PrimeFaces DataTable选项在dialog.show（）上为空 [英] PrimeFaces DataTable selection goes null on dialog.show()
问题描述
我需要点击一个datatable的行，并显示一个从datatable的所选项目中加载数据的对话框
选择一切正常，但是一旦显示对话框，所选元素就会设置为null：/
以下是一些代码：
< h：form id =form>
< pou：dataTable widgetVar =convid =mexvar =convvalue =＃{messagesBean.listaConversazioni}paginator =truerowKey =＃{conv}paginatorPosition = bottom
selection =＃{messagesBean.destinatario}selectionMode =singlerows =15>
< pou：ajax event =rowSelect
oncomplete =convDialog.show（）update =：form：display，：growl，，menuPanel/>
< pou：column>
< f：facet name =header>
< h：outputText value =Conversazioni/>
< / f：facet>
< h：outputText value =＃{conv.username}/>
< / pou：column>
< / pou：dataTable>
< pou：dialog id =convDialogheader =ConversazionewidgetVar =convDialogonHide =conv.unselectAllRows（）position =centermodal =trueresizable = falsedraggable =false
showEffect =explodehideEffect =explodeheight =635width =620>
< h：panelGrid id =display>
< pou：panel id =postForm>
< div align =center>
< pou：inputTextarea value =＃{messagesBean.messaggio}cols =50autoResize =truemaxlength =255/> < br />
< pou：commandButton action =＃{messagesBean.invia（messagesBean.destinatario）}value =Inviaupdate =display，，growl/>
< / div>
< / pou：panel>
< pou：panel>
< div class =conversazionePanel>
< pou：dataTable id =mexTablevar =mexvalue =＃{messagesBean.caricaConversazione（messagesBean.destinatario）}rowStyleClass =postTable>
< pou：column style =border：none; background：rgba（0,0,0,0）>
< div id =messaggio _＃{mex.idMessaggio}>
< pou：outputPanel rendered =＃{mex.mittente eq loginBean.utente}>
< pou：panelGrid columns =2>
< h：outputText value =Io/>
< div class =messaggioInviato>＃{mex.testo}< / div>
< / pou：panelGrid>
< / pou：outputPanel>
< pou：outputPanel rendered =＃{mex.destinatario eq loginBean.utente}>
< pou：panelGrid columns =2>
< div class =messaggioRicevuto>＃{mex.testo}< / div>
< h：outputText value =＃{mex.mittente.username}/>
< / pou：panelGrid>
< / pou：outputPanel>
< / div>
< / pou：column>
< / pou：dataTable>
< / div>
< / pou：panel>
< / h：panelGrid>
< / pou：dialog>
< / h：form>
_
＃{messagesBean.listaConversazioni} 返回用户列表
_
＃{conv} 是用户
_
＃{messagesBean.destinatario} 是我需要设置的用户。奇怪的是，这个奇怪的想法是：
pre> < pou：dataTable id =mexTablevar =mexvalue =＃{messagesBean.caricaConversazione（messagesBean.destinatario）}
而在同一个对话框中
< h：outputText value =＃{messagesBean.destinatario == null}>
打印true：\
什么是错了吗？
不确定，但 rowKey =＃{conv.id}也许？
I've got a BIG problem using Datatable and Dialog together.
I need to click on a datatable's row and showing a dialog which loads data from datatable's selected item.
Selection goes fine, but the selected element is set to null as soon as the dialog is shown :/
Here's some code :
<h:form id="form">
<pou:dataTable widgetVar="conv" id="mex" var="conv" value="#{messagesBean.listaConversazioni}" paginator="true" rowKey="#{conv}" paginatorPosition="bottom"
selection="#{messagesBean.destinatario}" selectionMode="single" rows="15">
<pou:ajax event="rowSelect"
oncomplete="convDialog.show()" update=":form:display, :growl, :menuPanel" />
<pou:column>
<f:facet name="header">
<h:outputText value="Conversazioni"/>
</f:facet>
<h:outputText value="#{conv.username}"/>
</pou:column>
</pou:dataTable>
<pou:dialog id="convDialog" header="Conversazione" widgetVar="convDialog" onHide="conv.unselectAllRows()" position="center" modal="true" resizable="false" draggable="false"
showEffect="explode" hideEffect="explode" height="635" width="620">
<h:panelGrid id="display">
<pou:panel id="postForm">
<div align="center">
<pou:inputTextarea value="#{messagesBean.messaggio}" cols="50" autoResize="true" maxlength="255"/> <br/>
<pou:commandButton action="#{messagesBean.invia(messagesBean.destinatario)}" value="Invia" update="display, :growl"/>
</div>
</pou:panel>
<pou:panel>
<div class="conversazionePanel">
<pou:dataTable id="mexTable" var="mex" value="#{messagesBean.caricaConversazione(messagesBean.destinatario)}" rowStyleClass="postTable">
<pou:column style="border: none; background: rgba(0,0,0,0)">
<div id="messaggio_#{mex.idMessaggio}">
<pou:outputPanel rendered="#{mex.mittente eq loginBean.utente}">
<pou:panelGrid columns="2">
<h:outputText value="Io"/>
<div class="messaggioInviato">#{mex.testo}</div>
</pou:panelGrid>
</pou:outputPanel>
<pou:outputPanel rendered="#{mex.destinatario eq loginBean.utente}">
<pou:panelGrid columns="2">
<div class="messaggioRicevuto">#{mex.testo}</div>
<h:outputText value="#{mex.mittente.username}"/>
</pou:panelGrid>
</pou:outputPanel>
</div>
</pou:column>
</pou:dataTable>
</div>
</pou:panel>
</h:panelGrid>
</pou:dialog>
</h:form>
_
#{messagesBean.listaConversazioni} returns a List of User
_
#{conv} is a User
_
#{messagesBean.destinatario} is the User that I need to set. It takes conv's value when I click on the row, but it suddenly takes null.
The strange think is that
<pou:dataTable id="mexTable" var="mex" value="#{messagesBean.caricaConversazione(messagesBean.destinatario)}"
while, in the same dialog
<h:outputText value="#{messagesBean.destinatario==null}">
prints true :\
What's wrong with it ?
Not sure, but rowKey="#{conv.id}" maybe?
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