In this tutorial I will show you how to validate user inputs in Flutter using:
Read moreHow do you use form fields in Flutter?
To implement form fields, Flutter provides us with the FormField class, which all form fields extend . This class is a simple widget, that has the following properties: initialValue : The initial value to display in the field. builder : A callback that is responsible for building the widget inside the form field.
Read moreWhat is form field in Flutter?
A single form field. This widget maintains the current state of the form field, so that updates and validation errors are visually reflected in the UI . When used inside a Form, you can use methods on FormState to query or manipulate the form data as a whole. For example, calling FormState.
Read moreHow do you create an input form in Flutter?
In this example, we are going to display the alert dialog with the current value of the text field when the user taps on a button.
Read moreHow do I create a validate and save form in Flutter?
and a Sign-Up button.
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