How to check null and empty condition using Thymeleaf in one single operation?

java thymeleaf isnullorempty

Pradeep · Jul 12, 2018 · Viewed 43.6k times · Source

Is there any way to check both null and empty condition in Thymeleaf?

Approach 1

1) .variable1?.variable2?.variable3
2) variable!=null 
3) variable!=''

If we combine two conditions like (variable!='' And variable!=null) I am having issue when rendering.

I am trying following sample

${#strings.concat(#strings.concat('class ',variable1?.variable2), ' ', variable1?.variable2?.variable3)}

I also used containsKey as well but it is behaving differently.

Answer

Try ${#strings.isEmpty(variable)}.

/*
 * Check whether a String is empty (or null). Performs a trim() operation before check
 */
${#strings.isEmpty(name)}