Given a <p:selectOneMenu> as follows.
<f:metadata>
<f:viewParam name="id" value="#{testManagedBean.id}" converter="javax.faces.Long"/>
</f:metadata>
<p:selectOneMenu value="#{localeBean.language}" onchange="changeLanguage();">
<f:selectItem itemValue="en" itemLabel="English" />
<f:selectItem itemValue="hi" itemLabel="Hindi" />
</p:selectOneMenu>
<p:remoteCommand action="#{testManagedBean.submitAction}"
name="changeLanguage"
process="@this"
update="@none"/>
The corresponding managed bean :
@ManagedBean
@RequestScoped
public final class TestManagedBean {
private Long id; //Getter and setter.
public TestManagedBean() {}
public String submitAction() {
return FacesContext.getCurrentInstance().getViewRoot().getViewId() + "?faces-redirect=true&includeViewParams=true";
}
}
The parameter as indicated by <f:viewParam> is optional. A page, for example is accessed using a URL as follows.
https://localhost:8181/Project-war/private_resources/Test.jsf
Since id is an optional parameter, an empty parameter is attached to the URL (when a language is changed from <p:selectOneMenu>), in case it is not supplied as follows.
https://localhost:8181/Project-war/private_resources/Test.jsf?id=
This should not happen. An empty parameter should not be appended, if it is not supplied and the URL should look like the first one.
Is there a way to prevent an empty parameter from being appended to the URL, when it is not passed?
This is only associated with the converter as specified with <f:viewParam> - javax.faces.Long.
If this converter is removed then, parameters are not appended to the URL, in case no parameters are supplied.
Although specifying a converter as demonstrated here is completely unnecessary, I have converters as shown below to convert an id passed though the URL as a query-string parameter to a JPA entity.
@ManagedBean
@RequestScoped
public final class ZoneConverter implements Converter {
@EJB
private final SharableBeanLocal sharableService = null;
@Override
public Object getAsObject(FacesContext context, UIComponent component, String value) {
try {
long parsedValue = Long.parseLong(value);
if (parsedValue <= 0) {
throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Message Summary", "Message"));
}
ZoneTable entity = sharableService.findZoneById(parsedValue);
if (entity == null) {
throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_WARN, "Message Summary", "Message"));
}
return entity;
} catch (NumberFormatException e) {
throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Message Summary", "Message"), e);
}
}
@Override
public String getAsString(FacesContext context, UIComponent component, Object value) {
return value instanceof ZoneTable ? ((ZoneTable) value).getZoneId().toString() : "";
}
}
This converter is now required to be specified explicitly with <f:viewParam> as follows.
<f:viewParam name="id"
value="#{testManagedBean.id}"
converter="#{zoneConverter}"
rendered="#{not empty param.id}"/>
And the associated managed bean needs to be changed as follows.
@ManagedBean
@RequestScoped
public final class TestManagedBean {
private ZoneTable id; //Getter and setter.
public TestManagedBean() {}
public String submitAction() {
return FacesContext.getCurrentInstance().getViewRoot().getViewId() + "?faces-redirect=true&includeViewParams=true";
}
}
required="false"for your<f:viewParam>? – Degressionrequiredof<f:viewParam>tofalsebut that didn't make a different either. – Beaman*.xhtmlis used as mapping pattern in order than*.jsfstarting from JSF 2.x. 2. You forgot to tell about#{bean}'s implementation. 3. You wrap a lot of irrelevant code for your question: the managed properties are not related with your case, neither thep:remoteCommand. Remove them and minimize your test case till you can reproduce the issue with the minimal code. If you keep having it, post it as it is. See SSCCE question formatting.PD:I made a test case about your issue with no problem. – Steak