Why is it necessary to trim before comparing string data?

Asked Oct 30 '18 at 13:26

Active Oct 30 '18 at 14:47

Viewed 32 times

There is a collection :

<c:set var = "tab" scope = "session" value = "${listIndicateurANN}" />

I loop it and make a test :

<c:forEach items="${tab}" var="obj" >
    <c:if test="${fn:trim(obj[12]) eq 'T'}">

Although the data obj[12] 's length is 1 ! So why ?

edited Oct 30 '18 at 14:47

asked Oct 30 '18 at 13:26

pheromix

Is this the real code? You've a typo there which makes it to always evaluate true. Please copypaste the MCVE unmodified. – BalusC Oct 30 '18 at 14:23
sorry , it s corrected now , I copied the exact code ! – pheromix Oct 30 '18 at 14:47
2

Most likely `obj[12]` is simply not a `java.lang.String`. To figure out what type exactly it is, print `${obj[12]['class'].name}`. – BalusC Oct 30 '18 at 14:53
after displaying `${obj[12]['class'].name}` it gives `java.lang.Character` ; so how to make the test correctly ? – pheromix Oct 31 '18 at 11:17
Compare with a char instead of a string, or convert char to string first as you did with fn:trim ;) – BalusC Oct 31 '18 at 11:37
I dont know ! Are there different functions to make test if it is char or String ? – pheromix Oct 31 '18 at 11:50
See the abovelinked dupe. – BalusC Oct 31 '18 at 13:06

0 Answers0