Java JSF呈现不起作用
我的网页上有这样一个选择/下拉菜单。此下拉菜单应根据所选项目生成另一个下拉菜单。我这样做是通过调用Java JSF呈现不起作用,java,ajax,jsf,jakarta-ee,Java,Ajax,Jsf,Jakarta Ee,我的网页上有这样一个选择/下拉菜单。此下拉菜单应根据所选项目生成另一个下拉菜单。我这样做是通过调用 <h:selectOneMenu value="#{teacher.viewCategory}"> <f:selectItem itemValue="0" itemLabel="Tahun" /> <f:sel
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
但这并没有像我预期的那样发生。在下拉菜单中选择项触发ajax标记中的侦听器时,以下下拉表的rendered
属性似乎不受更改的影响。渲染的的值成功地从false更改为true。这让我想知道我的jsf页面出了什么问题
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
这是xhtml
'
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
当我调试时,该函数运行良好。如果部分呈现不起作用,一个好的起点是在浏览器中呈现页面时查看页面的html源代码。您的render=“divYearSelection”
只有在两者(ajax触发组件和目标组件)具有相同的直接父容器时才起作用
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
呈现的html组件的id通常看起来像id=“formId:componentId:nestedComponentId1”
或id=“formId:componentId:nestedComponentId2”
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
因此,从component1调用的render=“nestedComponentD2”
只有在两个ID具有相同的“尾部”时才能工作
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
您可以尝试使用示例中给出的完整id,从表单id开始,或者(如果整个表单不太大)使用更新整个表单的render=“@form”
。如果部分呈现不起作用,一个好的起点是在浏览器中呈现页面时查看页面的html源代码。您的render=“divYearSelection”
只有在两者(ajax触发组件和目标组件)具有相同的直接父容器时才起作用
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
呈现的html组件的id通常看起来像id=“formId:componentId:nestedComponentId1”
或id=“formId:componentId:nestedComponentId2”
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
因此,从component1调用的render=“nestedComponentD2”
只有在两个ID具有相同的“尾部”时才能工作
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'
您可以尝试使用示例中给出的完整id,从表单的id开始,或者(如果整个表单不太大)使用更新整个表单的render=“@form”
。如果在ajax命令中使用render=“@form”
,是否有效?这就成功了!你介意在ajax标签上给我解释一下吗?另外,把它作为一个答案,这样我就可以给你打分了。谢谢@马特,你能不能把这个作为答案贴出来,这样我就可以给它打分了!很高兴听到这个消息!如果在ajax命令中使用render=“@form”
,它能工作吗?这就成功了!你介意在ajax标签上给我解释一下吗?另外,把它作为一个答案,这样我就可以给你打分了。谢谢@马特,你能不能把这个作为答案贴出来,这样我就可以给它打分了!很高兴听到这个消息!我只是有同样的问题render=“message”
或render=“:message”
正在工作。我做了render=“form:message”
,它正在工作!请你解释一下原因好吗?我也有同样的问题render=“message”
或render=“:message”
正在工作。我做了render=“form:message”
,它正在工作!请你解释一下原因好吗?
<h:selectOneMenu value="#{teacher.viewCategory}">
<f:selectItem itemValue="0" itemLabel="Tahun" />
<f:selectItem itemValue="1" itemLabel="Mata Pelajaran" />
<f:ajax event="change" render="divYearSelection divCourseSelection"
listener="#{teacher.enableViewCategory}"/>
</h:selectOneMenu>
<h:panelGroup id="divYearSelection" layout="block" rendered="#{teacher.showViewYearSelection}">
<h:outputText value="YEAR"/>
</h:panelGroup>
<h:panelGroup id="divCourseSelection" layout="block" rendered="#{teacher.showViewCourseSelection}">
<h:outputText value="COURSE"/>
</h:panelGroup>
<h:commandButton value="#{msg.tcr_form_submit_view}" action="#{teacher.viewTeacher}"/>
</h:panelGrid>
</h:form>'