How to return observable of string

Question

Have an api method that returns a simple string. I am implementing a method in my angular service that needs to return an obserable

The simple string doesnt map directly into the observable. How can I return an observable with the simple string result from the api?

public setLineItemListApproval(lines : OrderLinesModel) : Observable<string>{

    let actionUrl = this.apiBaseURL + '/mycontroller/actionmethod1';
    const httpOptions = {
        headers: new HttpHeaders({
            'Content-Type':  'application/json'
        })
    };

    return this.httpClient.post<string>(actionUrl, lines, httpOptions).pipe(catchError(this.handleError));

}

Answer 1

You need to

• Include responseType: 'text in the options argument
• Inline the options with the call
• Use the non-generic overload of post as responseType: 'text' option now dictates which one is used as well as the return type in the Observable response

public setLineItemListApproval(lines : OrderLinesModel) : Observable<string>{

    let actionUrl = this.apiBaseURL + '/mycontroller/actionmethod1';
    return this.httpClient.post(actionUrl, lines, {
        headers: new HttpHeaders({
            'Content-Type':  'application/json'
        }),
        responseType: 'text'
    }).pipe(catchError(this.handleError));

}