基於選定的selectOneMenu項目啓用jsf組件

我正在使用jsf/primefaces。如果用戶從「addCountry」selectOneMenu中選擇「澳大利亞」，我想啓用'addState'selectOneMenu下拉菜單，但它起作用，但在首次啓用之前必須先更改國家幾次，之後啓用/禁用每次更改。如何讓它在第一次變更後作出迴應？基於選定的selectOneMenu項目啓用jsf組件

<h:outputLabel value="#{bundle.AddressLabel_country}" for="addcountry" /> 
    <p:selectOneMenu id="addcountry" value="#{addressBean.address.country}" immediate="true" > 
     <f:selectItems value="#{localeList.getCountryList()}" /> 
     <f:ajax render="addstate"/> 
    </p:selectOneMenu> 

    <h:outputLabel value="#{bundle.AddressLabel_state}" for="addstate"/> 
    <p:selectOneMenu id="addstate" value="#{addressBean.address.state}" disabled="#{addressBean.address.country ne 'Australia'}"> 
     <f:selectItem itemLabel="Select State" itemValue="" /> 
     <f:selectItems value="#{localeList.getAUState()}" /> 
    </p:selectOneMenu>

來源

2014-01-22 Ectomorph

怎麼這樣

import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 

import javax.annotation.PostConstruct; 
import javax.faces.bean.ManagedBean; 
import javax.faces.bean.ViewScoped; 

@ManagedBean 
@ViewScoped 
public class AddressBean implements Serializable{ 

    /** 
    * 
    */ 
    private static final long serialVersionUID = 2439322307625952605L; 

    private List<String> countries; 
    private List<String> states; 
    private Address address; 
    private boolean disableState; 
    private Map<String,List<String>> map = new HashMap<String,List<String>>(); 

    @PostConstruct 
    public void init(){ 
     address= new Address(); 
     countries = new ArrayList<String>(); 
     states = new ArrayList<String>(); 

     countries.add("Australia"); 
     countries.add("Other"); 

     String[] s1 = {"state 1","state 2"}; 
     String[] s2 = {"state 3","state 4"}; 
     map.put("Australia", Arrays.asList(s1)); 
     map.put("Other", Arrays.asList(s2)); 

     this.disableState = "Australia".equals(countries.get(0)); 
    } 

    public void updateState(){ 
     this.states = map.get(this.address.getCountry()); 
     this.disableState = "Australia".equals(this.address.getCountry()); 
    } 

    public List<String> getCountries() { 
     return countries; 
    } 

    public void setCountries(List<String> countries) { 
     this.countries = countries; 
    } 

    public List<String> getStates() { 
     return states; 
    } 

    public void setStates(List<String> states) { 
     this.states = states; 
    } 

    public Address getAddress() { 
     return address; 
    } 

    public void setAddress(Address address) { 
     this.address = address; 
    } 

    public boolean isDisableState() { 
     return disableState; 
    } 

    public void setDisableState(boolean disableState) { 
     this.disableState = disableState; 
    } 


}

和

<!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:ui="http://java.sun.com/jsf/facelets" 
    xmlns:h="http://java.sun.com/jsf/html" 
    xmlns:f="http://java.sun.com/jsf/core" 
    xmlns:p="http://primefaces.org/ui"> 
<h:head></h:head> 
<h:body> 
     <h:form> 
      <h:outputLabel value="Country" 
       for="addcountry" /> 
      <p:selectOneMenu id="addcountry" value="#{addressBean.address.country}"> 
       <f:selectItems value="#{addressBean.getCountries()}" /> 
       <p:ajax listener="#{addressBean.updateState}" update="addstate"/> 
      </p:selectOneMenu> 

      <h:outputLabel value="State" for="addstate" /> 
      <p:selectOneMenu id="addstate" value="#{addressBean.address.state}" disabled="#{addressBean.disableState}"> 
       <f:selectItem itemLabel="Select State" itemValue="" /> 
       <f:selectItems value="#{addressBean.getStates()}" /> 
      </p:selectOneMenu> 
     </h:form> 
</h:body> 
</html>

來源

2014-01-22 06:52:09

好方法，但對於我的代碼是我如何不幸結構不完全正確。實際的問題似乎是，因爲addressBean.adress.country最初是一個空字符串，直到它被分配了一個隨後被更改的值，事件纔會被觸發，這意味着事件不會被觸發，第二選擇。 – Ectomorph

更新：我從第二個seleconemenu中刪除了'disabled'，所以它總是呈現，然後當測試時，我也從這個下拉列表中選擇了一個，如果ajax更新被調用，它會重置這個選擇，它會這樣做。因此，總而言之，每次調用ajax render'addState時，只有address.country的值在第二次選擇前纔會更新。 – Ectomorph

基於選定的selectOneMenu項目啓用jsf組件

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