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Guard against navigating away when there are unsaved changes
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| import {CanDeactivate, Router} from '@angular/router'; | |
| import {Injectable} from '@angular/core'; | |
| import {Observable} from 'rxjs/Observable'; | |
| import {Observer} from 'rxjs/Observer'; | |
| import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material'; | |
| export interface CanComponentDeactivate { | |
| canDeactivate: () => Observable<boolean> | Promise<boolean> | boolean; | |
| } | |
| @Injectable() | |
| export class UnsavedChangesGuard implements CanDeactivate<CanComponentDeactivate> { | |
| constructor(private dialog: MatDialog) {} | |
| canDeactivate(component: CanComponentDeactivate) { | |
| // Allow navigation if the component says that it is OK or it doesn't have a canDeactivate function | |
| if (!component.canDeactivate || component.canDeactivate()) { | |
| return true; | |
| } | |
| return Observable.create((observer: Observer<boolean>) => { | |
| // UnsavedChangesDialog defined somewhere else and imported above | |
| let dialogRef = this.dialog.open(UnsavedChangesDialog, { | |
| data: { | |
| message: 'You have unsaved changes. Are you sure you want to leave this page?' | |
| } | |
| }); | |
| dialogRef.afterClosed().subscribe(result => { | |
| observer.next(result); | |
| observer.complete(); | |
| }, (error) => { | |
| observer.next(false); | |
| observer.complete(); | |
| } | |
| }); | |
| }); | |
| } | |
| } |
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