How to use if else condition in jsf to display image

Question

I have a condition where I have an enrollment form in which if userid is 0 it should show the dummy image and when I edit user from any update, I check for if userid which is not equal to 0 then display the image corresponding to userid.

I used JSTL inside jsf page. But always it tries to go to else loop for showing image. The functionality is working fine. The only thing is I can't display the dummy image when I visit the page first. Here s my code.:

<c:if test="${'#{user.userId}' == '0'}">
  <a href="Images/thumb_02.jpg" target="_blank" ></a>
  <img src="Images/thumb_02.jpg" />
</c:if>
<c:otherwise>
  <a href="/DisplayBlobExample?userId=#{user.userId}" target="_blank"</a>
  <img src="/DisplayBlobExample?userId=#{user.userId}" />
</c:otherwise>

Can I use this JSTL tag or can I do it using jsf?

User · Answer

For those like I who just followed the code by skuntsel and received a cryptic stack trace, allow me to save you some time.

It seems c:if cannot by itself be followed by c:otherwise.

The correct solution is as follows:

<c:choose>
    <c:when test="#{some.test}">
        <p>some.test is true</p>
    </c:when>
    <c:otherwise>
        <p>some.test is not true</p>
    </c:otherwise>
</c:choose>

You can add additional c:when tests in as necessary.

User · Answer

It is illegal to nest EL expressions  you should inline them  Using JSTL is perfectly valid in your situation  Correcting the mistake  you ll make the code working    lt html xmlns  http   www w3 org 1999 xhtml  xmlns c  http   java sun com jstl core  gt       lt c if test    not empty user or user userId eq 0   gt           lt a href  Images thumb 02 jpg  target   blank   gt  lt  a gt           lt img src  Images thumb 02 jpg    gt       lt  c if gt       lt c if test    empty user or user userId eq 0   gt           lt a href   DisplayBlobExample userId   user userId   target   blank  gt  lt  a gt           lt img src   DisplayBlobExample userId   user userId     gt       lt  c if gt   lt  html gt    Another solution is to specify all the conditions you want inside an EL of one element  Though it could be heavier and less readable  here it is    lt a href    not empty user or user userId eq 0     Images thumb 02 jpg      DisplayBlobExample userId     not empty user or user userId eq 0        user userId   target   blank  gt  lt  a gt   lt img src    not empty user or user userId eq 0     Images thumb 02 jpg      DisplayBlobExample userId     not empty user or user userId eq 0        user userId   target   blank  gt  lt  img gt

User · Answer

Instead of using the  c  tags  you could also do the following    lt h outputLink value  Images thumb 02 jpg  target   blank  rendered    not empty user or user userId eq 0     gt   lt h graphicImage value  Images thumb 02 jpg  rendered    not empty user or user userId eq 0     gt    lt h outputLink value   DisplayBlobExample userId   user userId   target   blank  rendered    not empty user and user userId neq 0     gt   lt h graphicImage value   DisplayBlobExample userId   user userId   rendered    not empty user and user userId neq 0    gt    I think that s a little more readable alternative to skuntsel s alternative answer and is utilizing the JSF rendered attribute instead of nesting a ternary operator  And off the answer  did you possibly mean to put your image in between the anchor tags so the image is clickable

[jsf-2] How to use if, else condition in jsf to display image

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