custom boolean converter to set style class

Question

A Converter is defined in faces-config.xml which changes a boolean into a String "Yes" or "No"

<converter>
    <converter-id>booleanConverter</converter-id>
    <converter-class>com.example.BooleanConverter</converter-class>
</converter>

This works fine using

<h:outputText value="#{bean.booleanValue}" converter="booleanConverter" />

But if the intention was to style a surrounding div element is this possible using a converter? For example if a Converter was defined which return String "booleanTrue" and "booleanFalse" (which are defined in CSS)

<converter>
    <converter-id>booleanStyleConverter</converter-id>
    <converter-class>com.example.BooleanStyleConverter</converter-class>
</converter>

Could I do something like:

<div class="#{booleanStyleConverter.getAsString(null,null,bean.booleanValue)}">
    <h:outputText value="#{bean.booleanValue}" converter="booleanConverter" />
</div>

Defining in backing bean works but seems unsatisfactory

public String booleanStyle(boolean value) {
    BooleanStyleConverter bsc = new BooleanStyleConverter();
    return bsc.getAsString(null, null, value);
}

Answer 1

The whole point of the converter is to change the value that's saved to the backing bean into something desirable. Why are you not just using class="#{bean.booleanValue}"?

Or even simpler still : class="textBox.value eq 'true'? 'booleanTrue': 'booleanFalse'", where textBox is the binding of the textbox:

<div class="#{textBox.value eq 'true'? 'booleanTrue': 'booleanFalse'}">
    <h:outputText binding="#{textBox}" id="textBox" value="#{bean.booleanValue}"/> 
</div>