What I'd like to do is simple to explain :
bean
@ManagedBean
@ViewScoped
public class Articles {
private String selectedMenu;
@PostConstruct
public void init() {
if(selectedMenu==null || selectedMenu.trim().isEmpty()) {
this.selectedMenu="0";
}
}
public String getSelectedMenu() { return selectedMenu; }
public void setSelectedMenu(String selectedMenu) { this.selectedMenu = selectedMenu; }
}
页面
<h:selectOneListbox onchange="..?? ajax call that render on loadMenu and pass the value of the focused listbox to Articles Bean" id="category" size="0" >
<f:selectItem itemLabel="first" itemValue="0" />
<f:selectItem itemLabel="second" itemValue="1" />
<f:selectItem itemLabel="third" itemValue="2" />
</h:selectOneListbox>
<h:panelGroup layout="block" id="loadMenu">
<h:panelGroup rendered="#{articles.selectedMenu=='0'}">
MENU 0
</h:panelGroup>
<h:panelGroup rendered="#{articles.selectedMenu=='1'}">
MENU 1
</h:panelGroup>
<h:panelGroup rendered="#{articles.selectedMenu=='2'}">
MENU 2
</h:panelGroup>
</h:panelGroup>
当我更改列表框的值时,菜单应该通过调用服务器上的某些函数来动态更改。我认为上面的代码表达了我所寻找的内容。
我必须知道如何使用onchange选项来调用它。这可能吗?
干杯!
更新
<h:panelGroup layout="block">
<h:selectOneListbox styleClass="article_combo" size="0" id="selectedMenu" >
<f:selectItem itemLabel="first" itemValue="0" />
<f:selectItem itemLabel="second" itemValue="1" />
<f:selectItem itemLabel="third" itemValue="2" />
<f:ajax event="change" execute="@this" render="loadMenu" />
</h:selectOneListbox>
</h:panelGroup>
<h:panelGroup layout="block" id="loadMenu">
<h:panelGroup rendered="#{articles.selectedMenu=='0'}">
MENU 0
</h:panelGroup>
<h:panelGroup rendered="#{articles.selectedMenu=='1'}">
MENU 1
</h:panelGroup>
<h:panelGroup rendered="#{articles.selectedMenu=='2'}">
MENU 2
</h:panelGroup>
</h:panelGroup>
event="change"
。然而,h:selectOneMenu
的默认事件已经是change
。你尝试过了吗?正如 Brian 建议的那样,这一行应该已经足够了。 - BalusCh:selectOneMenu
的value
绑定到#{articles.selectedMenu}
。 - BalusC