Navigation triggered outside Angular zone, did you forget to call 'ngZone.run()'?

Question

I am using Angular 7 and facing an issue => after login the API GET calls successfully and the component receiving data too, but UI is not displaying that data.

When I open the browser console, immediately the data gets populated on the UI and a warning is showing in the console.

"core.js:15686 Navigation triggered outside Angular zone, did you forget to call 'ngZone.run()'?"

I have googled this warning and found some workaround like this.ngZone.run() and call my API's inside it.

But the issue is, I am using more than 40 components and calling so many API in each component. So I have to call ngZone.run() on each API call, which seems to be difficult to do.

Please suggest me the better approach to overcome this issue. Thanks in advance.

app.component.ts

getEmployees(): void {
    this.employeeService.getEmployees().subscribe(e => {
        this.employees = e;
    });
}

app.service.ts

@Injectable()
export class EmployeeService {
    constructor(private httpClient: HttpClient) { }

    getEmployees() {
        return this.httpClient.get<EmployeeModel[]>('employees');
    }

Answer 1

Usually this happens when you are wrapping angular calls inside some external js callback, from external JavaScript not related to angular code.

Example app.component.ts:

callMyCustomJsLibrary() {
  googleSdk.getLocations(location => this.getEmployees());
}

getEmployees(): void {
    this.employeeService.getEmployees().subscribe(e => {
        this.employees = e;
    });
}

In this case you will have to include the call into the NgZone, example: this.ngZone.run(() => this.getEmployees());

The app.component.ts would then look like the following:

callMyCustomJsLibrary() {
  googleSdk.getLocations(location => this.ngZone.run(() => this.getEmployees()));
}

getEmployees(): void {
    this.employeeService.getEmployees().subscribe(e => {
        this.employees = e;
    });
}