How do I check two conditions in one <c:if>?

问题

How do I check two conditions in one <c:if>? I tried this, but it raises an error:

<c:if test="${ISAJAX == 0} && ${ISDATE == 0}"> 

回答1:

This look like a duplicate of JSTL conditional check.

The error is having the && outside the expression. Instead use

<c:if test="${ISAJAX == 0 && ISDATE == 0}">

回答2:

If you are using JSP 2.0 and above It will come with the EL support: so that you can write in plain english and use and with empty operators to write your test:

<c:if test="${(empty object_1.attribute_A) and (empty object_2.attribute_B)}">

回答3:

Recommendation:

when you have more than one condition with and and or is better separate with () to avoid verification problems

<c:if test="${(not validID) and (addressIso == 'US' or addressIso == 'BR')}">

回答4:

Just in case somebody needs to check the condition from session.Usage of or

<c:if test="${sessionScope['roleid'] == 1 || sessionScope['roleid'] == 4}">

来源：https://stackoverflow.com/questions/8355787/how-do-i-check-two-conditions-in-one-cif