我使用的是 Primefaces 3.4.2.
I am using Primefaces 3.4.2.
我的 JSF 页面中有以下内容
I have the following in my JSF page
<p:selectOneMenu id="emp" value="#{mymb.emp.employeeName}" valueChangeListener="#{mymb.handleChange}" required="true" style="width: 150px;"> <f:selectItem noSelectionOption="true" itemLabel="Please Select"/> <f:selectItems value="#{mymb.employeeList}" var="emp" itemLabel="#{emp.employeeName}" itemValue="#{emp.employeeNumber}"/> <p:ajax update="sublist"/> </p:selectOneMenu>在 ManagedBean 中
and in ManagedBean
public void handleChange(ValueChangeEvent event){ System.out.println("here "+event.getNewValue()); }问题是 valueChangeListener 没有触发,即没有调用 handleChange 方法.我尝试了以下方法,但它也不起作用.
The problem is valueChangeListener is not firing, i.e. handleChange method is not getting invoked. I tried with the following, but it is not working either.
<p:ajax update="sublist" listener="#{mymb.handleChange}" />单独的 JSF 页面:
Separate JSF page:
<ui:composition template="/templates/layout.xhtml" xmlns="www.w3/1999/xhtml" xmlns:f="java.sun/jsf/core" xmlns:h="java.sun/jsf/html" xmlns:ui="java.sun/jsf/facelets" xmlns:p="primefaces/ui"> <ui:define name="content"> <h:head> </h:head> <h:body> <h:form id="form"> <p:panelGrid columns="6"> <h:outputLabel value="Employees" for="employees" /> <p:selectOneMenu id="employees" value="#{mymb.employeesList}" required="true"> <f:selectItems value="#{mymb.employeesList}" var="emp" itemLabel="#{emp.employeeName}" /> <p:ajax listener="#{mymb.handleChange}" /> </p:selectOneMenu> </p:panelGrid> </h:form> </h:body> </ui:define> </ui:composition> 推荐答案如果要使用valueChangeListener,则每次选择新选项时都需要提交表单.像这样:
If you want to use valueChangeListener, you need to submit the form every time a new option is chosen. Something like this:
<p:selectOneMenu value="#{mymb.employee}" onchange="submit()" valueChangeListener="#{mymb.handleChange}" > <f:selectItems value="#{mymb.employeesList}" var="emp" itemLabel="#{emp.employeeName}" itemValue="#{emp.employeeID}" /> </p:selectOneMenu> public void handleChange(ValueChangeEvent event){ System.out.println("New value: " + event.getNewValue()); }否则,如果你想使用,它应该是这样的:
Or else, if you want to use <p:ajax>, it should look like this:
<p:selectOneMenu value="#{mymb.employee}" > <p:ajax listener="#{mymb.handleChange}" /> <f:selectItems value="#{mymb.employeesList}" var="emp" itemLabel="#{emp.employeeName}" itemValue="#{emp.employeeID}" /> </p:selectOneMenu> private String employeeID; public void handleChange(){ System.out.println("New value: " + employee); }需要注意的一点是,在您的示例代码中,我看到您的 的 value 属性是 #{mymb.employeeList} 与 的 value 相同.您的 的 value 应该类似于我上面的示例,指向单个员工,而不是员工列表.
One thing to note is that in your example code, I saw that the value attribute of your <p:selectOneMenu> is #{mymb.employeesList} which is the same as the value of <f:selectItems>. The value of your <p:selectOneMenu> should be similar to my examples above which point to a single employee, not a list of employees.
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Primefaces valueChangeListener 或 <p:ajax 侦听器不会为 p:selectOneMenu 触发
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