Tips for handling user click events in Angular 2?

In Angular2, I am facing an issue with two components. When a user clicks a button in component1, a method is triggered that stores data in the shared service to a variable. However, component2's ngOnInit() method initializes this variable to undefined because it doesn't wait for the click event.

So, my question is: how can I make Angular2 component2 wait for the click event in component1?

Usually in JavaScript, we would use click event listeners or callback functions to achieve this, but I am unsure of how to implement the same concept in Angular.

I would appreciate any ideas or suggestions on how to approach this problem.

angulartypescriptangular2-formsangular2-services

Answer №1

Yes, this solution should do the trick!

DepartmentService:

private dataStream = new Subject<any>();
dataStream$ = this.dataStream.asObservable();

receiveData(data) {
  //emit value
  this.dataStream.next(data)
}

In your parent component, set the value in the service like this:

_setDataValue(dataObject) {
   this.departmentsService.receiveData(dataObject);
}

In the child component constructor, subscribe to the data stream:

constructor( 
  private dataService: DataService, 
  private departmentService: DepartmentsService 
) { 
     dataService.dataStream$.subscribe(dataObject => {
        console.log(dataObject); // you will see the value here
     })
  }

You can also check out this official documentation link for more details on bidirectional service communication.

I hope this explanation proves helpful!

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