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how to pass data to a form in another component in Angular

I have a form in a seperate component which looks like this:

<form [formGroup]="form">
    <div class="card" style="margin-bottom: 10px" >
    <input 
        formControlName="name" 
        type="text"
        placeholder="please enter"
        />
</div>
</form>

the ts file looks like this (formcontrol part)

 form = this.builder.group({
    name: new FormControl(),
  })

this is how I call it from the other component: component B:

 <form></form>

What I want to achieve now is the following I am filling some values from my backend which works, I know want to asign these values to my form from the form component. I know I have to use @Input I am kinda stuck against a wall and dont know how to connect them. Can someone give me a small example how I can fill my form from values from component b?

To my knowledge I have posted the most important part of this question, if anything else is needed feel free to ask

UPDATE_ Form.ts

@Input()
  myObject: { name: string };

  form = this.builder.group({
      name: new FormControl()
  });

  ngOnChanges(changes: SimpleChanges): void {
      if (changes.myObject?.currentValue) {
          this.form.patchValue(this.myObject);
      }
  }

UPDATE2:

my form ts looks like this now:

   @Input()
    myObject: { name: string };

    form = this.builder.group({
        name: new FormControl()
    });


ngOnChanges(changes: SimpleChanges): void {
    if (changes.myObject && changes.myObject.currentValue) {
      this.form.patchValue(this.myObject);
    }
  }

My form.hml like this:

<form [formGroup]="form">
    <div class="card" style="margin-bottom: 10px" >
    <input 
        formControlName="name" 
        type="text"
        placeholder="please enter"
        />
</div>
</form

my calling component ts like this:

this.form.controls.legitimiertePersonNameField.setValue(response.vorname)
      this.someName = this.form.controls.legitimiertePersonNameField.value -> gets the data from formcontrol in parent/calling

html from caling looks like this:

  <gwg-form [myObject]="someName"></gwg-form>

The someName value is correct I could see it in a console.log but it does not set the value for the fomrCOntrol of the form.html it is just empty input

about 4 years ago · Juan Pablo Isaza

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Answer 1 · 2022-07-10T06:08:58.398Z

form.component.ts

@Component({
    selector: 'my-form'
    ...
})
export class FormComponent implements OnChanges {
    
    @Input()
    myObject: { name: string };

    form = this.builder.group({
        name: new FormControl()
    });

    ngOnChanges(changes: SimpleChanges): void {
        if (changes.myObject?.currentValue) {
            this.form.patchValue(this.myObject);
        }
    }
}

form.component.html

<form [formGroup]="form">
  <div class="card" style="margin-bottom: 10px" >
    <input 
        formControlName="name" 
        type="text"
        placeholder="please enter" />
  </div>
</form>

calling.component.ts

@Component({ ... })
export class CallingComponent {
    
    someObject: { name: string };

    loadData(): void {
        this.someObject = ...
    }
}

calling.component.html

<my-form [myObject]="someObject">
</my-form>

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