我们如何获得Helper类对组件的响应并在angular 7中与HTML绑定？

Question

In below is the AppointmentHelper class I have created

export class AppointmentHelper {

public static bindAssessements(servicedata: any,
    appointmentService: AppointmentService,
    serviceDeliveryGuid: string): any {
    appointmentService.getAssessments(serviceDeliveryGuid)
      .subscribe((response: any) => {
        if (response && response.data) {
            this.servicedata = response.data
        }
    }, () => {
      // Error Block
    });
  }
}

In my main component i am trying to call helper class like the below

ngOnInit() {   
  servicedata :any;
    this.serviceDeliveryGuid = '13c22f96-163e-40cf-b13a-e6832154d985';
    AppointmentHelper.bindAssessements(this.servicedata, this.appointmentService, this.serviceDeliveryGuid);
  }

But i am unable to get the data from helper class.

So could you please suggest me how we can get response from Helper class to component and bind with HTML in angular 7?

Answer 1

You have a mistype in:

public static bindAssessements(servicedata: any,
    appointmentService: AppointmentService,
    serviceDeliveryGuid: string): any {
    appointmentService.getAssessments(serviceDeliveryGuid)
      .subscribe((response: any) => {
        if (response && response.data) {
            // here should be servicedata = response.data
            this.servicedata = response.data
        }
    }, () => {
      // Error Block
    });
  }
}

also

ngOnInit() {   
  servicedata :any; // why? you also using this.servicedata in function call
  ...
}

have you linked servicedata in template?

<span>{{ servicedata }}</span>