Reactive Form - Angular Tutorial Italiano 30

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Episodio 30 del corso di Angular completo. Oggi vediamo l'altro lato dei form in angular parlando dei reactive form. A differenza dei template driven, i reactive form vengono si costruiti in html, ma interamente gestiti lato typescript.

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Salve! Grazie per il corso, utile e ben fatto. Mi piacerebbe vedere un video dedicato alla validazione asincrona di un reactive form, personalmente mi sarebbe utilissimo
Saluti!

enricosbrighi

ciao edo è andato tutto bene fino a quando non ho fatto il p con ngIf, mi dice che 'object is possibly null' ma noi è cosi che volevamo impostarlo inizialmente a te non lo da forse è dato da qualche aggiornamento di angular oppure è una mia mancanza?

ryuzaky

Ho un errore "Property 'homeform' has no initializer and is not definitely assigned in the constructor."
Mi dice che praticamente non è definito ma vedo che nel tuo caso dentro il ctor non c'è nulla, come mai?

claudiofavia

A me da questo problema: (come lo si risolve?)
main.ts:6 ERROR Error: NG01350: ngModel cannot be used to register form controls with a parent formGroup directive. Try using
formGroup's partner directive "formControlName" instead. Example:

<div [formGroup]="myGroup">
<input formControlName="firstName">
</div>

In your class:

this.myGroup = new FormGroup({
firstName: new FormControl()
});

Or, if you'd like to avoid registering this form control, indicate that it's standalone in ngModelOptions:

Example:

<div [formGroup]="myGroup">
<input formControlName="firstName">
<input true}">
</div>
at modelParentException (forms.mjs:3840:12)
at NgModel._checkParentType (forms.mjs:4181:23)
at NgModel._checkForErrors (forms.mjs:4170:18)
at NgModel.ngOnChanges (forms.mjs:4099:14)
at (core.mjs:1779:14)
at callHook (core.mjs:2762:18)
at callHooks (core.mjs:2721:17)
at executeInitAndCheckHooks (core.mjs:2672:9)
at selectIndexInternal (core.mjs:9926:17)
at Module.ɵɵadvance (core.mjs:9909:5)

flaviuxful

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