要包装TextFormField的验证器消息,可以使用validator属性。validator属性接收一个函数,该函数接收用户输入的值作为参数,并返回一个字符串作为验证器消息。如果返回的字符串为空,则表示验证通过;如果返回的字符串不为空,则表示验证失败,并将返回的字符串作为错误消息显示给用户。 下面是一个示例代码,演示了如何在Fl...
labelText: 'Email', ), validator: FormBuilderValidators.compose([ FormBuilderValidators.required(context), FormBuilderValidators.pattern( context, r'^[\w-]+(\.[\w-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*(\.[a-zA-Z]{2,})$', errorText: '请输入有效的邮箱地址', ), ]), )...
( validator: usernameValidation, decoration: InputDecoration( labelText: "Username*", ), ), TextFormField( validator: emailValidation, decoration: InputDecoration( labelText: "Email address*", ), ), TextFormField( validator: ageValidation, decoration: InputDecoration( labelText: "Age", hintText...
在Flutter中,可以通过以下步骤来添加两个TextFormField控制器: 步骤1:在Flutter项目中导入必要的包和库。一般来说,可以使用以下代码导入flutter/material.dart包: 代码语言:txt 复制 import 'package:flutter/material.dart'; 步骤2:在Flutter的widget中定义两个TextEditingController对象作为TextFormField的控制器。可...
百度试题 结果1 题目在Flutter中,如何处理表单验证? A. Form B. TextFormField C. Validator D. FormField 相关知识点: 试题来源: 解析 A 反馈 收藏
Steps to reproduce Create a Form in your Flutter App using a TextFormField(). Localize your Flutter app according to the docs. Build simple form validation according to the docs, by returning a localized string via the validator (e.g. Ap...
我是Flutter Development 的新手并尝试了某些解决方法,但没有任何帮助。我希望我的文本在 TextFormField 中 垂直 居中。
TextInputType.emailAddress TextInputType.url TextInputType.visiblePassword TextInputType.name TextInputType.streetAddress 1.2.4 键盘按钮 即键盘右下角按钮样式,比如完成或者Done TextField(textInputAction:TextInputAction.done,), 截屏2022-04-13 上午9.34.25.png ...
validator - 양식에 맞는 데이터인지 검사한다. return "에러"; 를 반환하면 errorText에 "에러"라는 메시지가 띄워진다. TextFormField( controller: _textEditingController, // initialValue: "initial Value", // controller 이 null 이 ...
Flutter makes it easy and fast to build beautiful apps for mobile and beyond - TextFormField validator return String doesn't expands to more than one line when running in a real IOS, works the right way in a simulator! · flutter/flutter@7e9d9e0