The discontinuation of combining formControlName and ngModel in Angular 6 is causing changes to form handling

I recently encountered a warning in my Angular 6 project while using ngModel and formControlName together. Specifically, when trying to bind inputs in an update popup, I received a warning from Angular 7 advising me to remove ngModel. The suggested approach now is to always map everything to my student object. What would be the most effective way to achieve this? Is it possible to set a formValueType for the form value, such as studentObject in the code snippet below, in order to automatically bind?

Angular warning:

     It looks like you're using ngModel on the same form field 
as formControlName. Support for using the ngModel input property and 
ngModelChange event with reactive form directives has been deprecated
 in Angular v6 and will be removed in Angular v7.

myHtml

<form [formGroup]="studentForm" ??????formValueType="studentObject"?????>
  <p-dialog>
    <div class="ui-g-12 form-group">
      <div class="ui-g-4">
        <label>Name Surname</label>
      </div>
      <div class="ui-g-8">
        <input pInputText [(ngModel)]="selectedStudent.nameSurname"  formControlName="nameSurname" />
      </div>
    </div>
    <div class="ui-g-12 form-group">
      <div class="ui-g-4">
        <label>Email</label>
      </div>
      <div class="ui-g-8">
        <input pInputText [(ngModel)]="selectedStudent.email" formControlName="email" />
      </div>
    </div>
        <div class="ui-g-12 form-group">
          <div class="ui-g-4">
            <label>Age</label>
          </div>
          <div class="ui-g-8">
            <input pInputText [(ngModel)]="selectedStudent.age"  formControlName="age" />
          </div>
        </div>
      </div>
    <button type="button" pButton icon="fa fa-check" (click)="save()" label="Save"></button>
  </p-dialog>
</form>

Answer №1

It's quite unusual to have both ngModel and formGroup together. It would be better to eliminate the use of ngModel and instead bind to valueChanges on the formGroup. Then, you can simply loop through the received data and assign values accordingly.

// In a section where the form is constructed
this.studentForm.valueChanges.subscribe(data => this.onStudentFormValueChange(data));

private onStudentFormValueChange(data) {
    this.selectedStudent.age = data.age;
    this.selectedStudent.email = data.email;
    this.selectedStudent.nameSurname = data.nameSurname;

    // or
    for (const key in this.studentForm.controls) {
        const control = this.studentForm.get(key);
        this.selectedStudent[key] = control.value;
    }
}

Answer №2

When building a form in Angular, you have the option to choose between using ngModel for template-driven forms or formControlName for reactive forms. https://angular.io/guide/reactive-forms For a simple form, you can eliminate formControlName from each input field. If you wish to add more functionality to your form, consider switching to reactive forms by removing ngModel and instead adding a name attribute like name=nameSurname

Answer №3

There is no requirement to utilize both (ngModel and formControlName)

When updating, you have the option to employ reactive form using

 patchValue(value: {...}, options: {...}): void

https://angular.io/api/forms/FormGroup

In your situation, you will require something along the lines of

this.studentForm.patchValue({
  nameSurname : 'Some Name',
  email : '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c1a4b9a0acb1ada481a4aca0a8adefa2aeac">[email protected]</a>',
  age : '24'
})

This action will populate the form with values and facilitate ease of use for updates

Answer №4

One efficient approach involves utilizing ReactiveForms in conjunction with formGroup and formControlName. To streamline the process, consider parsing your object and generating a new parameter for each element based on its key. Afterwards, you can seamlessly update the formGroup with your modified object.

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