How can I hide when it is empty

Question

I am working on a user login form. It is on my "home.html" ,

I want to show the username after login(when I get session datas form

"login.html" by "Httpsession")

Otherwise just hide when it is empty.

<span th:text="${user.name}" id="uname"></span>

When it is empty, I have an error message like this:

EL1007E: Property or field 'name' cannot be found on null.

Thanks.

If you are using Spring, you can use the safe navigation operator - see [here](https://stackoverflow.com/questions/20636456/using-thymeleaf-when-the-value-is-null) for an example. Otherwise, you can use Thymeleaf's `th:if` tag - see [here](https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf#simple-conditionals-if-and-unless). — andrewJames, Jun 04 '20 at 16:06

score 2 · Accepted Answer · answered Jun 05 '20 at 05:52

2

Use th:if to conditionally include the <span>:

<span th:if="${user?.name}" th:text="${user.name}" id="uname"></span>

To avoid the NullPointerException, use the Safe Navigation Operator: ?..

answered Jun 05 '20 at 05:52

Wim Deblauwe

It works! Thx!!And there is no NullPointerException ^ ^ – Shayimerdan Jun 05 '20 at 06:40

1 Answers1