Encountering difficulty in resetting the reactive form within the .then() function block

I am relatively new to working with Angular and Firebase, and I have encountered an issue with resetting my form after a successful registration process. In my "Register.component.ts" file, I have a method called registration() which is triggered when the user clicks on the submit button.

The problem I am facing is that although the data is successfully saved in Firebase, the form fields are not being reset or cleared. If I attempt to interact with any of the form fields immediately after submitting, all the input fields reset. How can I effectively reset the form once the data has been saved to the real-time Firebase database?

I have noticed that if I move the this.buildForm() function outside of the .then() block, the form resets properly. However, when I place it inside the .then() block, the form does not reset even though I am able to log the return value. I also attempted using asynchronous functions with async/await, encountering the same issue. Inside the try block, if I execute this.buildForm() before this.auth.register(formData), it works as expected; but if I run it afterwards, it does not work.

Upon logging values for this both inside and outside of the .then() block, I found that the values remain consistent. Below are snippets from the code relevant to the component, service, and HTML files:

Register.component.ts


// Import statements and component declaration here
// Code for RegisterComponent class including methods like buildForm(), register(), and cancel()

Register.component.html


<!-- HTML template for the registration form -->

auth.service.ts


// Import statements and AuthService class definition here
// Methods for registering user and adding user to the database

Answer №1

Consider implementing the following in your TypeScript code:

@ViewChild(FormGroupDirective) _formGroupDirective: FormGroupDirective;
// If you're using @angular 8, use:
// @ViewChild(FormGroupDirective, {static: false}) _formGroupDirective: FormGroupDirective;

...

register(formData: User) {
  this.auth
      .register(formData)
      .then(data => {
        if (data) {
          // Avoid triggering validation messages after resetting form with Validators.required fields

          this._formGroupDirective.resetForm();

          // Mark email as untouched to prevent valid message from showing
          this.myForm.get('email').markAsUntouched();
        }
      })
      .catch(err => console.error(err.message));
}

To prevent displaying the validation message (email is available) for a valid e-mail after submitting and clearing the form, modify your template code like so:

<div *ngIf="myForm?.get('email')?.valid && !myForm.get('email')?.untouched" class="text-success">
  {{ myForm?.get('email')?.value }} is available
</div>                     

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