TextFormField: 是 Flutter 中的一个表单控件,用于接收用户输入的文本。 验证(Validation): 在表单提交前,对用户输入的数据进行检查,以确保数据的正确性和完整性。 可能的原因 错误处理未设置: 没有正确设置validator属性或者errorText属性。 状态未更新: 验证失败后,表单的状态没有被正确更新。
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...
'Please enter a value Please enter a value Please enter a value Please enter a value'在InputDec...
child: TextFormField( //autovalidateMode: AutovalidateMode.onUserInteraction, validator: widget.validator, keyboardType: widget.isPhone ? TextInputType.phone : TextInputType.text, inputFormatters: [DialCodeFormatter()], controller: widget.controller, textAlign: TextAlign.center, obscureText: widget.is...
引入validation_extensions 1.0.1 三方库 使用到了Flutter 中的扩展函数 import'package:flutter/material.dart';import'package:validation_extensions/validation_extensions.dart';classFormContainerWidgetextendsStatefulWidget { FormContainerWidget({Key key}) :super(key: key); ...
TextFormField is auto-validating itself without updating its content causing the user to see red fields after he enter in a page containing +6 TextFormFields. Steps to Reproduce Run the following code: import 'package:flutter/material.da...
geterrorText=>_errorText.value;/// True if this field has any validation errors.boolgethasError=>_errorText.value!=null;/// Returns true if the user has modified the value of this field./// This only updates to true once [didChange] has been called and resets to/// false when [re...
Kubernetes和容器完全改变了我们对完成工作所使用的工具的看法。扩展自动化平台需要通过fork开发定制扩展，并...
How do I show validation errors?The text input components provide predefined validators that you can use, they are called inputMethodHints.You can also add custom validators to restrict the accepted input to a certain input type or expression. Input that does not match the validator is not ...
Flutter学习七:TextField练习 TextField相当于Android中的EditText代码如下:运行图如下: Edittext与seekbar的配合应用 一、本人这里写了一个小小的游戏插件,主要实现的功能是:seekbar滚动条的提示,以及Textview显示进度条的值和Edittext调节进度条的值,再就是记录消息的提示。1、这里是.xml文件的...().trim().leng...