Concatenation in JSF expressions (EL)

Question

Hi, does anyone know if something like is possible ? (problem is that I would like different texts for different rows in a datatable using a message bundle)
<h:outputText value="'page1' + msg[somevariable] + 'extra text'"></h:outputText>
Appreciate some help.
Thanks

Answer 1

You can't concat values in [ ].
I use a bean do do the concatenation :
<h:outputText value="#{lang[concat['mpr.canton.,#offer.canton']]}"/>
Source :
public class ConcatenationBean extends HashMap
    // log4j static Logger for this class
    private static final Logger logger = Logger.getLogger(ConcatenationBean.class);
    public ConcatenationBean()
        super();
     * Concat the string separated by a comma Evaluate JSF EL expression if
     * token begin by # or $
     * @param inObject :
     *            is the list of string to concat separated by a comma. return a
     *            String exemple : <h:outputText
     *            value="#{lang[concat['mpr.canton.,#offer.canton']]}"/>
    public Object get(Object inObject)
        StringBuffer resultBuffer = new StringBuffer();
        try
            String inToken = (String) inObject;
            StringTokenizer tok = new StringTokenizer((String) inToken, ",", false);
            while (tok.hasMoreTokens())
                String token = tok.nextToken().trim();
                if (logger.isDebugEnabled())
                    logger.debug("inToken=" + token);
                if (token.startsWith("#{"))
                    Object tokenEvaluated = FacesHelper.getElValue(token);
//                    if (tokenEvaluated instanceof String)
                        resultBuffer.append(String.valueOf(tokenEvaluated));
//                    else
//                        logger.error("#{...} EL expression is not a String : " + token);
                else if (token.startsWith("${"))
                    token = token.substring(2, token.length() - 1);
                    if (logger.isDebugEnabled())
                        logger.debug("token $ =" + token);
                    Object tokenEvaluated = FacesHelper.getElValue(FacesHelper.getJsfEl(token));
//                    if (tokenEvaluated instanceof String)
                        resultBuffer.append(String.valueOf(tokenEvaluated));
//                    else
//                        logger.error("${...} EL expression is not a String : " + token);
                else if (token.startsWith("#"))
                    token = token.substring(1);
                    Object tokenEvaluated = FacesHelper.getElValue(FacesHelper.getJsfEl(token));
//                    if (tokenEvaluated instanceof String)
                        resultBuffer.append(String.valueOf(tokenEvaluated));
//                    else
//                        logger.error("#... expression is not a String : " + token);
                else
                    resultBuffer.append(token);
        catch (Throwable e)
            logger.error(null, e);
        return resultBuffer.toString();
}I hope it will help you...