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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | 1x 1x 1x 1x 167x 167x 167x 20686x 5168x 2x 5166x 7x 7x 40x | import { Injectable } from '@angular/core';
import { NavigationStart, Router } from '@angular/router';
import { Observable, Subject } from 'rxjs';
/**
* Alert Service
*/
@Injectable()
export class AlertService {
/** collection of messages */
private readonly subject = new Subject<any>();
/** do you want to keep message as shown even after gone to another page? */
private keepAfterNavigationChange = false;
/**
* constructor of AlertService
* @param router: Router
*/
constructor(router: Router) {
// clear alert message on route change
router.events.subscribe(event => {
if (event instanceof NavigationStart) {
if (this.keepAfterNavigationChange) {
// only keep for a single location change
this.keepAfterNavigationChange = false;
} else {
// clear alert
this.subject.next();
}
}
});
}
/**
* Show message to user
* @param message: message text
* @param keepAfterNavigationChange: do you want to keep message as shown even after gone to another page?
*/
success(message: string, keepAfterNavigationChange = false): void {
this.keepAfterNavigationChange = keepAfterNavigationChange;
this.subject.next({type: 'success', text: message});
}
// istanbul ignore next
/**
* Show error to user
* @param message: error text
* @param keepAfterNavigationChange: do you want to keep message as shown even after gone to another page?
*/
error(message: string, keepAfterNavigationChange = false): void {
this.keepAfterNavigationChange = keepAfterNavigationChange;
this.subject.next({type: 'error', text: message});
}
/**
* get current messages
*/
getMessage(): Observable<any> {
return this.subject.asObservable();
}
}
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