[英]primefaces how to retrieve changed values from picklist
我已经实现了以下选择列表:
<p:pickList id="pickList" value="#{reportConfiguratorBean.dualListVars}" var="cRVariable" itemValue="#{cRVariable}" itemLabel="#{cRVariable.varName}" converter="#{cRImageTypeConverter}" immediate="true" rendered="true" >
<f:facet name="sourceCaption">Available Variables</f:facet>
<f:facet name="targetCaption">Associated Variables</f:facet>
</p:pickList>
<f:facet name="footer">
<p:commandButton id='varassociate' action="#{reportConfiguratorBean.setAssocImTypVariables()}" value='Associate' process="@this,pickList" />
</f:facet>
选择列表已正确填充(使用数据库中的getAssocImTypVariables())。 但是我的问题是我无法捕获用户更改的选择列表值 ,从而改变了源列表和目标列表。 我正在尝试使用commandButton方法“ setAssocImTypVariables”捕获更改,如下所示:
public void setAssocImTypVariables() {
System.out.println(">>>>>>>>>>>>>>> entered");
List<CRVariable> sourceVariables = this.dualListVars.getSource();
List<CRVariable> targetVariables = this.dualListVars.getTarget();
System.out.println(dualListVars.getSource());
System.out.println(dualListVars.getTarget());
for (CRVariable sourceVariable:sourceVariables) {
System.out.println(">>>>>>>>>>>>> I am a source variable: " + sourceVariable.getVarName());
}
for (CRVariable targetVariable:targetVariables) {
System.out.println(">>>>>>>>>>>>> I am a target variable: " + targetVariable.getVarName());
}
}
因此,例如,如果我有一个INITIAL源=(Obj1,Obj2,Obj3,Obj5,Obj7)的选择列表,而目标=(Obj4,Obj6),则在控制台中将“ Obj1”从源移动到目标BUT上,我得到:
---------输入了[] []
因此,我的dualListVars(源和目标)未填充! 我有两个空的来源和目标清单...
所以我的方法无法感知选择列表的更改...有什么想法吗? 我是java + primeface的新手,所以它可能是真正的基础:(
我还附加了方法getAssocImTypesOnLoad():
public void getAssocImTypesOnLoad() {
Long imTypeId = Long.parseLong(virtualId);
List<CRVariable> source;
List<CRVariable> target;
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = null;
try
{
tx = session.beginTransaction();
String hq3 = "select distinct v from CRVariable v join v.crimagetypes t where t.id in (:itid)";
Query query3 = session.createQuery(hq3);
query3.setParameter("itid",imTypeId);
target = query3.list();
String hq4 = "select v FROM CRVariable v WHERE v.id not in (" +
"select distinct v1.id " +
"from CRVariable v1 " +
"join v1.crimagetypes t2 " +
"where t2.id in (:itid))";
Query query4 = session.createQuery(hq4);
query4.setParameter("itid",imTypeId);
source = query4.list();
dualListVars = new DualListModel<CRVariable>(source, target);
tx.commit();
}
catch (Exception e)
{
if (tx != null)
{
e.printStackTrace();
}
}
finally
{
session.close();
}
}
仔细看一下primefaces展示柜: Primefaces选择列表
直接调用dualListVars
。 #{reportConfiguratorBean.dualListVars}
解析为reportConfiguratorBean.getDualListVars()
因为dualListVars是属性(例如,具有getter和setter的属性)。
<p:pickList id="pickList" value="#{reportConfiguratorBean.dualListVars}" var="cRVariable" itemValue="#{cRVariable}" itemLabel="#{cRVariable.varName}" converter="#{cRImageTypeConverter}" immediate="true" rendered="true" >
<f:facet name="sourceCaption">Available Variables</f:facet>
<f:facet name="targetCaption">Associated Variables</f:facet>
</p:pickList>
action属性用于业务逻辑。 您可以在此处捕获源和目标列表。 process属性告诉JSF要处理哪些组件。 在您的情况下,您希望处理组件picklist
和commandButton
。 您也可以使用process="@form"
处理整个表单。
<p:commandButton id='varassociate' action="#{reportConfiguratorBean.readMyAssocImTypVariables}" value='Associate' ajax='false' process="@this,pickList" immediate="true" />
readMyAssocImTypVariables函数:
public void readMyAssocImTypVariables() {
List<CRVariable> sourceVariables = this.dualListVars.getSource();
List<CRVariable> targetVariables = this.dualListVars.getTarget();
for (CRVariable sourceVariable:sourceVariables) {
System.out.println(">>>>>>>>>>>>> I am a source variable: " + sourceVariable.getVarName());
}
for (CRVariable targetVariable:targetVariables) {
System.out.println(">>>>>>>>>>>>> I am a target variable: " + targetVariable.getVarName());
}
}
无关的 :不要将业务逻辑放入getter / setter中! JSF将它们多次调用。
运行中的选择列表示例picklist.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:ui="http://java.sun.com/jsf/facelets">
<h:head></h:head>
<h:body>
<h:form>
<h3>Basic PickList</h3>
<p:pickList value="#{pickListBean.cities}" var="city"
itemLabel="#{city}" itemValue="#{city}" />
<p:commandButton value="Submit" action="#{pickListBean.displayList}" />
</h:form>
</h:body>
</html>
PickListBean.java
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import org.primefaces.model.DualListModel;
@ManagedBean
public class PickListBean {
private DualListModel<String> cities;
public PickListBean() {
//Cities
List<String> citiesSource = new ArrayList<String>();
List<String> citiesTarget = new ArrayList<String>();
citiesSource.add("Istanbul");
citiesSource.add("Ankara");
citiesSource.add("Izmir");
citiesSource.add("Antalya");
citiesSource.add("Bursa");
// citiesTarget.add("T1");
cities = new DualListModel<String>(citiesSource, citiesTarget);
}
public DualListModel<String> getCities() {
return cities;
}
public void setCities(DualListModel<String> cities) {
this.cities = cities;
}
public void displayList(){
System.out.println("values in list are" +cities.getTarget());
}
}
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