Angular Shape Control Values ​​Modified Broken

Question

I want to get one of my forms ("family") value if it has changed by signing, but it seems something is wrong, because I did not get anything in my console log.

import { Component , AfterViewInit } from '@angular/core';
import {FormGroup,FormBuilder} from '@angular/forms';
import {Observable} from 'rxjs/Rx';

@Component({
selector: 'app-root',
template: `<h1>Hello World!</h1>
            <form [formGroup]="frm1">
            <input type="text" formControlName="name" >
            <input type="text" formControlName="family">
            </form>
            `,

})

export class AppComponent implements AfterViewInit{ 

 frm1 : FormGroup;

constructor( fb:FormBuilder){
    this.frm1 = fb.group({
        name : [],
        family: []
    });     
}
ngAfterViewInit(){  
    var search = this.frm1.controls.family;
    search.valueChanges.subscribe( x => console.log(x));    
}
}

Answer 1

Use method getfor form variablefrm1

ngOnInit(){  
      this.frm1.get('family').valueChanges.subscribe( x => console.log(x));
}

Answer 2

Try the following:

import { Component , AfterViewInit, OnInit } from '@angular/core';
import {FormGroup,FormBuilder} from '@angular/forms';
import {Observable} from 'rxjs/Rx';

@Component({
selector: 'app-root',
template: `<h1>Hello World!</h1>
        <form [formGroup]="frm1">
        <input type="text" formControlName="name" >
        <input type="text" formControlName="family">
        </form>`})

export class AppComponent implements AfterViewInit, OnInit{ 

frm1 : FormGroup;

constructor( private formBuilder: FormBuilder){}

ngOnInit(): void {
    this.formInit();
    this.formSet();
}

formInit(): void {
    this.frm1 = this.formBuilder.group({
        name: [''],
        family['']
    })
}

formSet(): void {
    const editForm = {
        name: 'test-name',
        family: 'test familty',
    };
    this.frm1.patchValue(editForm) 
}

ngAfterViewInit(){  
this.frm1 .controls.family.valueChanges.subscribe(
       () => {
              console.log(this.frm1 .controls.family.value)
             }
        )
      }
}