Highlight text in JSTL

问题

I need to display text using JSTL. There are two arrays.

array a [one, two, three, nine] array b [nine, one, two]

The displayed text should bold the elements in a that are also in b and leave the rest normal

one, two, three, nine

<c:forEach var="i" items="${a}">
              <c:forEach var="j" items="${b}">
                  <c:choose>
                      <c:when test="${i==j}">
                          <strong><c:out value="${i}"/></strong>
                      </c:when>
                      <c:when test="${i!=j}">
                           <c:out value="${i}"/>
                      </c:when>
                  </c:choose>
              </c:forEach>
          </c:forEach>

What am i missing? The code displays one highlighted and then normal 3 times

回答1:

The second <c:when> should be a <c:otherwise>.

You probably meant to put the <strong> and </strong> around one of the <c:out>.

Also, your code would output 4 * 3 = 12 values. Is that what you intended?
If not, perhaps changing b to a List or Set, and using b.contains(i) would be what you want.

---

Update

If b is a Collection, preferably a Set, then this will do:

<c:forEach var="i" items="${a}">
    <c:choose><c:when test="${b.contains(i)}">
        <strong><c:out value="${i}"/></strong>
    </c:when><c:otherwise>
        <c:out value="${i}"/>
    </c:otherwise></c:choose>
</c:forEach>

来源：https://stackoverflow.com/questions/35022587/highlight-text-in-jstl