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marți, 5 ianuarie 2016

JSF 2.2 [usage pitfall] - Counting the children of a composite component

Suppose that you have a composite component that accepts children via the <cc:insertChildren/> tag. Sometimes you may need to render a certain message when the list of children is empty, and for this you may think of writing a composite component implementation, as shown in the following code:

 <div id="#{cc.clientId}">
   <h:panelGroup rendered="#{cc.childCount == 0}">
    The list of names is empty!

Now if the composite component is used as follows, you may think that the message The list of names is empty! will be rendered:


Well, you are right! But, the same message, next to the list content, will be rendered when the component is used as follows:


In order to solve this issue, you can use the following code:

 <div id="#{cc.clientId}">
    <c:if test="#{cc.childCount == 0}">
     The list of names is empty!

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