I'm seeking clarity on the proper replacement for ngModel within this Angular code, as I've been cautioned about using form control name and ngModel simultaneously

I have been using ngModel and formControlName together, which is causing a warning to appear in the console. I am trying to resolve this issue by removing ngModel, but I'm unsure of what to replace it with. I've attempted a few solutions, but none seem to work.

Below is my component.html file:

<mat-select
    formControlName="store"
    [(ngModel)]="this.form.value['store']"
    (selectionChange)="changestore()"
    multiple>
</mat-select>

This is my component.ts file:

changestore(){
 this.storeTechData.forEach((element:any)=> {
  if(this.form.value['store'].includes(element['store_id'])){
     element['active'] = true;
     }else{
      element['active'] = false;
     }
   });
 }

I have tried implementing reactive forms, but they are not providing the desired output. Can someone assist me in replacing ngModel with either reactive forms or another solution that will achieve the required functionality without triggering any warnings in the console?

Answer №1

Concerning forms in Angular:

It is recommended to choose one approach when constructing forms in your application. Namely, you should use either ngModel or formControlName but not both (hence why Angular gives a warning if both are present on a form element)

Reactive

component.html

<form [formGroup]="form">
  <mat-select
    formControlName="store"
    (selectionChange)="changestore()"
    multiple>
  </mat-select>
</form>

component.ts

form = new FormGroup({
  store: new FormControl('')
})

Template-driven

component.html

<form>
  <mat-select
    [(ngModel)]="store"
    (selectionChange)="changestore()"
    multiple>
  </mat-select>
</form>

component.ts

store: string = ''

In general, reactive forms offer a more versatile approach to learn, so it is advised to familiarize yourself with this method (pros and cons of both). However, for this simple scenario, either method will suffice and the choice comes down to personal preference.

Note: I have not delved into the specifics of the changestore function as its objective is unclear and some implementation details are missing. Hopefully, this information provides enough guidance for you to determine the necessary steps on your own

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