Flutter comes with a native way of validating user inputs using the Form and TextFormField widget. In this tutorial I will show you how to validate user inputs in Flutter using: A validation mixin to contain validation logic. A Form widget with a GlobalKey. A TextFormField to collect ...
import'package:flutter/material.dart';import'package:validation_extensions/validation_extensions.dart';classFormContainerWidgetextendsStatefulWidget { FormContainerWidget({Key key}) :super(key: key); _FormContainerWidgetState createState()=>_FormContainerWidgetState(); }class_FormContainerWidgetStateextendsSt...
首先我创建了一个容器 import 'package:flutter/material.dart'; class TextFieldContainer extends StatelessWidget { final Widget child; const TextFieldContainer({ Key key, this.child, }) : super(key: key); @override Widget build(BuildContext context) { Size size = MediaQuery.of(context).size; re...
auth_controller.dart import 'package:flutter/material.dart'; import 'package:get/get.dart'; class AuthController extends GetxController { final formKey = GlobalKey<FormState>(); String userEmail = ''; String userName = ''; String userPassword = ''; String? emailValidator(String value) { if...
final String? Function(String?)? validator; AuthForm({Key? key, this.isPassword = false, required this.prefixIcon, required this.hintText, this.isCalendar = false, required this.controller, this.isDropDown = false, this.isPhone = false, required this.validator}) : super(key: key); ...
onPressed:() {print('valid: ${key.currentState!.validate()}'); }, ), ], ), ); } } Screenshots or Video No response Logs No response Flutter Doctor output Doctor output [✓] Flutter (Channel stable, 3.24.5, on macOS 14.6.1 23G93 darwin-x64, locale en-CO)• Flutter version ...
现在的情况是，validator回调返回的字符串很可能是空的（或者包含其他空格），Flutter会在文本和输入本身...
In order to create an input field in the form, along with the label, and any applicable validation, there are several attributes that are supported by all types of inputs namely:AttributeTypeDefaultRequiredDescription name String Yes This will form the key in the form value Map initialValue T...
在Flutter中,当你使用ListView来展示多个TextFormField时,确保每个TextFormField都有正确的验证逻辑是非常重要的。下面,我将根据提供的提示,逐步介绍如何在Flutter的ListView中为TextFormField添加验证逻辑。 1. 创建Flutter ListView并添加TextFormField 首先,你需要创建一个ListView,并在其中添加多个TextFormField。每个Text...
I tried to create this form with validation, so it shows the errors when the user returns each field. But for some reason it doesn't work. I have no reason why. I'm just stuck now. Here's the code: import'package:flutter/material.dart';import'package:validate/validate.dart';voidmain...