Why does a commandLink within a facet within a composite component renders an error?

问题

When I create a composite component with a facet in it and place a command link within that facet, I get an error message: This link is disabled as it is not nested within a JSF form.

A commandButton does not behave in the same way, so I am inclined to this this is a bug.

index.xhtml :

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:mycomp="http://xmlns.jcp.org/jsf/composite/mycomp"
      xmlns:f="http://xmlns.jcp.org/jsf/core">
    <h:head>
    </h:head>
    <h:body>
        <mycomp:component>
            <f:facet name="someFacet">
                <h:commandLink value="this link should work, but does not (within form, within facet)"/><br/>
                <h:commandButton value="this button works as expected (within form, within facet)"/><br/>
            </f:facet>
        </mycomp:component>
    </h:body>
</html>

/resources/mycomp/component.xhtml :

<?xml version='1.0' encoding='UTF-8' ?>
<ui:component
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://xmlns.jcp.org/jsf/html"
    xmlns:cc="http://xmlns.jcp.org/jsf/composite"
    xmlns:f="http://xmlns.jcp.org/jsf/core"
    xmlns:a="http://xmlns.jcp.org/jsf/passthrough"
    xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
    >
    <cc:interface>
        <cc:facet name="someFacet" required="true"/>
    </cc:interface>
    <cc:implementation>
        <h:commandLink value="this link should not work (not in a form)"/><br/>
        <h:form>
            <h:commandLink value="this link works as expected (within form, but not in facet)"/><br/>
            <cc:renderFacet name="someFacet"/>
        </h:form>
    </cc:implementation>
</ui:component>

This is what my browser makes of it:

Any ideas as to what I may be doing wrong or is this indeed a bug in Mojarra 2.2.7? (which came bundled with NetBeans 8.0.2)

回答1:

an old thread but i think the current behaviour is a bug, because the following works, and so it should work in a composite component:

component.xhtml:

<?xml version='1.0' encoding='UTF-8' ?>
<ui:component
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:cc="http://xmlns.jcp.org/jsf/composite"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:a="http://xmlns.jcp.org/jsf/passthrough"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
>
<cc:interface>
    <cc:facet name="someFacet" required="true"/>
</cc:interface>
<cc:implementation>
    <h:commandLink value="this link should not work (not in a form)"/><br/>
        <h:commandLink value="this link works as expected (within form, but not in facet)"/><br/>
        <cc:renderFacet name="someFacet"/>
</cc:implementation>
</ui:component>

Using it (index.xhtml):

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:mycomp="http://xmlns.jcp.org/jsf/composite/mycomp"
      xmlns:f="http://xmlns.jcp.org/jsf/core">
    <h:head>
    </h:head>
    <h:body>
     <h:form>
        <mycomp:component>
            <f:facet name="someFacet">
                <h:commandLink value="this link should work, but does not (within form, within facet)"/><br/>
                <h:commandButton value="this button works as expected (within form, within facet)"/><br/>
            </f:facet>
        </mycomp:component>
      </h:form>
    </h:body>
</html>

Also the generated HTML output in both cases generates the button in the right place in the component tree (under the form). But the clientId generated for the button, differs in both cases:

First thread post --> clientId without form ID
My post --> clientId includes form ID

In my opinion this seems to be a bug, but perhaps someone can convince me that it is not ;D

Using Mojarra 2.2.13 (Primefaces 6.x).

回答2:

I'm doing the same thing, except I'm inserting a PrimeFaces' p:commandButton via the facet - the button works, the only problem are the warnings, so I'm providing a solution for those.

Add a componentType:

<cc:interface componentType="myComponent">

And a corresponing java class:

import javax.faces.component.FacesComponent;
import javax.faces.component.UINamingContainer;
import javax.faces.component.UIOutput;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;

@FacesComponent
public class MyComponent extends UIOutput /* or UINamingContainer - depends on what you need */ {

    @Override
    public String getFamily() {
        return UINamingContainer.COMPONENT_FAMILY;
    }

    @Override
    public boolean visitTree(VisitContext context, VisitCallback callback) {
        // skip the form checks; we know the form is guaranteed by the component anyway
        String callbackName = callback.getClass().getName();
        if (callbackName.contains("ValidateFormNestingCallback") || callbackName.contains("FormOmittedChecker")) {
            return false;
        }

        return super.visitTree(context, callback);
    }

}

Tested with Mojarra 2.3.3.

来源：https://stackoverflow.com/questions/31996021/why-does-a-commandlink-within-a-facet-within-a-composite-component-renders-an-er

标签

jsf

composite-component

facet

mojarra

commandlink