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我正在嘗試構建一個Web應用程序，該應用程序涉及一個下拉菜單，該菜單在選擇某個選項時使用數據填充表格。我有問題，所以試圖通過嘗試重新創建following example from the Primefaces website.來解決問題，我有以下問題：selectOneMenu生成項目符號列表
1）selectOneMenu在結果頁面上方生成一個文本框。
2）seelctOneMenu還會生成選項菜單上已有選項的項目符號列表。
3）第一個選擇菜單上的ajax監聽器不會更新第二個菜單，並且似乎沒有在DropdownView類中運行任何方法。
簡而言之，輸出是意想不到的，特別是因爲我或多或少的複製/粘貼示例代碼。
我使用Weblogic，JSF 2.2和Primefaces 6.0在JDeveloper12c上運行這一切。
這裏是我運行的代碼，幾乎全部是複製/從Primefaces網站
粘貼在這裏是我的dropdown.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:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:p="http://primefaces.org/ui">
<body>
<h:form>
<h:messages errorStyle="color:red" />
<p:growl id="msgs" showDetail="true" />
<p:panel header="Select a Location" style="margin-bottom:10px;">
<h:panelGrid columns="2" cellpadding="5">
<p:outputLabel for="country" value="Country: " />
<p:selectOneMenu id="country" value="#{dropdownView.country}" style="width:150px">
<p:ajax listener="#{dropdownView.onCountryChange()}" update="city" />
<f:selectItem itemLabel="Select Country" itemValue="" noSelectionOption="true" />
<f:selectItems value="#{dropdownView.countries}" />
</p:selectOneMenu>
<p:outputLabel for="city" value="City: " />
<p:selectOneMenu id="city" value="#{dropdownView.city}" style="width:150px">
<f:selectItem itemLabel="Select City" itemValue="" noSelectionOption="true" />
<f:selectItems value="#{dropdownView.cities}" />
</p:selectOneMenu>
</h:panelGrid>
<p:separator />
<p:commandButton value="Submit" update="msgs" actionListener="#{dropdownView.displayLocation()}" icon="ui-icon-check" />
</p:panel>
</h:form>
</body>
</html>
我DropdownView.java，這是相同的從示例站點代碼：
package test;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
@ManagedBean
@ViewScoped
public class DropdownView implements Serializable {
private Map<String,Map<String,String>> data = new HashMap<String, Map<String,String>>();
private String country;
private String city;
private Map<String,String> countries;
private Map<String,String> cities;
@PostConstruct
public void init() {
countries = new HashMap<String, String>();
countries.put("USA", "USA");
countries.put("Germany", "Germany");
countries.put("Brazil", "Brazil");
Map<String,String> map = new HashMap<String, String>();
map.put("New York", "New York");
map.put("San Francisco", "San Francisco");
map.put("Denver", "Denver");
data.put("USA", map);
map = new HashMap<String, String>();
map.put("Berlin", "Berlin");
map.put("Munich", "Munich");
map.put("Frankfurt", "Frankfurt");
data.put("Germany", map);
map = new HashMap<String, String>();
map.put("Sao Paolo", "Sao Paolo");
map.put("Rio de Janerio", "Rio de Janerio");
map.put("Salvador", "Salvador");
data.put("Brazil", map);
}
public Map<String, Map<String, String>> getData() {
return data;
}
public void setData(Map<String, Map<String, String>> data) {
this.data = data;
}
public void setCountries(Map<String, String> countries) {
this.countries = countries;
}
public void setCities(Map<String, String> cities) {
this.cities = cities;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public Map<String, String> getCountries() {
return countries;
}
public Map<String, String> getCities() {
return cities;
}
public void onCountryChange() {
if(country !=null && !country.equals(""))
cities = data.get(country);
else
cities = new HashMap<String, String>();
}
public void displayLocation() {
FacesMessage msg;
if(city != null && country != null)
msg = new FacesMessage("Selected", city + " of " + country);
else
msg = new FacesMessage(FacesMessage.SEVERITY_ERROR, "Invalid", "City is not selected.");
FacesContext.getCurrentInstance().addMessage(null, msg);
}
}
這裏是我的W酒店eb.xml：
<?xml version = '1.0' encoding = 'windows-1252'?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<servlet>
<servlet-name>FacesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>FacesServlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
</web-app>
這裏是我的faces-config.xml中：
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
version="2.2">
</faces-config>