Michele Mariotti Michele Mariotti - 4 months ago 53
Ajax Question

p:ajax immediate="true" on UIInput does not skip validation

TL;DR



<h:form>
<p:inputText required="true">
<p:ajax event="click" immediate="true" process="@this" update="@this" />
</p:inputText>
</h:form>


click causes validation, even if ajax is immediate. Why?




I can't make finally made this work out:

<h:form>
<p:dataGrid var="elem" value="#{immediateTestBean.elements}" columns="3">
<f:facet name="footer">
<p:commandButton action="#{immediateTestBean.newElement}" immediate="true"
process="@namingcontainer" update="@namingcontainer" value="#{bundle.add}" />
</f:facet>

<h:panelGrid columns="3">
<p:selectOneMenu value="#{elem.type}">
<p:ajax immediate="true" process="@form" update="@form" />
<f:selectItem itemValue="text" itemLabel="#{bundle.text}" />
<f:selectItem itemValue="date" itemLabel="#{bundle.date}" />
</p:selectOneMenu>

<h:panelGroup id="detail">
<p:inputText value="#{elem.text}" required="true" rendered="#{elem.type == 'text'}"
validator="#{immediateTestBean.testValidate}" label="#{bundle.text}">
<f:validateLength minimum="4" />
</p:inputText>
<p:calendar value="#{elem.date}" required="true" rendered="#{elem.type == 'date'}"
pattern="dd/MM/yyyy" readonlyInput="true" showOn="button"
validator="#{immediateTestBean.testValidate}" label="#{bundle.date}" />
</h:panelGroup>

<p:commandButton action="#{immediateTestBean.removeElement(elem)}" immediate="true"
process="@namingcontainer" update="@namingcontainer" value="#{bundle.remove}" />
</h:panelGrid>
</p:dataGrid>

<p:spacer height="10" style="display: block" />

<p:commandButton process="@form" update="@form" value="#{bundle.submit}" />
</h:form>


Everything works fine, except
<p:ajax immediate="true" process="@form" update="@form" />
which does not behave as
UICommand
s do: validation occurs (but in
APPLY_REQUEST_VALUES
phase).

I tried to dig inside JSF source code and noted that
UICommand
s call
facesContext.renderResponse()
in default
ActionListenerImpl.processAction()
, so I tried with:

<p:ajax listener="#{facesContext.renderResponse}" immediate="true" process="@form" update="@form" />


Now, when I select 'date', validation is skipped, but
<h:panelGroup id="detail">
is not updated.

Then, I tought that skipping validation caused skip of update model too, so I called:

<p:ajax listener="#{immediateTestBean.skip}" immediate="true" process="@form" update="@form" />


And finally it works.

But two questions arose:


  1. Why is this so complicated?

  2. Is there a simpler way to achieve the same behavior?



However, here is the code of the bean:

@ManagedBean
@ViewScoped
public class ImmediateTestBean implements Serializable
{
private static final long serialVersionUID = 1L;

private static final Logger logger = LoggerFactory.getLogger(ImmediateTestBean.class);

public class Element
{
private String type = "text";

private String text;

private Date date;

public String getType()
{
return type;
}

public void setType(String type)
{
this.type = type;
}

public String getText()
{
return text;
}

public void setText(String text)
{
this.text = text;
}

public Date getDate()
{
return date;
}

public void setDate(Date date)
{
this.date = date;
}
}

private final List<Element> elements = new ArrayList<>();

public void testValidate(FacesContext context, UIComponent component, Object value)
{
logger.debug("phase: {}", context.getCurrentPhaseId());
}

public void skip()
{
logger.debug("Faces.getCurrentPhaseId(): {}", Faces.getCurrentPhaseId());

UIInput component = (UIInput) Components.getCurrentComponent();
logger.debug("component: {}", component);

FacesContext context = Faces.getContext();
component.validate(context);
if(component.isValid())
{
component.updateModel(context);
}

Faces.renderResponse();
}

public void newElement()
{
elements.add(new Element());
}

public void removeElement(Element elem)
{
elements.remove(elem);
}

public List<Element> getElements()
{
return elements;
}
}

Answer

This is a lack of JSF, which cannot be simulated with immediate="true" in every case.

Just use OmniFaces SkipValidators