How To Validate Forms In Flutter.?

NEED:

To show that something is wrong with the submitted data, we use form validation.

Widgets Used:

1. Form

2. TextFormField

Lets go to the Steps:

STEP 1:

Inside your project, add a Scaffold with a Floating Action Button.

We use this button to submit and validate the form.

STEP 2:

Add a Form widget to the body of the Scaffold.Give a global key to this form to validate it from anywhere.

After that, add two TextFormField’s to the form.

STEP 3 :

Apply decoration and onChanged method to these Text Form Fields.

Then add the validator, which will validate the submitted string.

STEP 4 :

At last, when we press the FAB , we need to validate the form.

So, inside OnPressed method of FAB, carryout the validation of the form.

And DONE ..!