Flutter Validation with Provider

In this video we'll explore a pattern for validating data in Flutter using just the Provider package with no streams or BLoCs.
Article:
julow.com/article/1
Github:
github.com/nhandrew/validatio...
Social Media:
/ andyjulow

[@blankchequecorp]

I have been following all your tutorials on flutter. Thanks to you I understand flutter now and i am enjoying it. Your methods of teaching is very simple, clear and comprehensive. I had to abandon the Udemy courses i am taking on flutter. I am still getting a hang of it, but with you holding my hand, I should be able to stand in a short time. Thank you very much and God bless you. Emmanuel Lagos, Nigeria

[@DguruZ]

Thanks so much Andy, I've have started loving Provider

[@jessiet5189]

Nice tutorial! Clear, plain and simple. Exactly what I need. Thanks for sharing Andy.

[@robsonsilv4.]

Thanks Andy, you make a great serie about Provider.

[@marcelo4205]

Thanks a lot, Andy. Great video and very well explained.

[@chetan6406]

Clear , concise and very well explained...thanks for this video.

[@MrLyonliang]

Thanks a lot. I like this pattern too, which seperates business logic from UI and let the UI Reactive & Declarative, thanks again.

[@philipretl9428]

Thanks for your video, greetings from Colombia.

[@scottatkinson6339]

Absolutely awesome! thanks for creating the video!!!

[@andyjulow4388]

Thanks for the topic suggestion. I like the way provider worked out here.

[@MrAidooyaw]

I'm going to check out that validation provider package First time I'm seeing such a thing

[@sakwebetrandcliff1151]

Thanks for the tutorial, it was explicit.

[@phuongnhi7859]

thank you for your video. It's helpful to me

[@fouad_alshamy]

Good job Andy

[@aminafrazandeh825]

nice video , it helped me!

[@reach5593]

Thanks Andy!

[@kev001able]

Great video 👍🏼

[@jahangirshah2747]

Thank u very much sir.

[@MrAidooyaw]

I like this pattern more than the normal form widget whereby u have to press the submit button before validation works

[@jofercho]

beautiful

[@user-vo7lq1jt5v]

Thanks for your tutorial. Your explonation was very helpfull for me. I see that because you have one provider for all fields on screen, when value changed in one field, other fields also rebuilds, isn't it better to have separate provider each field? What if for example create parent class with ChangeNotifier (for example StandartTextFieldValidation with ChangeNotifier) write there common logic and create children classes for each provider for each field in form?

[@jeffersonsantosangulo1626]

thanks

[@nikhilpatil8798]

Thank u so much really appreciate it. Can u increase the font size? The font size is too small.

[@asif_imtiaz]

it would be awesome if you could add in, how to reset the TextField values after submit button.

[@double8tz]

Thanks for great tutorial,but my question is does it mean that whole form rebuild each time the input form is validated?

[@juniordev4190]

Yes, whenever you trigger the notifyListeners() method, the whole UI rebuilds. To avoid a larger UI rebuild, you could use a consumer or selector widget which enables you to change a small part of the UI.

[@AlexAstudillo1]

Hello, how to set internalizations, for example in the error message multilanguage English "Error length" Spanish "Error de longitud"

[@MohamedIbrahim-rs7uy]

thank you Andy, after submitting the form i want add a navigate to a new screen how to do that? onPressed: (!validationService.isValid) ? null : validationService.submitData //here i want the navigation

[@andyjulow4388]

Hi Mohamed, one approach would be to declare a stream in signup_validation.dart that you pass a value to in the submitdata function to indicate the record save is complete. You can then convert the signup page to a stateful widget and setup a listener to listen for changes and Navigate to the desired page.

[@IbrahimAlkuwaifi]

You could also do something like this bool isValid() { if (_email.value != null && _password.value != null) { print('${_email.value} + $_password'); return true; } else { return false; } notifyListeners(); } and then in your sign in page onPressed: validationService.isValid() ? () { validationService.submitData(context); } : null, then your submit can be like this for example void submitData(BuildContext context) { Navigator.pushNamed(context, NavigationDrawer.id); }

[@ihebhmida9469]

don't follow this shit, thank me later :)

[@badaruoluwasegun586]

Kindly share your reason as that would be appreciated.