在rich：modalPanel中支持a4j：

Question

I've hit a wall. I know the a4j and rich tags pretty well (I use Seam 2.2.0 and Richfaces 3.3.1). However, I'm trying to do something quite simple, but in a rich:modalPanel.

It seems that rich:modalPanels do not allow Ajax events to be fired. Here's a simple breakdown: I have ah:selectOneMenu with some items in it and whose value is attached to a backing bean. Attached to that h:selectOneMenu is a a4j:support tag so that whenever the change event is fired, the backing bean should get updated. Truly simple stuff eh?

However, when this h:selectOneMenu is in a rich:modalPanel the onchange event doesn't update the backing bean until the rich:modalPanel closes.

I can confirm this because I'm running it in Eclipse debug mode and I have a breakpoint on the setter of the property that's hooked up to the h:selectOneMenu. This is driving me mad! This is vanilla stuff for Ajax, but rich:modalPanels don't seem to allow it.

So, the question is: can I do Ajax stuff within a rich:modalPanel? I'm basically trying to use the rich:modalPanel as a form (I've tried a4j:form and h:form to no avail) that reacts to changes to the drop down (eg when the user changes the drop down, a certain part of the form should get reRendered). Am I trying to do something that's not possible?

Here's a simplified version of the modalPanel:

<rich:modalPanel id="quickAddPanel">
    <div>
        <a4j:form id="quickAddPaymentForm" ajaxSubmit="true">
                <s:decorate id="paymentTypeDecorator">
                    <a4j:region>
                        <h:selectOneMenu
                            id="paymentType"
                            required="true"
                            value="#{backingBean.paymentType}"
                            tabindex="1">
                            <s:selectItems 
                                label="#{type.description}"
                                noSelectionLabel="Please select..."
                                value="#{incomingPaymentTypes}"
                                var="type"/>
                            <s:convertEnum/>
                            <a4j:support 
                                ajaxSingle="true" 
                                event="onchange"
                                eventsQueue="paymentQueue"
                                immediate="true"
                                limitToList="true"
                                reRender="paymentTypeDecorator, paymentDetailsOutputPanel, quickAddPaymentForm"/>
                        </h:selectOneMenu>
                    </a4j:region>
                </s:decorate>
            </fieldset>

            <fieldset class="standard-form">
                <div class="form-title">Payment details</div>
                <a4j:outputPanel id="paymentDetailsOutputPanel">
                    <h:outputText value="This should change whenever dropdown changes: #{backingBean.paymentType}"/>
                </a4j:outputPanel>
            </fieldset>
        </a4j:form>
    </div>
</rich:modalPanel>

Regards, Andy

Answer 1

use <h:form>

and remove following attributes from : ajaxSingle="true", immediate="true"

Answer 2

It should work. Check with a4j:log that updated markup (which you re-render) is sent from the server. I don't believe it causes the problem, but you can change a few things in your code:

ajaxSubmit=true - you don't really need it as you use a4j:support ajaxSingle=true and a4j:region - is the same thing in your case limitToList=true - you don't need it as you don't update any other areas on the page.

Answer 3

Check HTML options generated by f:selectItems or s:selectItems do not contain trailing spaces (view page source from browser):

<select>
  <option value="0    ">Select One    </option>
  <option value="id1    ">Choice 1    </option>
  <option value="id2    ">Choice 2    </option>
  <option value="id3    ">Choice 3    </option>
</select>

If so, remove the trailing white spaces in server side code,

<select>
  <option value="0">Select One</option>
  <option value="id1">Choice 1</option>
  <option value="id2">Choice 2</option>
  <option value="id3">Choice 3</option>
</select>

I found that the trailing spaces prevent Ajax event from firing when a4j:support and h:selectOneMenu working inside a rich:modalPanel, even though it works fine outside of rich:modalPanel. Here is a working sample code:

<h:form>
<rich:modalPanel id="myPanel" autosized="true" width="700" showWhenRendered="true">
  <table cellpadding="4" cellspacing="2" align="center" width="100%">
  <tr>
    <td align="left">
      <h:selectOneMenu styleClass="dropdown" id="dropdownList"
          value="#{backbean.currentChoice}"
          valueChangeListener="#{backbean.choiceChanged}" >
          <f:selectItems value="#{backbean.choiceItems}"></f:selectItems>
          <a4j:support event="onchange" reRender="whatPicked" ajaxSingle="true" />
          </h:selectOneMenu>
      </td>
    </tr>
    <tr>
      <td>
        <a4j:outputPanel id="whatPicked"> 
          <h:outputText value="#{backbean.currentChoice }"></h:outputText>
        </a4j:outputPanel>
      </td>
    </tr>
  </table>
</rich:modalPanel>
</h:form>

Answer 4

Try taking form outside of your modalPanel tag:

<a4j:form id="quickAddPaymentForm" ajaxSubmit="true">
    <rich:modalPanel id="quickAddPanel">
        <div>

also make sure your "quickAddPaymentForm" is not nested