular/issues/12157 | |
this.routerIsReadySubject.next(true); | |
}); | |
} | |
public getQueryParam(queryParamKey: string): Observable<any> { | |
return this.routerIsReady$.pipe( | |
mergeMap(() => this.activatedRoute.queryParams), | |
filter((params) => { | |
return params[queryParamKey]; | |
}), | |
map((params) => JSON.parse(params[queryParamKey])) | |
); | |
} | |
public getQueryParamNullable(queryParamKey: string): Observable<any> { | |
return this.routerIsReady$.pipe( | |
mergeMap(() => this.activatedRoute.queryParams), | |
pluck(queryParamKey) | |
); | |
} | |
public setQueryParam(queryParamKey, queryParamValue) { | |
// Because queryParams is readonly | |
// because this can run before router is ready, | |
// which gives no query params even if they are set: https://github.com/angular/angular/issues/12157 | |
this.routerIsReady$.subscribe(() => { | |
this.setQueryParamsFn(queryParamKey, queryParamValue); | |
}); | |
} | |
public removeQueryParam(queryParamKey) { | |
this.routerIsReady$.subscribe(() => { | |
this.removeQueryParamsFn(queryParamKey); | |
}); | |
} | |
public clear(): void { | |
this.router.navigate([], { | |
relativeTo: this.activatedRoute, | |
queryParams: {} | |
}); | |
} | |
private removeQueryParamsFn(queryParamKey) { | |
const queryParamsClone = Object.assign({}, this.activatedRoute.snapshot.queryParams); | |
delete queryParamsClone[queryParamKey]; | |
this.router.navigate([], { | |
relativeTo: this.activatedRoute, | |
queryParams: queryParamsClone | |
}); | |
} | |
private setQueryParamsFn(queryParamKey, queryParamValue) { | |
const queryParamsClone = Object.assign({}, this.activatedRoute.snapshot.queryParams); | |
queryParamsClone[queryParamKey] = JSON.stringify(queryParamValue); | |
this.router.navigate([], { | |
relativeTo: this.activatedRoute, | |
queryParams: queryParamsClone | |
}); | |
} | |
} |
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