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(Photo: leaf pile by oeimah)

Sometimes in a JSP/DSP page you will want to get the size of a collection and unless you are within a Range, ForEach or similar droplet you won’t have access to this value.

Struts has a nice solution using the " href="http://struts.apache.org/1.3.8/struts-taglib/tagreference.html#size">" href="http://struts.apache.org/1.3.8/struts-taglib/tagreference.html#size">" href="http://struts.apache.org/1.3.8/struts-taglib/tagreference.html#size"><bean:size> tag.  JSTL 1.1 has a nice solution using the fn:length function.

Here is an example of how to use Struts, DSPEL and JSTL to get the size of a collection.

  <dspel:getvalueof param="book.pages" var="pages"
                    vartype="java.util.Collection"/>
  <bean:size id="numPages" name="pages"/>
  Number of Pages: <c:out value="${numPages}"/>
  Number of Pages: <dspel:valueof value="${numPages}"/>

Here is an example of how to use JSTL 1.1 and DSPEL to get the size of a collection.

  <dspel:getvalueof param="book.pages" var="pages"
                    vartype="java.util.Collection"/>
  Number of Pages: <c:out value="${fn:length(pages)}"/>

Related posts:

1. Trim White Space from JSP
2. ATG ForEach Output with Separators Between Items
3. Jumping to different parts of a page using a dropdown
4. Accessing RepositoryItems with JSTL
5. Comparison of DSP and DSPEL