Validation 如何验证primefaces树<；p:tree>；
primefacesValidation 如何验证primefaces树<；p:tree>；,validation,jsf-2,primefaces,treeview,Validation,Jsf 2,Primefaces,Treeview,primefaces似乎不是EditableValueHolder，即使它提供了使树可选择的功能。在我看来，这似乎就是EditableValueHolder的定义，因为它既保存值（选定的节点列表），又可编辑（您可以更改选择）。在使树可选择的过程中，它基本上将其转换为selectOneXxx/selectManyXxx。这就是我使用这个小部件的方式。但是，我不是EditableValueHolder，无法直接将验证器附加到它。我可以使用actionListener将验证添加到表单提交操作中，但随后
EditableValueHolderactionListenerUITree<h:panelGroup id="pnpCois" styleClass="pnp-input-group pnp-cois">
<h:outputLabel for="inputCois"
value="#{i18n['communities-of-interest']}" />
<p:tree id="inputCois"
value="#{subscriptions.selected.coiTreeRootNode}" var="node"
selectionMode="checkbox"
selection="#{subscriptions.selected.selectedCoiNodes}">
<p:ajax event="select" process="@this :#{component.clientId}_validator" update="@this"
onstart="$('##{component.clientId}_validator'.replace(':','\\:')).val($('##{component.clientId}_selection'.replace(':','\\:')).val());" />
<p:ajax event="unselect" process="@this :#{component.clientId}_validator" update="@this"
onstart="$('##{component.clientId}_validator'.replace(':','\\:')).val($('##{component.clientId}_selection'.replace(':','\\:')).val());" />
<p:treeNode>
<h:outputText value="#{node}" />
</p:treeNode>
</p:tree>
<h:inputHidden id="inputCois_validator">
<f:converter converterId="asias.stringCsvToArray" />
<f:validator validatorId="asias.atLeastOneSelected" />
<f:attribute name="atLeastOneSelectedMessage"
value="#{i18n['at-least-one-coi-must-be-selected']}" />
</h:inputHidden>
</h:panelGroup>
在与BalusC讨论了一些建议之后，我想我将放弃
selections
...
'ok'必需的验证程序。请相信我，这是一个很长的答案
由于primefaces树不是一个EditableValueHolder
，因此在JSF生命周期的标准流程验证阶段无法对其进行验证（如果没有一些重大的黑客攻击）。并且尽我所能，我无法修补primefaces树代码，使其成为EditableValueHolder
（树不会根据选定的值进行渲染，而是根据支持树的节点的状态进行渲染）。考虑到这些约束，唯一的解决方案是创建我自己的树组件（我没有时间）、使用其他组件（树最适合）或在调用应用程序阶段进行验证
我选择了第三种解决方案，并在这样做的过程中，尝试使其尽可能类似于常规验证。主要思想是，使用一个首先被触发的actionListener
（在任何其他actionListener
s或主操作之前）（保存表单）处理验证。如果验证失败，我将在自定义属性中向组件添加有关失败的信息，调用facesContext.validationFailed（）
因此，我可以跳过该操作，然后添加一个preRenderView
系统事件侦听器，以便在渲染响应阶段之前根据组件的验证状态修改组件。这样做的方式允许您仍然使用自定义组件而不是
以相同的方式指定验证。下面是e代码：
web.xml：
...
<context-param>
<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
<param-value>/WEB-INF/somenamespace.taglib.xml</param-value>
</context-param>
...
。。。
javax.faces.FACELETS\u库
/WEB-INF/somenamespace.taglib.xml
...
somenamespace.taglib.xml：
<facelet-taglib version="2.0" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd">
<namespace>http://ns.my.com/ui/extensions</namespace>
<tag>
<description><![CDATA[
Add an actionListener validator to a component
]]></description>
<tag-name>actionListenerValidator</tag-name>
<handler-class>com.my.ns.actionlistenervalidator.ActionListenerValidatorHandler</handler-class>
<attribute>
<description><![CDATA[
The validatorId.
]]></description>
<name>validatorId</name>
<type>java.lang.String</type>
</attribute>
<attribute>
<description><![CDATA[
A ValueExpression that evaluates to an instance of Validator.
]]></description>
<name>binding</name>
<type>javax.el.ValueExpression</type>
</attribute>
<attribute>
<description><![CDATA[
The styleClass added to the end of the component style class when a validation error occurs
]]></description>
<name>errorStyleClass</name>
<type>java.lang.String</type>
</attribute>
</tag>
</facelet-taglib>
http://ns.my.com/ui/extensions
神经标定器
com.my.ns.actionListenrvalidator.actionListenrvalidatorHandler
验证器ID
java.lang.String
结合
javax.el.ValueExpression
errorStyleClass
java.lang.String
ActionListenerHandler.java：
package com.my.ns.actionlistenervalidator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagAttributes;
import javax.faces.view.facelets.TagConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.sun.faces.facelets.tag.TagHandlerImpl;
public class ActionListenerValidatorHandler extends TagHandlerImpl {
private static Logger logger = LoggerFactory.getLogger( ActionListenerValidatorHandler.class );
public static enum AttributeKeys {
errorStyleClass("hack.jsf.actionlistenervalidator.errorStyleClass"),
messages("hack.jsf.actionlistenervalidator.messages"),
valid("hack.jsf.actionlistenervalidator.valid"),
validators("hack.jsf.actionlistenervalidator.validators");
private String key;
private AttributeKeys( String key ) {
this.key = key;
}
public String getKey() {
return key;
}
}
public ActionListenerValidatorHandler( TagConfig config ) {
super( config );
}
@Override
public void apply( FaceletContext ctx, UIComponent parent ) throws IOException {
ActionListenerValidatorWrapper validator = new ActionListenerValidatorWrapper( ctx.getFacesContext(),
tagAttributesToMap( ctx, this.tag.getAttributes() ) );
logger.trace( "adding actionListener validator {} to {}", validator, parent );
@SuppressWarnings( "unchecked" )
List<ActionListenerValidatorWrapper> validators = (List<ActionListenerValidatorWrapper>) parent.getAttributes().get( AttributeKeys.validators.getKey() );
if ( validators == null ) {
validators = new ArrayList<ActionListenerValidatorWrapper>();
parent.getAttributes().put( AttributeKeys.validators.getKey(), validators );
}
validators.add( validator );
}
private Map<String, Object> tagAttributesToMap( FaceletContext ctx, TagAttributes tagAttributes ) {
Map<String, Object> map = new HashMap<String, Object>();
for ( TagAttribute attribute : tagAttributes.getAll() ) {
map.put( attribute.getLocalName(), attribute.getValue( ctx ) );
}
return map;
}
}
package com.my.ns.actionListenrvalidator；
导入java.io.IOException；
导入java.util.ArrayList；
导入java.util.HashMap；
导入java.util.List；
导入java.util.Map；
导入javax.faces.component.UIComponent；
导入javax.faces.view.facelets.FaceletContext；
导入javax.faces.view.facelets.TagAttribute；
导入javax.faces.view.facelets.TagAttributes；
导入javax.faces.view.facelets.TagConfig；
导入org.slf4j.Logger；
导入org.slf4j.LoggerFactory；
导入com.sun.faces.facelets.tag.TagHandlerImpl；
公共类ActionListenerValidatorHandler扩展了TagHandlerImpl{
私有静态记录器Logger=LoggerFactory.getLogger（actionListenrvalidatorHandler.class）；
公共静态枚举属性{
errorStyleClass（“hack.jsf.actionlistenervalidator.errorStyleClass”），
消息（“hack.jsf.actionlistenervalidator.messages”），
valid（“hack.jsf.actionlistenervalidator.valid”），
验证器（“hack.jsf.actionListenrvalidator.validators”）；
私钥；
私有属性键（字符串键）{
this.key=key；
}
公共字符串getKey（）{
返回键；
}
}
公共操作ListenrvalidatorHandler（TagConfig配置）{
超级（配置）；
}
@凌驾
public void apply（FaceletContext ctx，UIComponent父级）引发IOException{
ActionListenrvalidatorWrapper validator=新的ActionListenrvalidatorWrapper（ctx.getFacesContext（），
tagAttributesToMap（ctx，this.tag.getAttributes（））；
trace（“将actionListener验证程序{}添加到{}”，验证程序，父级）；
@抑制警告（“未选中”）
List validators=（List）parent.getAttributes（）.get（AttributeKeys.validators.getKey（））；
if（验证器==null）{
验证器=新的
package com.my.ns.actionlistenervalidator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagAttributes;
import javax.faces.view.facelets.TagConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.sun.faces.facelets.tag.TagHandlerImpl;
public class ActionListenerValidatorHandler extends TagHandlerImpl {
private static Logger logger = LoggerFactory.getLogger( ActionListenerValidatorHandler.class );
public static enum AttributeKeys {
errorStyleClass("hack.jsf.actionlistenervalidator.errorStyleClass"),
messages("hack.jsf.actionlistenervalidator.messages"),
valid("hack.jsf.actionlistenervalidator.valid"),
validators("hack.jsf.actionlistenervalidator.validators");
private String key;
private AttributeKeys( String key ) {
this.key = key;
}
public String getKey() {
return key;
}
}
public ActionListenerValidatorHandler( TagConfig config ) {
super( config );
}
@Override
public void apply( FaceletContext ctx, UIComponent parent ) throws IOException {
ActionListenerValidatorWrapper validator = new ActionListenerValidatorWrapper( ctx.getFacesContext(),
tagAttributesToMap( ctx, this.tag.getAttributes() ) );
logger.trace( "adding actionListener validator {} to {}", validator, parent );
@SuppressWarnings( "unchecked" )
List<ActionListenerValidatorWrapper> validators = (List<ActionListenerValidatorWrapper>) parent.getAttributes().get( AttributeKeys.validators.getKey() );
if ( validators == null ) {
validators = new ArrayList<ActionListenerValidatorWrapper>();
parent.getAttributes().put( AttributeKeys.validators.getKey(), validators );
}
validators.add( validator );
}
private Map<String, Object> tagAttributesToMap( FaceletContext ctx, TagAttributes tagAttributes ) {
Map<String, Object> map = new HashMap<String, Object>();
for ( TagAttribute attribute : tagAttributes.getAll() ) {
map.put( attribute.getLocalName(), attribute.getValue( ctx ) );
}
return map;
}
}
package com.my.ns.actionlistenervalidator;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import javax.faces.view.facelets.FaceletException;
import com.sun.faces.el.ELUtils;
public class ActionListenerValidatorWrapper {
private Validator validator;
private String errorStyleClass;
public ActionListenerValidatorWrapper( FacesContext context, Map<String, Object> attributes ) {
String binding = (String) attributes.get( "binding" );
String validatorId = (String) attributes.get( "validatorId" );
if ( binding != null ) {
ExpressionFactory factory = context.getApplication().getExpressionFactory();
ELContext elContext = context.getELContext();
ValueExpression valueExpression = factory.createValueExpression(
elContext, binding, String.class );
this.validator = (Validator) ELUtils.evaluateValueExpression( valueExpression, context.getELContext() );
}
else if ( validatorId != null ) {
this.validator = context.getApplication().createValidator( validatorId );
this.errorStyleClass = (String) attributes.get( "errorStyleClass" );
// inject all attributes
for ( Method method : validator.getClass().getMethods() ) {
String methodName = method.getName();
Class<?>[] types = method.getParameterTypes();
if ( methodName.startsWith( "set" ) && types.length == 1 ) {
String property = Character.toLowerCase( methodName.charAt( 3 ) ) + methodName.substring( 4 );
if ( attributes.containsKey( property ) ) {
// convert value type
Object value = null;
if ( types[0] == Integer.TYPE ) {
value = intValue( context, attributes.get( property ) );
}
else {
value = attributes.get( property );
}
// call setter
try {
method.invoke( validator, value );
}
catch ( IllegalArgumentException e ) {
throw new FaceletException( e );
}
catch ( IllegalAccessException e ) {
throw new FaceletException( e );
}
catch ( InvocationTargetException e ) {
throw new FaceletException( e );
}
}
}
}
}
else {
throw new FaceletException( "ActionListenerValidator requires either validatorId or binding" );
}
}
@Override
public boolean equals( Object otherObj ) {
if ( !(otherObj instanceof ActionListenerValidatorWrapper) ) {
return false;
}
ActionListenerValidatorWrapper other = (ActionListenerValidatorWrapper) otherObj;
return (this.getValidator().equals( other.getValidator() ))
&& (this.getErrorStyleClass().equals( other.getErrorStyleClass() ));
}
public String getErrorStyleClass() {
return errorStyleClass;
}
public Validator getValidator() {
return validator;
}
@Override
public int hashCode() {
int hashCode = (getValidator().hashCode()
+ getErrorStyleClass().hashCode());
return (hashCode);
}
private Integer intValue( FacesContext context, Object value ) {
ExpressionFactory factory = context.getApplication().getExpressionFactory();
ELContext elContext = context.getELContext();
ValueExpression valueExpression = factory.createValueExpression(
elContext, value.toString(), String.class );
if ( !valueExpression.isLiteralText() ) {
return ((Number) ELUtils.evaluateValueExpression( valueExpression, elContext )).intValue();
}
else {
return Integer.valueOf( valueExpression.getExpressionString() );
}
}
@Override
public String toString() {
return validator.getClass().getName();
}
public void validate( FacesContext context, UIComponent component, Object value ) throws ValidatorException {
validator.validate( context, component, value );
}
}
package com.my.ns.actionlistenervalidator;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.ViewScoped;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.event.ComponentSystemEvent;
import javax.faces.validator.ValidatorException;
import com.my.ns.controller.MyBean;
import com.my.ns.actionlistenervalidator.ActionListenerValidatorHandler.AttributeKeys;
import org.primefaces.component.tree.Tree;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ManagedBean
@ViewScoped
public class ActionListenerValidatorManager implements Serializable {
private static final long serialVersionUID = -696487579396819893L;
private static Logger logger = LoggerFactory.getLogger( ActionListenerValidatorManager.class );
@ManagedProperty( "#{myBean}" )
private MyBean myBean;
private void addValidationToComponent( Map<String, Object> attributes, Collection<FacesMessage> facesMessages, Set<String> errorStyleClasses ) {
attributes.put( AttributeKeys.valid.getKey(), false );
attributes.put( AttributeKeys.messages.getKey(), facesMessages );
StringBuilder builder = new StringBuilder();
if ( errorStyleClasses != null ) {
for ( String styleClass : errorStyleClasses ) {
builder.append( styleClass );
}
attributes.put( AttributeKeys.errorStyleClass.getKey(), builder.toString() );
}
}
public void applyValidationStateToComponentTreeBecausePrimefacesDidntMakeTreeAnEditableValueHolder( ComponentSystemEvent event ) {
applyValidationStateToComponentTree( FacesContext.getCurrentInstance() );
}
private void applyValidationStateToComponentTree( FacesContext context ) {
UIViewRoot viewRoot = context.getViewRoot();
logger.trace( "pre render view for {}", viewRoot );
viewRoot.visitTree( VisitContext.createVisitContext( context ),
new VisitCallback() {
@Override
public VisitResult visit( VisitContext context, UIComponent component ) {
Map<String, Object> attributes = component.getAttributes();
if ( attributes.containsKey( AttributeKeys.valid.getKey() ) &&
!((Boolean) attributes.get( AttributeKeys.valid.getKey() )) ) {
// validation state
if ( component instanceof EditableValueHolder ) {
((EditableValueHolder) component).setValid( false );
}
// validation messages
FacesContext facesContext = context.getFacesContext();
@SuppressWarnings( "unchecked" )
List<FacesMessage> messages = (List<FacesMessage>) attributes.get( AttributeKeys.messages.getKey() );
if ( messages != null ) {
for ( FacesMessage message : messages ) {
facesContext.addMessage( component.getClientId(), message );
}
}
// style class
String errorStyleClass = (String) attributes.get( AttributeKeys.errorStyleClass.getKey() );
if ( errorStyleClass != null ) {
String styleClass = (String) attributes.get( "styleClass" );
styleClass = styleClass == null ? errorStyleClass : styleClass + " " + errorStyleClass;
attributes.put( "styleClass", styleClass );
}
}
return VisitResult.ACCEPT;
}
} );
}
private void clearValidationFromTree( FacesContext context, UIComponent component ) {
component.visitTree( VisitContext.createVisitContext( context ),
new VisitCallback() {
@Override
public VisitResult visit( VisitContext context, UIComponent target ) {
clearValidationFromComponent( target.getAttributes() );
return VisitResult.ACCEPT;
}
} );
}
private void clearValidationFromComponent( Map<String, Object> attributes ) {
if ( attributes.containsKey( AttributeKeys.validators.getKey() ) ) {
String errorStyleClass = (String) attributes.get( AttributeKeys.errorStyleClass.getKey() );
if ( errorStyleClass != null ) {
String styleClass = (String) attributes.get( "styleClass" );
styleClass = styleClass.replace( errorStyleClass, "" );
attributes.put( "styleClass", styleClass );
}
attributes.remove( AttributeKeys.valid.getKey() );
attributes.remove( AttributeKeys.messages.getKey() );
attributes.remove( AttributeKeys.errorStyleClass.getKey() );
}
}
private Object getValue( FacesContext facesContext, UIComponent component ) {
Object value = null;
if ( component instanceof EditableValueHolder ) {
value = ((EditableValueHolder) component).getValue();
}
else if ( component instanceof Tree ) {
value = myBean.getSelectedIds();
}
return value;
}
public void setMyBean( MyBean myBean ) {
this.myBean = myBean;
}
private void validate( FacesContext context ) {
logger.trace( "entering validation" );
final List<String> validationFailed = new ArrayList<String>();
UIViewRoot viewRoot = context.getViewRoot();
viewRoot.visitTree( VisitContext.createVisitContext( context ),
new VisitCallback() {
@Override
public VisitResult visit( VisitContext context, UIComponent component ) {
if ( !component.isRendered() ) {
// remove all validation from subtree as validation
// is not performed unless the component is
// rendered.
clearValidationFromTree( context.getFacesContext(), component );
return VisitResult.REJECT;
}
Map<String, Object> attributes = component.getAttributes();
if ( attributes.containsKey( AttributeKeys.validators.getKey() ) ) {
Object value = getValue( context.getFacesContext(), component );
boolean valid = true;
Collection<FacesMessage> facesMessages = null;
Set<String> errorStyleClasses = null;
@SuppressWarnings( "unchecked" )
List<ActionListenerValidatorWrapper> validators =
(List<ActionListenerValidatorWrapper>) attributes.get( AttributeKeys.validators.getKey() );
for ( ActionListenerValidatorWrapper validator : validators ) {
try {
validator.validate( context.getFacesContext(), component, value );
}
catch ( ValidatorException validatorException ) {
valid = false;
Collection<FacesMessage> innerMessages = validatorException.getFacesMessages();
if ( innerMessages == null ) {
FacesMessage innerMessage = validatorException.getFacesMessage();
if ( innerMessage != null ) {
innerMessages = Arrays.asList( new FacesMessage[] { innerMessage } );
}
}
if ( facesMessages == null ) {
facesMessages = new ArrayList<FacesMessage>();
}
facesMessages.addAll( innerMessages );
String errorStyleClass = validator.getErrorStyleClass();
if ( errorStyleClass != null ) {
if ( errorStyleClasses == null ) {
errorStyleClasses = new TreeSet<String>();
}
errorStyleClasses.add( errorStyleClass );
}
}
}
if ( valid ) {
// remove previous validation state
clearValidationFromComponent( attributes );
}
else {
// add validation state
addValidationToComponent( attributes, facesMessages, errorStyleClasses );
validationFailed.add( "Yes, it did, but cant update final boolean so we use a list" );
}
}
return VisitResult.ACCEPT;
}
} );
if ( validationFailed.size() > 0 ) {
context.validationFailed();
}
}
public void validateThisFormBecausePrimefacesDidntMakeTreeAnEditableValueHolder( ActionEvent event ) {
validate( FacesContext.getCurrentInstance() );
}
}
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html"
xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:p="http://primefaces.org/ui"
xmlns:fn="http://java.sun.com/jsp/jstl/functions"
xmlns:myns="http://ns.my.com/ui/extensions">
<h:head />
<h:body>
<f:event type="preRenderView"
listener="#{actionListenerValidatorManager.applyValidationStateToComponentTreeBecausePrimefacesDidntMakeTreeAnEditableValueHolder}" />
...
<h:panelGroup id="treeGroup">
<h:outputLabel for="treeInput"
value="#{i18n['my-tree']}" />
<p:tree id="treeInput"
value="#{myBean.treeRootNode}" var="node"
selectionMode="checkbox"
selection="#{myBean.selectedNodes}">
<pe:actionListenerValidator
validatorId="javax.faces.Required"
errorStyleClass="ui-state-error" />
<p:treeNode>
<h:outputText value="#{node}" />
</p:treeNode>
</p:tree>
</h:panelGroup>
...
</h:body>
</html>