failed to set value to the formControl

I am trying to set value to a formConfrol Field ReferCode, by taking value of a variable coming from Route name reff , where I am unable to set it

I am sharing code

ts >

ReferCode = new FormControl('');
  Refrr : any;
  constructor(

    private _route: ActivatedRoute,
  ) {
     this.user = new FormGroup({
    'ReferCode': this.ReferCode,
    });
    this._route.queryParams.subscribe(params => {
     this.Refrr = params['referral'];
     console.log(this.Refrr);
     if(this.Refrr){
     this.user.controls['ReferCode'].setValue(this.Refrr);
     this.user.controls['ReferCode'].patchValue(this.Refrr);
     }

html

 <form class="signin-form" novalidate (ngSubmit)="user_signup(user)" [formGroup]="user">

            <mat-form-field class="form-input-width">
              <input
                matInput
                placeholder="Enter Referral Code: (Optional)"
                value=""
                name="ReferCode"
                [(ngModel)]="referCode"
                formControlName="ReferCode"
              />

      <button mat-button >
        Sign Up
      </button>
    </form>

The best approach is like this use patchValue().

Try this out, it will definitely help you a lot in future too

this.user.patchValue({ReferCode:this.Refrr})

Input element's value attribute is not set � Issue #18725 � angular , When initializing a FormControl with an initial value, the html input element's value attribute is not set. Expected behavior. The value attribute of� I could be wrong here but from my understanding the FormControl get's your ValueAccessor as an injection, that's what this is setting up here, in which case the FormControl is not available from your accessor. { provide: NG_VALUE_ACCESSOR, useExisting: DateInputComponent, multi: true, } So you'd have to wrap FormControl instead :D

Html:

<form class="signin-form" novalidate (ngSubmit)="user_signup(user)" [formGroup]="user">
    <mat-form-field class="form-input-width">
        <input
                matInput
                placeholder="Enter Referral Code: (Optional)" 
                name="ReferCode" 
                formControlName="ReferCode"
        />
    </mat-form-field>
        <button mat-button >
            Sign Up
        </button>
</form>

TS:

this.user.setValue('ReferCode', this.Refrr);

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In template driven forms to set values to part of the form

@ViewChild('f') signupForm: NgForm;
this.signupForm.form.patchValue({
userData: {
    username: suggestedName
  }
});

In reactive forms, you can use

signupForm: FormGroup;
this.signupForm.patchValue({
userData: {
    username: 'suggestedName'
  }
});

you can set default values inside ngOnInit() or using a click event (within a method).

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Comments
  • can you remove [(ngModel)]="referCode" and try again.
  • yes I think you can't use ngModule and formControl together
  • @MohammadrezaImani Exactly!!!
  • ReferCode is a standalone form control but you seem to update a form group called user. Are the two bound in any way ?