Just published an article on form validations and state hand

Question

Just published an article on form validations and state handling in Jetpack Compose I do hope to see the support in the solution raised hands <https blog naingaungluu me declarative form validation on jetpack compose e87c0d97c802>

CLOVIS · Answer

Hi thanks for the article However I m not convinced by the problems you bring up First I don t like annotation validation because it s harder to extend than regular classes How does the user create a new validator How can users combine validators I read your documentation and the boilerplate is manageable but it s still far from native Kotlin ``` JvmInline value class Email val text String init require in text ``` Besides value classes are regular types of the language meaning they can be combined as fields of other classes etc to build complex data types

CLOVIS · Answer

I do agree that regular validation in Compose is a bit verbose because we can t add setter to delegated properties but I find this much clearer ```class FormData private var email Email by mutableStateOf null var email get = email set value require value text length lt 100 email = value ``` What benefits does your approach bring over this style

CLOVIS · Answer

By creating a small utility delegate the previous example can be written ```class FormData var email by validate mutableStateOf lt Email gt null require it text length lt 100 ```

Naing Aung Luu · Answer

Hey < CLOVIS> Thanks for taking the time to check the library and the documentation As for the solution I m aiming for the reusability and state management You ll notice when using in an actual project that it supports realtime validation and orchestration of entire form state with just a few lines of code Of course we could combine the states as `derivedState`s manually if we want I love your approach on the solution too In fact property delegates and value classes would suffice for smaller projects perfectly The library actually supports combined validators and custom validators ``` Form data class FormData EmailAddress MinLength 2 MaxLength 10 val emailAddress String ``` The library also supports the `value` classes as Field types And extending the existing validators is also easy as well You ll notice that annotations and actual validation implementations are separated as ` Annotation` and `ValidationRule` It tries to provide those reusable APIs as building blocks for the form

CLOVIS · Answer

Thanks for your answer slightly smiling face I don t think I ll use the library personally but it s great to see the ecosystem growing

Naing Aung Luu · Answer

Sure Whatever fits the project works right Compose is really gaining the momentum