Dialog not updating after populating model in action method

问题

I am using a primefaces dialog box. I have a list of items, and whenever I choose an item, I want the dialog box to display that item name. However, this is not happening. Rather than displaying the item name, the dialog is not displaying any name at all. I've posted my code below.

       <h:form>
         <h:dataTable binding="#{table}" value="#{item.itemList}" >
          <h:column>
            <h:link value="#{item.itemList[table.rowIndex]}" outcome="item">
              <f:param name="itemName" value="#{item.itemList[table.rowIndex]}" />
            </h:link>
          </h:column>
          <h:column>
            <p:commandButton action="#{item.setItem(item.itemList[table.rowIndex])}" id="showDialogButton" 
                             type="link" value="Delete" onclick="dlg.show()" />
          </h:column>
        </h:dataTable>
        <br />
        <p:dialog header="Item" widgetVar="dlg" resizable="false">
          <!-- I've also tried Item: #{item.item} -->
          <p>Item: <f:attribute name="contentId" value="#{item.item}"/> </p>
          <p:commandButton id="submitButton" value="Yes" action=
              "#{item.deleteItem}" oncomplete="dlg.hide();">
          </p:commandButton>
          <p:commandButton id="cancelButton" value="Cancel" oncomplete="dlg.hide();" />
        </p:dialog>

      </h:form>

My getters and setters are just generic getters and setters.

回答1:

You forgot to update the dialog before opening.

<p:commandButton ... update="dialogId" />

I also suggest to use oncomplete instead of onclick to open the dialog.

See also:

• Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
• How to show details of current row from p:dataTable in a p:dialog and update after save
• Primefaces p:dialog doesn't always show up if update="dlg" in commandButton

来源：https://stackoverflow.com/questions/17527697/dialog-not-updating-after-populating-model-in-action-method