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Vaadin Forum1. Vaadin Flow - Java

vaadin 8, TextField, show Validation on UI

Andrey Kascheev
6 years ago Mar 20, 2017 10:19am

hello!
I'am trying to migrate my login Form from Vaadin 7 to Vaadin 8, all looks fine, but validation messages do not show in UI on
unchanged Fields. For examlpe if my PasswordField has not changed by user, the validation massage will not show in UI on that Field.
In Vaadin 7 I used setValidationVisible(true) method
 

Andrey Kascheev
6 years ago Mar 20, 2017 11:53am

I've found a better solution: Do not enable LOGIN button until valadate is true:
binder.addValueChangeListener(event -> loginBtn.setEnabled(binder.isValid()));