How can I validate if a String
is null or empty using the c
tags of JSTL
?
I have a variable of name var1
and I can display it, but I want to add a comparator to validate it.
<c:out value="${var1}" />
I want to validate when it is null or empty (my values are strings).
How can I validate if a String is null or empty using the c tags of JSTL?
You can use the empty
keyword in a <c:if>
for this:
<c:if test="${empty var1}">
var1 is empty or null.
</c:if>
<c:if test="${not empty var1}">
var1 is NOT empty or null.
</c:if>
Or the <c:choose>
:
<c:choose>
<c:when test="${empty var1}">
var1 is empty or null.
</c:when>
<c:otherwise>
var1 is NOT empty or null.
</c:otherwise>
</c:choose>
Or if you don't need to conditionally render a bunch of tags and thus you could only check it inside a tag attribute, then you can use the EL conditional operator ${condition? valueIfTrue : valueIfFalse}
:
<c:out value="${empty var1 ? 'var1 is empty or null' : 'var1 is NOT empty or null'}" />
To learn more about those ${}
things (the Expression Language, which is a separate subject from JSTL), check here.