Dynamically assigning IDs to tags using an EL variable

Question

I want to loop over a number of \"guests\" and insert an id dynanimally

Answer 1

You cannot use EL expressions in the id attribute.

But you don't need to care for the uniqueness of your ids in ui:repeat. JSF does it for you. Just give your input field a "fixed" id and reference it in your p:message:

<ui:repeat value="#{guestList}" var="guest">
    <p:inputText id="firstname" value="" label="Firstname" />
    <p:message for="firstname" />
</ui:repeat>