p:ajax无法更新p:inputText [英] p:ajax not updating p:inputText

问题描述

我无法根据使用<p:ajax>在另一个<p:inputText>中输入的值来更新<p:inputText>.我将JSF 2与PrimeFaces 5一起使用.第二个<p:inputText>未更新，与<p:ajax>相关联的侦听器被调用，并且我在侦听器中获取了正确的值，但未在视图上更新.

I am unable to update a <p:inputText> based on the value entered in another <p:inputText> using <p:ajax>. I am using JSF 2 with PrimeFaces 5. The second <p:inputText> is not updating, the listener associated with <p:ajax> is being called and i am getting the correct values in the listener but its not updated on the view.

查看代码为:

<p:dialog id="newStdDlg" header="Add new Student" widgetVar="newStdDlg" modal="true">
    <h:panelGrid id="newStdDlgPanel" columns="2" cellpadding="5" style="width:100%;">
        <p:outputLabel value="First Name *" />
        <p:inputText id="studentfname" value="#{addStudentBean.student.firstName}">
            <p:ajax event="change" update="studentUsrname" listener="#{addStudentBean.firstNameChange}" />
        </p:inputText>

        <p:outputLabel value="Last Name *" />
        <p:inputText value="#{addStudentBean.student.lastName}"/>

        <p:outputLabel value="Father's Name *" />
        <p:inputText value="#{addStudentBean.student.fatherName}"/>

        <p:outputLabel id="uLbl" value="Username (System Generated) *" />
        <p:inputText id="studentUsrname" value="#{addStudentBean.student.user.username}" />

        <p:outputLabel value="This temporary password would be mailed to user: " />
        <p:outputLabel id="stdpassword" value="#{addStudentBean.student.user.password}"/>
    </h:panelGrid>

    <p:commandButton value="Create Student"
                     actionListener="#{addStudentBean.addNewStudentAction}"
                     style="margin-left:auto;margin-right:auto;display:block;"/>
</p:dialog>

，会话作用域托管bean的侦听器是:

and the listener of the session scoped managed bean is :

public void firstNameChange() {
    System.out.println("In AddStudentBean().firstNameChange()..........");
    System.out.println("The value of student.getFirstName: "+student.getFirstName());
    System.out.println("updating system generated username as: "+student.getFirstName()+String.valueOf(new UserDAO().getUserCount()+1));
    student.getUser().setUsername(student.getFirstName()+String.valueOf(new UserDAO().getUserCount()+1));
    student.getUser().setPassword(KaaloUtils.getPassword());
}

推荐答案

就像Jaqen在注释中提到的，注释使用对话框内的h:form.

Like Jaqen mentioned in comments the comments use h:form inside dialog.

如果要从ManagedBean更新组件，可以使用org.primefaces.RequestContext的update方法来完成.

If you want to update the component from ManagedBean you can do that by using org.primefaces.RequestContext's update method.

RequestContext.getCurrentInstance().update("COMPONENT_ID_TO_UPDATE")

如果您觉得此方法过于内聚，则只能从Facelet更新，请确保不要将p:dialog放在h:from中，而不要在p:dialog中使用h:form.

If you feel like this method is too Cohesive, you can update from Facelet only, make sure remember to not place p:dialog in a h:from instead use h:form inside p:dialog .

这篇关于p:ajax无法更新p:inputText的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！