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I'm writing a composite component, you have a special tag named:
<composite:insertChildren />
Which inserts all the component's children there. Is there any way to know whether the component has children? Like a boolean value that could go on a "rendered" attribute.
612
The basic expression you're after is the following:
#{cc.childCount} or more elaborately:
#{component.getCompositeComponentParent(component).childCount}
E.g. the following composite component:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:cc="http://java.sun.com/jsf/composite"
>
<cc:interface/>
<cc:implementation>
<h:outputText value="Children: #{cc.childCount}" />
</cc:implementation>
</html>
used on the following Facelet:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:test="http://java.sun.com/jsf/composite/test"
>
<h:body>
<test:myCom>
<h:outputText value="first child" />
<h:outputText value="second child" />
</test:myCom>
</h:body>
</html>
will print Children: 2.
Thus #{cc.childCount != 0} will tell you whether a composite component has children or not.
60
I've encountered the same problem and managed to find children of a composite component within it's facet 'javax.faces.component.COMPOSITE_FACET_NAME'.
In Java it's like this:
// we are within some method of UIComponent
UIComponent childrenHolderFacet = getFacets().get("javax.faces.component.COMPOSITE_FACET_NAME");
Iterator<UIComponent> childrenIt = childrenHolderFacet.getChildren().iterator();
...
In JSF it's something like:
#{component.getFacets().get("javax.faces.component.COMPOSITE_FACET_NAME").children}
Hope it helps.
41
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