如果我在datatable的复选框中选择一些行并按“查看”按钮。它将在数据主义者中展示。但是在数据主义者中没有任何东西。它表明，“selectedServers”没有存储数据表中的选定行。
我需要帮助！
<?xml version='1.0' encoding='UTF-8' ?>
<!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:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.prime.com.tr/ui"
xmlns:fn="http://java.sun.com/jsp/jstl/functions">
<h:head>
<link rel="stylesheet" media="screen" href="style/style.css" />
</h:head>
<h:body>
<div id="container">
<div id="header">
<p:panel id="headerpanel">
<f:facet name="header">
<h:outputText value="cloudMon"/>
</f:facet>
</p:panel>
</div>
<div id="mainnav">
<h:form>
<p:dataTable
var="gerate"
value="#{tableBean.server}"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
paginator="true"
rows="10"
rowsPerPageTemplate="5,10,15"
emptyMessage="es gibt keine anpassende Elemente"
selection="#{tableBean.selectedServers}">
<f:facet name="header">
<p:outputPanel>
<h:outputText value="suchen:" />
<p:inputText id="globalFilter" onkeyup="carsTable.filter()" style="width: 100px" />
</p:outputPanel>
</f:facet>
<p:column selectionMode="multiple" />
<p:column sortBy="#{gerate.owner}"
headerText="gerate_owner"
filterBy="#{gerate.owner}"
filterMatchMode="contains" >
<h:outputText value="#{gerate.owner}"/>
</p:column>
<p:column sortBy="#{gerate.year}"
headerText="gerate.year"
filterBy="#{gerate.year}"
filterMatchMode="startsWith" >
<h:outputText value="#{gerate.year}"/>
</p:column>
<f:facet name="footer">
<p:commandButton value="view"
update="displayMulti"
oncomplete="multiGeraeteDialog.show()"/>
insgesamt #{fn:length(tableBean.server)} geraete
</f:facet>
</p:dataTable>
<p:dialog header="geraete anzeigen"
widgetVar="multiGeraeteDialog"
width="300" height="300"
showEffect="explode" hideEffect="explode">
ajlkdjflasjl
<p:dataList id="displayMulti"
value="#{tableBean.selectedServers}"
var="select">
aa: #{select.owner}
</p:dataList>
</p:dialog>
</h:form>
</div>
<div id="menu">
<p:panel>
<h:outputText value="Menu" />
</p:panel>
</div>
<div id="contents">
<p:panel header="Hello World">
<h:outputText value="Hello!" />
</p:panel>
</div>
<div id="footer">
<p:themeSwitcher initialText="Change Skin" buttonPreText="Skin: " />
</div>
</div>
</h:body>
</html>
package tud.cloudmon;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean(name = "tableBean")
@RequestScoped
public class TableBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 2160613756770646562L;
private final static String[] colors;
private final static String[] manufacturers;
private final static String[] owner;
static {
colors = new String[10];
colors[0] = "Black";
colors[1] = "White";
colors[2] = "Green";
colors[3] = "Red";
colors[4] = "Blue";
colors[5] = "Orange";
colors[6] = "Silver";
colors[7] = "Yellow";
colors[8] = "Brown";
colors[9] = "Maroon";
manufacturers = new String[10];
manufacturers[0] = "IBM";
manufacturers[1] = "Fujitsu";
manufacturers[2] = "BenQ";
manufacturers[3] = "Samsung";
manufacturers[4] = "Oracle";
manufacturers[5] = "HP";
manufacturers[6] = "Dell";
manufacturers[7] = "Packard Bell";
manufacturers[8] = "USRobotics";
manufacturers[9] = "Intel";
owner = new String[10];
owner[1]="Google";
owner[2]="Amazon";
owner[3]="Private";
owner[4]="Private";
owner[5]="SETI";
owner[6]="Google";
owner[7]="Google";
owner[8]="Google";
owner[9]="Amazon";
owner[0]="Amazon";
}
private List<Server> server;
private List<Server> servers;
private Server selectedServer;
private Server[] selectedServers;
public TableBean() {
server = new ArrayList<Server>();
populateRandomServer(server, 50);
}
public Server[] getSelectedServers(){
return selectedServers;
}
public void setSelectedServers(Server[] selectedServers){
this.selectedServers = selectedServers;
}
public Server getSelectedServer() {
return selectedServer;
}
public void setSelectedServer(Server selectedServer) {
this.selectedServer = selectedServer;
}
private void populateRandomServer(List<Server> list, int size) {
for(int i = 0 ; i < size ; i++)
list.add(new Server(getRandomModel(), getRandomYear(), getRandomManufacturer(), getRandomOwner()));
}
public List<Server> getServer() {
return server;
}
public List<Server> getServers(){
return servers;
}
private int getRandomYear() {
return (int) (Math.random() * 50 + 1960);
}
private String getRandomOwner() {
return owner[(int) (Math.random() * 10)];
}
private String getRandomManufacturer() {
return manufacturers[(int) (Math.random() * 10)];
}
private String getRandomModel() {
return UUID.randomUUID().toString().substring(0, 8);
}
}
答案 0 :(得分：0)
**I had the same problem. Nightmare. Thought primefaces was easy to use.
Try this:
Use 2 forms with the attribute <h:form prependId="false">
That worked for me.
Good luck**
<?xml version='1.0' encoding='UTF-8' ?>
<!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:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.prime.com.tr/ui"
xmlns:fn="http://java.sun.com/jsp/jstl/functions">
<h:head>
<link rel="stylesheet" media="screen" href="style/style.css" />
</h:head>
<h:body>
<div id="container">
<div id="header">
<p:panel id="headerpanel">
<f:facet name="header">
<h:outputText value="cloudMon"/>
</f:facet>
</p:panel>
</div>
<div id="mainnav">
<h:form prependId="false">
<p:dataTable
var="gerate"
value="#{tableBean.server}"
paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
paginator="true"
rows="10"
rowsPerPageTemplate="5,10,15"
emptyMessage="es gibt keine anpassende Elemente"
selection="#{tableBean.selectedServers}">
<f:facet name="header">
<p:outputPanel>
<h:outputText value="suchen:" />
<p:inputText id="globalFilter" onkeyup="carsTable.filter()" style="width: 100px" />
</p:outputPanel>
</f:facet>
<p:column selectionMode="multiple" />
<p:column sortBy="#{gerate.owner}"
headerText="gerate_owner"
filterBy="#{gerate.owner}"
filterMatchMode="contains" >
<h:outputText value="#{gerate.owner}"/>
</p:column>
<p:column sortBy="#{gerate.year}"
headerText="gerate.year"
filterBy="#{gerate.year}"
filterMatchMode="startsWith" >
<h:outputText value="#{gerate.year}"/>
</p:column>
<f:facet name="footer">
<p:commandButton value="view"
update="displayMulti"
oncomplete="multiGeraeteDialog.show()"/>
insgesamt #{fn:length(tableBean.server)} geraete
</f:facet>
</p:dataTable>
</h:form>
<h:form prependId="false">
<p:dialog header="geraete anzeigen"
widgetVar="multiGeraeteDialog"
width="300" height="300"
showEffect="explode" hideEffect="explode">
ajlkdjflasjl
<p:dataList id="displayMulti"
value="#{tableBean.selectedServers}"
var="select">
aa: #{select.owner}
</p:dataList>
</p:dialog>
</h:form>
</div>
<div id="menu">
<p:panel>
<h:outputText value="Menu" />
</p:panel>
</div>
<div id="contents">
<p:panel header="Hello World">
<h:outputText value="Hello!" />
</p:panel>
</div>
<div id="footer">
<p:themeSwitcher initialText="Change Skin" buttonPreText="Skin: " />
</div>
</div>
</h:body>
</html>