问题
I am working on a project using Primefaces 3.5 & JSF2.1 (Mojarra)
I have created a primefaces <p:tabView id="tabsVw" dynamic="false"> with two tabs inside and each tab has a primefaces datatable
<h:form>
<p:tabView dynamic="false">
<p:ajax event="tabChange" listener="#{tstTab.onDtlTabChanged}" />
<p:tab title="tab1">
<p:dataTable value="#{tstTab.list1}" var="v1">
<p:column>
<h:outputText value="#{v1}"/>
</p:column>
</p:dataTable>
</p:tab>
<p:tab title="tab2">
<p:dataTable value="#{tstTab.list2}" var="v2">
<p:column>
<h:outputText value="#{v2}"/>
</p:column>
</p:dataTable>
</p:tab>
</p:tabView>
</h:form>
and inside the bean (view scoped)
@ManagedBean
@ViewScoped
public class TstTab {
private List<String> list1;
private List<String> list2;
public TstTab(){
list1 = new ArrayList<String>();
list2 = new ArrayList<String>();
list1.add("List 1 - Str 1");
list1.add("List 1 - Str 2");
list1.add("List 1 - Str 3");
list1.add("List 1 - Str 4");
list1.add("List 1 - Str 5");
list2.add("List 2 - Str 1");
list2.add("List 2 - Str 2");
list2.add("List 2 - Str 3");
list2.add("List 2 - Str 4");
list2.add("List 2 - Str 5");
}
public void onDtlTabChanged(TabChangeEvent event) {
System.out.println("000000000000000000");
}
public List<String> getList1() {
System.out.println("11111111111111");
return list1;
}
public List<String> getList2() {
System.out.println("222222222222222222");
return list2;
}
}
now the problem is when run the application and try to navigate (change) between tabs, but I can see that the onDtlTabChanged is called after calling getters, so that is a big problem.
and if change the tabView from static to dynamic, then the behavior is random, in other words the calling to the change event is happening somewhere in the middle of getters.
Thank you in advance.
回答1:
Well I think that its a primefaces BUG, I found a workaround which as the following
Do not use a global form (form for the tabView itself) instead use a form for each tab (inside it that surround the datatable)
You have to add a dummy tab to be the first one that must include a form which some static data or pre-loaded data inside
Thats all,
the problem was that the ajax request is inside the global form and it cause the datatables to get their data first before ajax request, the strange thing with Primefaces that if you do not add the first dummy tab it will always execute the first form inside the tabs and get its data and this will cause a problem
regards ,
回答2:
I think the answer of ali saleh is right.
If you get problems with the tabchangelistener perhaps this can help you:
I had a similar problem with Primefaces 5.1
As long as i put the tabview into a form everything worked fine. But because i wanted to use seperate forms in my tabs i had to remove the surrounding form of the tabview to avoid nested forms. Without the surrounding form the ajax event didn´t get triggered any more when changing the tab.
My solution was to use a remotecommand in a form parallel to the tabview.
The remotecommand is triggered by the onTabChange attribute of the tabview element.
At that call i forwarded the index parameter to the global request parameters.
<p:tabView id="rootTabMenu" styleClass="tabcontainer" prependId="false"
activeIndex="#{sessionData.activeTabIndex}" widgetVar="rootTabMenu"
onTabChange="tabChangeHelper([{name: 'activeIndex', value: index}])">
// Tabs...
</p:tabView>
<h:form id="tabChangeHelperForm">
<p:remoteCommand name="tabChangeHelper" actionListener="#{sessionData.onTabChange()}" />
</h:form>
In the backing bean i catched the value again from the request parameter map and set the active index.
public void onTabChange()
{
FacesContext context = FacesContext.getCurrentInstance();
Map<String, String> paramMap = context.getExternalContext().getRequestParameterMap();
String paramIndex = paramMap.get("activeIndex");
setActiveTabIndex(Integer.valueOf(paramIndex));
System.out.println("Active index changed to " + activeTabIndex);
}
Hope that can help you
回答3:
It work fine in Primefaces 3.5 and mojarra 2.1.20, my code: bean:
@ManagedBean(name = "tabview")
@ViewScoped
public class TabView implements Serializable {
private static final long serialVersionUID = 1L;
private List<Car> l1;
private List<Car> l2;
private List<Car> l3;
public TabView() {
l1 = new ArrayList<Car>();
l2 = new ArrayList<Car>();
l3 = new ArrayList<Car>();
Car c1 = new Car("c1", "a1");
Car c2 = new Car("c21", "a21");
Car c3 = new Car("c31", "a31");
Car c4 = new Car("c41", "a41");
Car c5 = new Car("c51", "a51");
Car c6 = new Car("c61", "a61");
Car c7 = new Car("c71", "a71");
Car c8 = new Car("c81", "a81");
Car c9 = new Car("c91", "a91");
l1.add(c1);
l1.add(c2);
l1.add(c3);
l2.add(c4);
l2.add(c5);
l2.add(c6);
l3.add(c7);
l3.add(c8);
l3.add(c9);
}
public void hand(TabChangeEvent event) {
Car c1 = new Car("c1", "a1");
Car c2 = new Car("c1", "a1");
Car c3 = new Car("c1", "a1");
Car c4 = new Car("c1", "a1");
Car c5 = new Car("c1", "a1");
Car c6 = new Car("c1", "a1");
Car c7 = new Car("c1", "a1");
Car c8 = new Car("c1", "a1");
Car c9 = new Car("c1", "a1");
l1.add(c1);
l1.add(c2);
l1.add(c3);
l2.add(c4);
l2.add(c5);
l2.add(c6);
l3.add(c7);
l3.add(c8);
l3.add(c9);
}
public List<Car> getL1() {
return l1;
}
public void setL1(List<Car> l1) {
this.l1 = l1;
}
public List<Car> getL2() {
return l2;
}
public void setL2(List<Car> l2) {
this.l2 = l2;
}
public List<Car> getL3() {
return l3;
}
public void setL3(List<Car> l3) {
this.l3 = l3;
}
}
xhtml:
<p:tabView id="mtrlDtlTabs" dynamic="true" cache="false">
<p:ajax event="tabChange" update="t1 t2 t3" listener="#{tabview.hand}"/>
<p:tab id="t1" title="1">
<p:dataTable id="l1" value="#{tabview.l1}" var="l1">
<p:column headerText="l1">#{l1.manufacturer}</p:column>
<p:column headerText="l2">#{l1.model}</p:column>
</p:dataTable>
</p:tab>
<p:tab id="t2" title="2">
<p:dataTable id="l2" value="#{tabview.l2}" var="l2">
<p:column headerText="l2">#{l2.manufacturer}</p:column>
<p:column headerText="l22">#{l2.model}</p:column>
</p:dataTable>
</p:tab>
<p:tab id="t3" title="3">
<p:dataTable id="l3" value="#{tabview.l3}" var="l3">
<p:column headerText="l3">#{l3.manufacturer}</p:column>
<p:column headerText="l33">#{l3.model}</p:column>
</p:dataTable>
</p:tab>
</p:tabView>
来源：https://stackoverflow.com/questions/15930138/primefaces-tabview-tabchange-event-fired-after-displaying-tab