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The omnifaces.ListIndexConverter is a variant of the ListConverter which automatically converts based on the position (index) of the selected item in the list instead of the #toString() of the selected item.

Usage

This converter is available by converter ID omnifaces.ListIndexConverter and should be used in combination with <o:converter> in order to be able to pass the List source to it, which it can use for conversion. Here's a basic usage example with PrimeFaces <p:pickList>, which is one of the few select components which doesn't use SelectItems as the source, but work directly via a List.

 <p:pickList value="#{bean.dualListModel}" var="entity" itemValue="#{entity}" itemLabel="#{entity.someProperty}">
     <o:converter converterId="omnifaces.ListIndexConverter" list="#{bean.dualListModel.source}" />
 </p:pickList>
 

Since OmniFaces 4.5 it's also available by <o:listIndexConverter> tag.

 <p:pickList value="#{bean.dualListModel}" var="entity" itemValue="#{entity}" itemLabel="#{entity.someProperty}">
     <o:listIndexConverter" list="#{bean.dualListModel.source}" />
 </p:pickList>
 

Pros and cons as compared to ListConverter

For detail, refer the javadoc of SelectItemsIndexConverter and substitute "SelectItemsIndexConverter" by "ListIndexConverter" and "SelectItemsConverter" by "ListConverter".