Error: The function this.form._updateTreeValidity does not exist

Question

Error: The function this.form._updateTreeValidity does not exist

Currently utilizing Angular Forms version 2.0.0, I am in the process of creating a contact us modal that contains a contact form.

Upon loading the ContactComponent, an exception is thrown:

EXCEPTION: this.form._updateTreeValidity is not a function

https://i.sstatic.net/AXg1p.jpg

After researching various Stack posts, it seems that initializing the form object using FormGroup instead of FormBuilder in the component constructor is now preferred with the new API, so I have made the necessary updates.
I have imported ReactiveFormsModule and FormsModule along with all the relevant form components, and there doesn't appear to be any module-related issues.
Although my TypeScript code compiles without errors and Visual Studio Intellisense recognizes all FormGroup functions correctly, I'm encountering this issue at runtime. Why is this happening?...

Here is my code:

...

javascript angular validation typescript angular2-forms

Answer 1

Answer №1

When the template variable #contactForm is bound, it triggers a name conflict and disrupts the template processor's attempt to convert the attached template variable into an NgForm on the backend. In all instances where model driven forms are employed, there is no template variable binding on the form; instead, a #tv="ngForm" is used in template driven forms. It seems that there was an oversight in mixing these two form approaches, leading to the error.

The problem can be easily solved by simply removing the template variable binding.

Answer 2

When the template variable #contactForm is bound, it triggers a name conflict and disrupts the template processor's attempt to convert the attached template variable into an NgForm on the backend. In all instances where model driven forms are employed, there is no template variable binding on the form; instead, a #tv="ngForm" is used in template driven forms. It seems that there was an oversight in mixing these two form approaches, leading to the error.

The problem can be easily solved by simply removing the template variable binding.

Answer 3

Answer №2

If you mistakenly include formGroup="..." in your template instead of [formGroup]="...", you will encounter this error message.

Answer 4

If you mistakenly include formGroup="..." in your template instead of [formGroup]="...", you will encounter this error message.

Answer 5

Answer №3

My mistake occurred when I mistakenly utilized the HTML attribute within the template:

<form formGroup="..."></form>

The correct approach is to use the Angular attribute instead:

<form [formGroup]="..."></form>

Answer 6

My mistake occurred when I mistakenly utilized the HTML attribute within the template:

<form formGroup="..."></form>

The correct approach is to use the Angular attribute instead:

<form [formGroup]="..."></form>

Answer 7

Answer №4

This issue may arise when attempting to pass the name of the formGroup as a string using [formGroup]. Instead, use formGroupName.

Answer 8

This issue may arise when attempting to pass the name of the formGroup as a string using [formGroup]. Instead, use formGroupName.

Answer 9

Answer №5

After some time, I finally figured out the issue I was having with my formGroup in the template.

For example, this approach would not work

<ng-template #selectField
             let-field
             let-group
             let-frmName="frmName">
    <ng-container [formGroup]="group">
        <mat-form-field fxFlex="32"
                        floatLabel="always">
            <mat-label>{{field.label}}</mat-label>
            <mat-select [formControlName]="frmName"
                        [required]="field.required">
                <mat-option *ngFor="let option of field.options"
                            [value]="option.value">
                    {{option.description}}
                </mat-option>
            </mat-select>
        </mat-form-field>
    </ng-container>
</ng-template>

I discovered that if I reference my formGroup directly, it works perfectly fine.

Hopefully, this information is helpful to you too.

Answer 10

After some time, I finally figured out the issue I was having with my formGroup in the template.

For example, this approach would not work

<ng-template #selectField
             let-field
             let-group
             let-frmName="frmName">
    <ng-container [formGroup]="group">
        <mat-form-field fxFlex="32"
                        floatLabel="always">
            <mat-label>{{field.label}}</mat-label>
            <mat-select [formControlName]="frmName"
                        [required]="field.required">
                <mat-option *ngFor="let option of field.options"
                            [value]="option.value">
                    {{option.description}}
                </mat-option>
            </mat-select>
        </mat-form-field>
    </ng-container>
</ng-template>

I discovered that if I reference my formGroup directly, it works perfectly fine.

Hopefully, this information is helpful to you too.

Answer 11

Answer №6

I recently encountered an issue with my dynamic form where I received an error message because I forgot to initialize it inside the ngOnInit() function.

To resolve this problem, follow these steps:

checkInForm: FormGroup;

ngOnInit(){
    this.checkInForm = this.formBuilder.group({});
}

Answer 12

I recently encountered an issue with my dynamic form where I received an error message because I forgot to initialize it inside the ngOnInit() function.

To resolve this problem, follow these steps:

checkInForm: FormGroup;

ngOnInit(){
    this.checkInForm = this.formBuilder.group({});
}

Answer 13

Answer №7

If you encounter this situation, it may be due to using the input name formControl or formGroup on a custom component that is not actually a form control.

To resolve this issue, simply modify your custom component to accept a different input name:

Replace the following code snippet:

@Input()
formGroup: string
// ^ This causes problems

With the following code snippet:

@Input()
group: string

Answer 14

If you encounter this situation, it may be due to using the input name formControl or formGroup on a custom component that is not actually a form control.

To resolve this issue, simply modify your custom component to accept a different input name:

Replace the following code snippet:

@Input()
formGroup: string
// ^ This causes problems

With the following code snippet:

@Input()
group: string

Answer 15

Answer №8

I accidentally overlooked passing my form to the reusable input component

<app-input [form]="myForm"></app-input>

app-input.component.html

<form [formGroup]="form">
  <input [type]="type" [placeholder]="placeholder" [formControlName]="formControlName" />
</form>

app-input.component.ts

@Input() type: string = '';
@Input() placeholder: string = '';
@Input() formControlName: string = ''
@Input() form: FormGroup = {} as FormGroup;

Answer 16

I accidentally overlooked passing my form to the reusable input component

<app-input [form]="myForm"></app-input>

app-input.component.html

<form [formGroup]="form">
  <input [type]="type" [placeholder]="placeholder" [formControlName]="formControlName" />
</form>

app-input.component.ts

@Input() type: string = '';
@Input() placeholder: string = '';
@Input() formControlName: string = ''
@Input() form: FormGroup = {} as FormGroup;

Error: The function this.form._updateTreeValidity does not exist

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Replace the following code snippet:

With the following code snippet:

Answer №8

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