No value accessor for form control

Question

I'm using Angular2-rc5, and I'm currently getting an error on my login page. I'm trying to make a form but the console throws exceptions telling me that it can't find my formcontrolls even though I create it on init. Any idea why I'm getting this error?

login component

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms';
import { LoginService } from './login.service';
import { User } from '../../models/user';
    
@Component({
    selector: 'login',
    providers: [LoginService],
    templateUrl: './login.component.html',
    styleUrls: ['./login.component.css']
})
export class LoginComponent implements OnInit {
    private loginForm: FormGroup; // our model driven form
    private submitted: boolean; // keep track on whether form is submitted
    private events: any[] = []; // use later to display form changes
    
    constructor(private fb: FormBuilder, private ls:LoginService){}
    ngOnInit(){
        this.loginForm = new FormGroup({
            email: new FormControl('',[<any>Validators.required]),
            password: new FormControl('', [<any>Validators.required, <any>Validators.minLength(6)]),
            rememberMe: new FormControl()
        });
    }
    save(model: User, isValid: boolean) {
        console.log("Test");
        console.log(model, isValid);
    }
    // Login in user
    login(email: any, password: any){
        this.ls.login(email, password, false); 
    }
}

Page.html

<div id="login-page">
    <div class="form-wrapper">
        <form class="login-form" [formGroup]="loginForm" novalidate (ngSubmit)="save(loginForm.value, loginForm.valid)">
            <div >
                <div class="input-field col s12 center">
                    <p class="center login-form-text">Login page</p>
                </div>
            </div>
            <div >
                <div class="input-field col s12">
                    <input id="email" type="email"> 
                    <label class="center-align" for="email" formControlName="email">Email</label>
                </div>
            </div>
            <div >
                <div class="input-field col s12">
                    <input id="password" type="password"> 
                    <label class="center" for="password" formControlName="password">Password</label>
                </div>
            </div>
            <div >
                <div class="input-field col s12 m12 l12 login-text">
                    <input id="remember-me" type="checkbox" formControlName="rememberMe">
                    <label for="remember-me">Remember me</label>
                </div>
            </div>
            <div >
                <div class="input-field col s12">
                    <ahref="index.html">Login</a>
                </div>
            </div>
            <div >
                <div >
                    <p><a href="page-register.html">Register Now!</a></p>
                </div>
                <div >
                    <p><a href="page-forgot-password.html">Forgot password ?</a></p>
                </div>
            </div>
        </form>
    </div>
</div>

Exception

EXCEPTION: Uncaught (in promise): Error: Error in ./LoginComponent class LoginComponent - inline template:13:45 caused by: No value accessor for form control with name: 'email'.....

Answer 1

You are adding the formControlName to the label and not the input.

You have this:

<div >
  <div class="input-field col s12">
    <input id="email" type="email"> 
    <label class="center-align" for="email" formControlName="email">Email</label>
  </div>
</div>

Try using this:

<div >
  <div class="input-field col s12">
    <input id="email" type="email" formControlName="email"> 
    <label class="center-align" for="email">Email</label>
  </div>
</div>

Update the other input fields as well.

Answer 2

For UnitTest angular 2 with angular material you have to add MatSelectModule module in imports section.

import { MatSelectModule } from '@angular/material';

beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ CreateUserComponent ],
      imports : [ReactiveFormsModule,        
        MatSelectModule,
        MatAutocompleteModule,......

      ],
      providers: [.........]
    })
    .compileComponents();
  }));

Answer 3

For anyone experiencing this in angular 9+

This issue can also be experienced if you do not declare your component or import the module that declares the component.

Lets consider a situation where you intend to use ng-select but you forget to import it Angular will throw the error 'No value accessor...'

I have reproduced this error in the Below stackblitz demo.

Answer 4

If you get this issue, then either

• the formControlName is not located on the value accessor element.
• or you're not importing the module for that element.

Answer 5

If you must use the label for the formControl. Like the Ant Design Checkbox. It may throw this error while running tests. You can use ngDefaultControl

<label nz-checkbox formControlName="isEnabled" ngDefaultControl>
    Hello
</label>

<nz-switch nzSize="small" formControlName="mandatory" ngDefaultControl></nz-switch>

Answer 6

In my case I was using ionic, I was trying to unit test ion-input with jasmine karma. I was getting the no value accessor error in the karma browser while running the tests. So I just added the ngDefaultControl to the ion-input and it solved the problem.

<ion-input class="password" [(ngModel)]="user.password" name="password" 
                type="password" #pw="ngModel" required ngDefaultControl>
</ion-input>

Answer 7

In some cases you might missed to add NG_VALUE_ACCESSOR in reusable component as provider.

@Component({
    selector: 'app-reusable',
    templateUrl: './reusable.component.html',
    styleUrls: ['./reusable.component.scss'],
    providers: [
        {
            provide: NG_VALUE_ACCESSOR,
            useExisting: forwardRef(() => ReusableComponent),
            multi: true,
        },
    ],
})

Answer 8

OR

You need to move your formControlName="controlName" to the <mat-radio-group> wrapper instead of binding it to the individual <mat-radio-button> element (s)

Answer 9

For me I was using primeng dropdown in angular app. The module for dropdown was not imported.

Answer 10

In my case, I used Angular forms with contenteditable elements like div and had similar problems before.

I wrote ng-contenteditable module to resolve this problem.

Answer 11

You can see formControlName in label , removing this solved my problem

Answer 12

    constructor(
    private cdr: ChangeDetectorRef,
    @Optional() 
    @Self() public ngControl: NgControl,
    ) {

    if (ngControl) {
        ngControl.valueAccessor = this;
      }

}

In my case, add this line in custom Control (reuseable) component's constructor

if (ngControl) {
        ngControl.valueAccessor = this;
      }

Answer 13

For me, I had the error with ionic date pickers only, I had to import the IonicModule to my lazy-loaded module