Concatenating strings in EL

问题

The following keeps returning null any idea why

<ui:param name="dialogName" value="#{index.toString().concat('Overlay')}" />

回答1:

Just do this:

<ui:param name="dialogName" value="#{cc.attrs.xProd.product.productId}Overlay" />

See also:

• Concatenating Strings within EL expression

来源：https://stackoverflow.com/questions/11302236/concatenating-strings-in-el