Utilizing Async and await for transferring data between components

I currently have 2 components and 1 service file. The **Component** is where I need the response to be displayed. My goal is to call a function from the Master component in Component 1 and receive the response back in the Master component.

My concern lies in figuring out how to pass the same API response from the Master component to Component 1 using async/await. Any assistance would be greatly appreciated!

Component.ts

        async fetchData() {
            const result = await this.Mastercomponent.getData();
            console.log(result, ": result of function");

Mastercomponent.ts

        async getData() {
            this.service.fetchData(object).subscribe(
                data => { 
                    console.log(data, "Received Response in Mastercomponent");
                    return data;
                }
            );
        }

Service.ts

         return this.http.post(parameters, { headers: header, responseType: 'text' }).pipe(
              tap(data => {
                    console.log(data, "Received Response in Service");
              }),
              catchError(this.handleError)
            );

Answer №1

async functions typically return promises, however the main function in your master component does not explicitly have a return statement, resulting in a promise of undefined. The only instance of a return is within a callback that is unrelated to the asynchronous function's return value.

There are various approaches to resolve this issue, and here is just one suggestion:

function( ) {
    return this.service._getdata(ob).toPromise().then(data => {
//  ^^^^^^                           ^^^^^^^^^^^^^^^^ 
        console.log(data, "Response Received in Mastercomponent");
        return data;
    });
}

It is important to note that the async keyword is not necessary in this scenario since you are already returning a promise and not utilizing await. In general, functions without await do not require the async keyword (although including it will not cause any issues).

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