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Forms are usually one of the major interaction points between an app and the user. Forms can be the bottleneck of the conversion funnel so we need to pay special attention to the form UX. Specially on mobile devices and narrow screens.
If we are building Ionic Angular applications, we can make use of the powerful
@angular/forms library. Angular offers two form-building technologies: reactive forms and template-driven forms. Also, Angular offers different ways to validate a form.
When should we perform the form validation? The key is to avoid interrupting and annoying the user. There are different strategies you can follow here like "real time validation" or "on blur validation". Also, it's very important to handle the error messages appropriately.
The following tutorials go deeply on these topics and include free code examples that you can reuse on your Ionic projects.
If you want examples of Forms Input Validations in Ionic projects, I suggest you check out this Ionic Template which includes lots of useful examples of input validations, such as matching passwords, valid phone number by country, unique username validator, as well as many other examples that will save you a lot of time.