primefaces cascade selectonemenu

Question

我有3个下拉菜单，第二个必须根据第一个选定的选项加载。第三个基于第二个选定的选项。 这是网页：

<h:panelGrid columns="2" cellpadding="5"> 
    <p:outputLabel value="Empresa:" for="selectCompany" /> 
    <p:selectOneMenu id="selectCompany" value="#{dropdownBean.company}" 
     converter="entityConverter" effect="fade" effectSpeed="200" 
     var="company"> 

     <p:ajax process="@this" event="change" 
      update="selectBranch, selectVendor" /> 

     <f:selectItems value="#{dropdownBean.companies}" var="companyItem" 
      itemLabel="#{companyItem.corporateName}" itemValue="#{companyItem}" /> 
     <p:column> 
      <h:outputText value="#{company.corporateName}" /> 
     </p:column> 
    </p:selectOneMenu> 
</h:panelGrid> 

<h:panelGrid columns="2" cellpadding="5"> 
    <p:outputLabel value="Surcursal:" for="#selectBranch" /> 
    <p:selectOneMenu id="#selectBranch" value="#{dropdownBean.branch}" 
     converter="entityConverter" effect="fade" effectSpeed="200" 
     var="branch"> 

    <p:ajax process="@this" event="change" update="#selectVendor" /> 

     <f:selectItem itemLabel="SELECCIONE SUCURSAL" itemValue="" 
      noSelectionOption="true" /> 
     <f:selectItems value="#{dropdownBean.branches}" var="branchItem" 
      itemLabel="#{branchItem.branchName}" itemValue="#{branchItem}" /> 
     <p:column> 
      <h:outputText value="#{branch.branchName}" /> 
     </p:column> 
    </p:selectOneMenu> 
</h:panelGrid> 
<h:panelGrid columns="2" cellpadding="5"> 
    <p:outputLabel value="Vendedor: " for="#selectVendor" /> 
    <p:selectOneMenu id="#selectVendor" value="#{dropdownBean.vendor}" 
     converter="entityConverter" effect="fade" effectSpeed="200" 
     var="vendor"> 
     <f:selectItem itemLabel="SELECCIONE VENDEDOR" itemValue="" 
      noSelectionOption="true" /> 
     <f:selectItems value="#{dropdownBean.vendors}" var="vendorItem" 
      itemLabel="#{vendorItem.vendorName}" itemValue="#{vendorItem}" /> 
     <p:column> 
      <h:outputText value="#{vendor.vendorName}" /> 
     </p:column> 
    </p:selectOneMenu> 
</h:panelGrid> 

而且backbean：

@ManagedBean 
public class DropdownBean { 
@Inject 
private CompanyBC companyBC; 
@Inject 
private BranchBC branchBC; 
@Inject 
private VendorBC vendorBC; 

private V_Companies company; 
private V_Branches branch; 
private V_Vendors vendor; 

private List<V_Companies> companies; 
private List<V_Branches> branches; 
private List<V_Vendors> vendors; 

@PostConstruct 
public void allCompanies() { 
    companies = companyBC.allCompanies(); 
} 

public List<V_Companies> getCompanies() { 
    return companies; 
} 

public void setCompanies(List<V_Companies> companies) { 
    this.companies = companies; 
} 

public List<V_Branches> getBranches() { 
    if(company!=null) 
     branches = branchBC.allCompanyBranches(company.getCompanyId()); 
    return branches; 
} 

public void setBranches(List<V_Branches> branches) { 
    this.branches = branches; 
} 

public List<V_Vendors> getVendors() { 
    if(company!=null && branch!=null) 
     vendors = vendorBC.allBranchVendors(company.getCompanyId(), branch.getBranchId()); 
    return vendors; 
} 

public void setVendors(List<V_Vendors> vendors) { 
    this.vendors = vendors; 
} 

public V_Companies getCompany() { 
    return company; 
} 

public void setCompany(V_Companies company) { 
    this.company = company; 
} 

public V_Branches getBranch() { 
    return branch; 
} 

public void setBranch(V_Branches branch) { 
    this.branch = branch; 
} 

public V_Vendors getVendor() { 
    return vendor; 
} 

public void setVendor(V_Vendors vendor) { 
    this.vendor = vendor; 
} 

}

前两个下拉列表的工作很好，但最后一个没有。显然不能超过一个p：ajax为同一事件或类似的东西。有什么建议吗？

Answer 1

添加监听工作：

<p:ajax process="@this" listener="#{userEditMB.onBranchChange}" event="change" update="selectVendor" /> 


public void onBranchChange(AjaxBehaviorEvent event) { 

    setBranch((V_Branches) ((UIOutput) event.getSource()).getValue()); 

    vendors = vendorBC.allBranchVendors(getBranch().getCompanyId(), 
      getBranch().getBranchId()); 
} 

我尝试过，但听者传递的Id作为参数。传递AjaxBehaviorEvent并将其转换为对象是我的答案。我希望能帮助别人 谢谢！