Concatenating strings within EL expression defined in an attribute of a facelets tag

It is possible to concatenate Strings in EL using the java.lang.String.concat(String) method. Thus your code could look like:

<h:outputText value="#{cc.attrs.appreciatedByCurrentUser ?  (''.concat(cc.attrs.count).concat('&lt;br/&gt;').concat(cc.attrs.count-1)) :  (''.concat((cc.attrs.count+1)).concat('&lt;br/&gt;').concat(cc.attrs.count))}" escape="false" />

In this particular case however I would go with one of the options that Mr BalusC had suggested because the code above doesn’t look quite elegant. In some cases knowing this technique could be useful, though.

I would hardly recommend using javascript as a workaround here.