Developing Angular 7 Forms with Conditional Group Requirements

I am currently in the process of developing a form that enables users to configure their payment preferences. The form includes a dropdown menu where users can select their preferred payment method. For each payment method, there is a FormGroup that contains specific options for that selected method:

form: FormGroup = new FormGroup({
        method: new FormControl('paypal', {
            validators: [
                Validators.required,
            ],
        }),
        paypal: new FormGroup({
            email: new FormControl(null, {
                validators: [
                    Validators.required,
                    Validators.pattern(EMAIL_PATTERN)
                ],
            }),
        }),
        other: new FormGroup({
            email: new FormControl(null, {
                validators: [
                    Validators.required,
                    Validators.pattern(EMAIL_PATTERN)
                ],
            }),
        }),
    });

An issue I am encountering is that the form is only deemed valid if both FormGroups are considered valid.

However, it is my intention for the form to be deemed valid as soon as the FormGroup for the selected payment method is valid.

angularformstypescriptangular7angular-forms

Answer №1

If you have a unique validation requirement, consider creating a custom root-level FromGroup validator tailored to your specific needs.

Validators can be applied to entire FormGroups or individual FormControls, as they are both considered AbstractControls in Angular.

For guidance on creating custom validators, check out this helpful resource.

Update: Those interested in a quick solution can explore this stackblitz example: nested form validation

Answer №2

Perhaps one solution could be to deactivate unnecessary controls in order to prevent them from undergoing validation processes.

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