Angular2 - pass ASYNC data to a child component

Question

I have a problem with passing asynchronous data to a child component. I am trying to write a dynamic form generator. The problem starts when I try to call json via Observable and pass it to a child component.

service:

generateSearchFields2(): Observable<any> {
        return this.http
            .get(this.API + 'searchFields')
            .map((res:Response) => {
                res.json().data as any;
                for (var i = 0; i < res.json().data.length; i++) {
                    var searchField = res.json().data[i];
                    switch (searchField.component) {
                        case "TextboxQuestion": 

                            let TXQ: TextboxQuestion = new TextboxQuestion({
                                key: searchField.key,
                                label: searchField.label,
                                value: searchField.value,
                                required: searchField.required,
                                order: searchField.order
                            });
                            this.searchFieldModels.push(TXQ);
                            console.log("TXQ: ", TXQ, this.searchFieldModels);
                            break;
                        case "DropdownQuestion": 

                            let DDQ: DropdownQuestion = new DropdownQuestion({
                                key: searchField.key,
                                label: searchField.label,
                                required: searchField.required,
                                options: searchField.options,
                                order: searchField.order
                            });
                            this.searchFieldModels.push(DDQ);
                            console.log("TXQ: ", DDQ, this.searchFieldModels);
                            break;
                        default:
                            alert("DEFAULT");
                            break;
                    }
                }
                return this.searchFieldModels.sort((a, b) => a.order - b.order);
            })
            .catch(this.handleError);
    }

Component Parent:

generateSearchFields2() {
    this.service.generateSearchFields2()
      .subscribe(res => this.searchFields = res)
  }

Passing the Iam variable through the INPUT directive in the parent template for the child: [searchFields]="searchFields"

The problem is in the child component, where searchFieldit is undefined. In this child, I pass the value to another service to create formContros, but I also got undefined. Missing data here begins with a child:

@Input() searchFields: SearchBase<any>[] = [];

ngOnInit() {   
    this.form = this.qcs.toFormGroup(this.searchFields);
    console.log("ONINIT DYNAMIC FORM COMPONENT: ", this.searchFields);

  }

Please tell me how can I pass the async variable so as not to lose data in a period of time

Answer 1

@Input() searchFields

private _searchFields: SearchBase<any>[] = [];
@Input() set searchFields(value SearchBase<any>[]) {
  if(value != null) {
    this.form = this.qcs.toFormGroup(this.searchFields);
    console.log("ONINIT DYNAMIC FORM COMPONENT: ", this.searchFields);
  }
}

get searchFields() : SearchBase<any>[] {
  return this.searchFields;
}

ngOnChanges(), , , , , .

Answer 2

ngOnInit data, parent, . , searchFields undefined. NgAfterViewInit.

@Input() searchFields: SearchBase<any>[] = [];

ngAfterViewInit() {   
    this.form = this.qcs.toFormGroup(this.searchFields);
    console.log("ONINIT DYNAMIC FORM COMPONENT: ", this.searchFields);
}

Angular2