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Asked: 2026-05-11T06:31:02+00:00

Is there a way to use something like deferred EL in JSP 2.0 /

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Is there a way to use something like deferred EL in JSP 2.0 / J2EE 1.4? The idea is to pass a test to a tag file and have it display an item in a list (or not) based on the value of the expression. Basically, I’d like to do something like this:

JSP:

<x:myTag items='${myCollection}' test='${item.visible}'/>

myTag.tag

<c:forEach var='item' items='${collection}'>     <c:if test='${test}'>         ${item}     </c:if> </c:forEach>

Upgrading our JSP container is not an option. Any ideas?

Update:

I tried doing this with JSP fragments, but the EL in the fragment was evaluated once in the JSP, rather than once per iteration in the tag.

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1 Answer

  1. You should be able to do this with jsp fragments. I believe it will not be the extremely elegant solution you would appreciate, but it does allow the execution of the expression to be deferred until inside the tag.

    Edit: You could check out the variable with the ‘name-given’ setting.

    (I will readily admit I did something like what you’re trying to do about 2 years ago. I have not touched it since. I remember I thought it was quite arcane)

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