<a4j:region> and the "process" attribute
----------------------------------------
Key: RF-11364
URL: https://issues.jboss.org/browse/RF-11364
Project: RichFaces
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 3.3.3.Final
Reporter: Nicholas Oxhøj
Hi,
It seems to me that the <a4j:region> doesn't work correctly together withe the
process="..." attribute on AJAX commands. Specifically you cannot process
inputs outside the <a4j:region> even though you list them specifically in the
process attribute.
I have always thought that ajaxSingle and <a4j:region> were two functionally
equivalent ways of specifying which inputs should be processed in the first
phases of the JSF lifecycle - one is easy to use if you only want to process a
single input and the other if you have a group of related inputs.
In chapter [5.7.4. "Decide what to
process"|http://docs.jboss.org/richfaces/latest_3_3_X/en/devguide/html/ArchitectureOverview.html#process]
of the Richfaces 3.3.X documentation, it is stated that: The "_process_"
attribute allows to define the ids of components to be processed together with
the component which is marked as ajaxSingle *+or wrapped to region+*.
As I understand this, the example in the documentation:
{code:xml}
<h:inputText value="#{bean.name}" id="name">
<a4j:support ajaxSingle="true" process="email" event="onblur"
reRender="someOut"/>
</h:inputText>
<h:inputTextarea value="#{bean.description}" id="desc" />
<h:inputText value="#{bean.email}" id="email">
<a4j:support ajaxSingle="true" process="name" event="onblur"
reRender="someOut"/>
</h:inputText>
{code}
should be functionally equivalent to the following code:
{code:xml}
<a4j:region>
<h:inputText value="#{bean.name}" id="name">
<a4j:support process="email" event="onblur" reRender="someOut"/>
</h:inputText>
</a4j:region>
<h:inputTextarea value="#{bean.description}" id="desc" />
<h:inputText value="#{bean.email}" id="email">
<a4j:support ajaxSingle="true" process="name" event="onblur"
reRender="someOut"/>
/h:inputText>
{code}
But this doesn't work as expected. The "email" component is no longer processed
when focus leaves the "name" component.
The reason for this is found in the class UIAjaxRegion, where all the
"processing methods" (processDecodes, processValidators, and processUpdates)
contains code similar to the following:
{code}
if (ajaxContext.isAjaxRequest() && null != ajaxSingleClientId) {
invokeOnComponent(context, ajaxSingleClientId, new
ContextCallbackWrapper(updateCallback));
Set<String> areasToProcess = ajaxContext.getAjaxAreasToProcess();
if(null != areasToProcess){
for (String areaId : areasToProcess) {
invokeOnComponent(context, areaId, new
ContextCallbackWrapper(updateCallback));
}
}
} else {
super.processUpdates(context);
}
{code}
So the value of the process attribute (retrieved through
ajaxContext.getAjaxAreasToProcess), is only used if the AJAX command has
ajaxSingle="true". I don't understand why the "process" attribute isn't used,
regardless of the value of the ajaxSingle attribute???
Looking at the code, I thought that a workaround would the be to just add
ajaxSingle="true" to the <a4j:support> so that it would again look like:
{code:xml}
<a4j:support ajaxSingle="true" process="email" event="onblur"
reRender="someOut"/>
{code}
But this doesn't work either. Although the code above _will_ now enter the
first branch and therefore loop through the areaIds specified in the process
attribute, it will only find them if they are located inside the <a4j:region>
itself, since the invokeOnComponent() is implicitely called on the
UIAjaxRegion.
Regards,
Nicholas Oxhøj
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