Validation 在没有活页夹的情况下调用验证用户反馈&;瓦丁豆8
在vaadin8中,内置的验证特性是通过连接到bean的as和as来建立的。我理解这是如何运作的,而且运作良好,我感谢瓦丁团队在那里的思考和努力 但是…我只需要一个简单的快速脏数据输入字段,只接受-1、0和1作为值。我喜欢Vaadin validation的特性,即通过将字段/标题标记为“砰”和红色等来拒绝错误输入 ➥ 有没有一种方法可以调用验证风格的反馈给用户,而不必费心去定义bean和建立绑定器Validation 在没有活页夹的情况下调用验证用户反馈&;瓦丁豆8,validation,vaadin,vaadin8,Validation,Vaadin,Vaadin8,在vaadin8中,内置的验证特性是通过连接到bean的as和as来建立的。我理解这是如何运作的,而且运作良好,我感谢瓦丁团队在那里的思考和努力 但是…我只需要一个简单的快速脏数据输入字段,只接受-1、0和1作为值。我喜欢Vaadin validation的特性,即通过将字段/标题标记为“砰”和红色等来拒绝错误输入 ➥ 有没有一种方法可以调用验证风格的反馈给用户,而不必费心去定义bean和建立绑定器 作为一种解决方法,我可以用一个弹出菜单(也称为下拉列表)替换我的数据输入字段。但我的问题在需要用
作为一种解决方法,我可以用一个弹出菜单(也称为下拉列表)替换我的数据输入字段。但我的问题在需要用户快速简单输入时仍然很有用,例如在对话框中,不需要所有的数据输入表单。
Binder
不是为单个字段使用而设计的
瓦丁8
使用Vaadin 8进行单字段验证的最佳替代方法是使用字段的ValueChangeListener
进行挂钩,并在值更改事件中执行所需的操作
AbstractComponent::setComponentError(ErrorMessage componentError)
注意,然而,在瓦丁8区,确实有方法。通过调用此方法,您可以使用ValueChangeListener
BysetComponentError(…)
对单个字段进行验证,从而获得与表单中的活页夹类似的外观和感觉。这适用于文本字段、按钮等
请参阅手册的第页
button.setComponentError( new UserError( "Bad click" ) ) ;
瓦丁7
和之间有区别。使用Vaadin 7,可以将验证器直接分配给字段。示例应用程序
该方法是正确的,解决了问题。解决方案是调用AbstractComponent::setComponentError
下面是一个完整的小型Vaadin 8.5.2应用程序,用于展示这一点
此应用程序有两个小部件,一个文本字段
和一个按钮
,可以标记为处于正常状态
…或处于错误的状态
这是应用程序的整个.java
文件
package com.basilbourque.example;
import javax.servlet.annotation.WebServlet;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.server.UserError;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.*;
import java.util.List;
import java.util.Set;
/**
* This UI is the application entry point. A UI may either represent a browser window
* (or tab) or some part of an HTML page where a Vaadin application is embedded.
* <p>
* The UI is initialized using {@link #init(VaadinRequest)}. This method is intended to be
* overridden to add component to the user interface and initialize non-component functionality.
*/
@Theme ( "mytheme" )
public class MyUI extends UI {
@Override
protected void init ( VaadinRequest vaadinRequest ) {
// TextField allows only 'dog' or 'cat' as values.
Set< String > animals = Set.of( "dog" , "cat" );
TextField dogOrCat = new TextField();
dogOrCat.setCaption( "Type dog or cat:" );
dogOrCat.addValueChangeListener( valueChangeEvent -> {
if ( animals.contains( dogOrCat.getValue() ) ) {
dogOrCat.setComponentError( null );
} else {
dogOrCat.setComponentError( new UserError( "Oops! You typed something other than 'dog' or 'cat'." ) );
}
} );
// Button which is deemed to be in good condition or erroneous condition by a radio buttons pair.
Button button = new Button( "Example" );
button.addClickListener( e -> {
Notification.show( "This button does nothing." , Notification.Type.HUMANIZED_MESSAGE );
} );
// Radio-buttons, to control the good or error condition of button above.
List< String > radioItems = List.of( "No error" , "Error" );
RadioButtonGroup< String > radios =
new RadioButtonGroup<>( "Make button:" );
radios.setItems( radioItems );
radios.setValue( radioItems.get( 0 ) ); // Set 1st item by default (index counting = 0).
radios.addValueChangeListener( valueChangeEvent -> {
if ( radios.getValue().equals( radioItems.get( 1 ) ) ) { // Index-counting, so `1` = 2nd list item "Error".
button.setComponentError( new UserError( "Bad button" ) );
} else {
button.setComponentError( null );
}
} );
// Arrange
final VerticalLayout layout = new VerticalLayout();
layout.addComponents( dogOrCat , button , radios );
setContent( layout );
}
@WebServlet ( urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true )
@VaadinServletConfiguration ( ui = MyUI.class, productionMode = false )
public static class MyUIServlet extends VaadinServlet {
}
}
package com.basilbourque.example;
导入javax.servlet.annotation.WebServlet;
导入com.vaadin.annotations.Theme;
导入com.vaadin.annotations.VaadinServletConfiguration;
导入com.vaadin.server.UserError;
导入com.vaadin.server.vaadin请求;
导入com.vaadin.server.VaadinServlet;
导入com.vaadin.ui.*;
导入java.util.List;
导入java.util.Set;
/**
*此UI是应用程序入口点。UI可以表示浏览器窗口
*(或选项卡)或嵌入Vaadin应用程序的HTML页面的某些部分。
*
*UI是使用{@link#init(VaadinRequest)}初始化的。该方法旨在:
*重写以将组件添加到用户界面并初始化非组件功能。
*/
@主题(“神话主题”)
公共类MyUI扩展了MyUI{
@凌驾
受保护的void init(VaadinRequest VaadinRequest){
//TextField仅允许“dog”或“cat”作为值。
集合动物=集合(“狗”、“猫”);
TextField dogOrCat=新TextField();
设置标题(“键入狗或猫:”);
dogOrCat.addValueChangeListener(valueChangeEvent->{
if(anists.contains(dogOrCat.getValue())){
dogOrCat.setComponentError(null);
}否则{
setComponentError(新用户错误(“哎呀!您键入的不是‘dog’或‘cat’”));
}
} );
//单选按钮对认为处于良好状态或错误状态的按钮。
按钮按钮=新按钮(“示例”);
按钮。添加ClickListener(e->{
Notification.show(“此按钮不起任何作用”,Notification.Type.HUMANIZED_MESSAGE);
} );
//单选按钮,用于控制上述按钮的良好或错误状态。
Listradiotems=List.of(“无错误”、“错误”);
RadioButtonGroup收音机=
新的RadioButtonGroup(“生成按钮:”);
无线电.设置项(放射性项);
radios.setValue(radiotems.get(0));//默认设置第一项(索引计数=0)。
radios.addValueChangeListener(valueChangeEvent->{
如果(radios.getValue().equals(radiotems.get(1)){//索引计数,那么`1`=第二个列表项“错误”。
setComponentError(新用户错误(“坏按钮”));
}否则{
button.setComponentError(null);
}
} );
//安排
最终垂直布局=新建垂直布局();
布局。添加组件(dogOrCat、按钮、收音机);
设置内容(布局);
}
@WebServlet(urlPatterns=“/*”,name=“MyUIServlet”,asyncSupported=true)
@VaadinServletConfiguration(ui=MyUI.class,productionMode=false)
公共静态类MyUIServlet扩展了VaadinServlet{
}
}
顺便说一下,这里是我的POM(POM.xml)文件,它是为Java10和各种库的最新版本更新的
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.basilbourque.example</groupId>
<artifactId>set-comp-error</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>set-comp-error</name>
<prerequisites>
<maven>3</maven>
</prerequisites>
<properties>
<vaadin.version>8.5.2</vaadin.version>
<vaadin.plugin.version>8.5.2</vaadin.plugin.version>
<jetty.plugin.version>9.4.12.v20180830</jetty.plugin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>10</maven.compiler.source>
<maven.compiler.target>10</maven.compiler.target>
<!-- If there are no local customizations, this can also be "fetch" or "cdn" -->
<vaadin.widgetset.mode>local</vaadin.widgetset.mode>
</properties>
<repositories>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
</repositories>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>${vaadin.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-server</artifactId>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-push</artifactId>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client-compiled</artifactId>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-themes</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
<!-- Exclude an unnecessary file generated by the GWT compiler. -->
<packagingExcludes>WEB-INF/classes/VAADIN/widgetsets/WEB-INF/**</packagingExcludes>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.plugin.version}</version>
<executions>
<execution>
<goals>
<goal>update-theme</goal>
<goal>update-widgetset</goal>
<goal>compile</goal>
<!-- Comment out compile-theme goal to use on-the-fly theme compilation -->
<goal>compile-theme</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
<!-- Clean up also any pre-compiled themes -->
<configuration>
<filesets>
<fileset>
<directory>src/main/webapp/VAADIN/themes</directory>
<includes>
<include>**/styles.css</include>
<include>**/styles.scss.cache</include>
</includes>
</fileset>
</filesets>
</configuration>
</plugin>
<!-- The Jetty plugin allows us to easily test the development build by
running jetty:run on the command line. -->
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty.plugin.version}</version>
<configuration>
<scanIntervalSeconds>2</scanIntervalSeconds>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<!-- Vaadin pre-release repositories -->
<id>vaadin-prerelease</id>
<activation>
<activeByDefault>false</activeByDefault>
</activation>
<repositories>
<repository>
<id>vaadin-prereleases</id>
<url>http://maven.vaadin.com/vaadin-prereleases</url>
</repository>
<repository>
<id>vaadin-snapshots</id>
<url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>vaadin-prereleases</id>
<url>http://maven.vaadin.com/vaadin-prereleases</url>
</pluginRepository>
<pluginRepository>
<id>vaadin-snapshots</id>
<url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
</profiles>
</project>
4.0.0
com.basilbourque.example
设置补偿误差
战争
1.0-快照
设置补偿误差
3.
8.5.2
8.5.2
9.4.12.v20180830
UTF-8
10
10
地方的
瓦丁插件
http://maven.vaadin.com/vaadin-addons
com.vaadin
瓦丁波姆
${vaadin.version}
聚甲醛
进口
javax.servlet
javax.servlet-api
3.1.0
假如
com.vaadin
瓦丁服务器
com.vaadin
瓦德