Iterating over ArrayList with c: foreach (JSP / JSTL), variable not working
There are tons of examples for my problem, I know, but I've gone through many of them and can't figure out where my mistake is.
I am iterating over ArrayList (TestSzenario). The TestSzenario class contains a named String variable with correct getters and setters.
Here's my code:
<td><select name="selectSzenario" id="selectSzenario" size="1">
<c:forEach items="<%=testszenario.getSzenariosForSummary() %>" var="szenario">
<option>${szenario.name}</option>
</c:forEach></select></td></tr>
My problem is that the variable is not working. I am getting $ {szenario.name} for each parameter in the select box. I have described the JSTL-taglib correctly, and since there are several options on the site, I know that iteration works. Also I looked in the HTML source code which is allowed for foreach.
HTML output:
<tr><td>Szenario:</td>
<td><select name="selectSzenario" id="selectSzenario" size="1">
<option>${szenario.name}</option>
<option>${szenario.name}</option>
</select></td></tr>
EDIT for answer 1: Thanks, but I've tried this before:
ArrayList<TestSzenario> szenarioList = testszenario.getSzenariosForSummary();
request.setAttribute("aList", szenarioList);
request.setAttribute("ts", testszenario);
<c:forEach items="${aList}" var="szenario">
<option>${szenario.name}</option>
</c:forEach></select></td></tr>
<c:forEach items="${ts.szenariosForSummary}" var="szenario">
<option>${szenario.name}</option>
</c:forEach></select></td></tr>
But in any case it doesn't even iterate over the list, and only one option appears as a result (the list contains 2 elements).
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<%=testszenario.getSzenariosForSummary() %>
converts the object to String
using a method String#valueOf(Object)
and writes it directly to the HTTP response. This is not what you want. Moreover, you should not mix oldschool scripts with modern taglibs / EL at all.
You need to make sure testszenario
EL is available ${}
. So, just set it as a Page, Request, Session or Application Scope attribute in advance in some kind of Servlet like
request.setAttribute("testszenario", testszenario);
Then you can just access it in the normal way:
<c:forEach items="${testszenario.szenariosForSummary}" var="szenario">
See also:
- How to avoid Java code in JSP files?
- Our Servlet Wiki Page - Hello World # 2 May Help You
- Our Wikilek page
Refresh . As for the problem where EL is not being interpreted, you apparently have a mismatch between the JSTL version and the container / web.xml
. Make sure the versions are correctly aligned. For example. Servlet container 3.0, version="3.0"
in web.xml
, JSTL 1.2. See also our JSTL wiki page.
See also:
- Our JSTL Wiki page - read the "Help! Expression Language (EL, those
${}
) doesn't work in my JSTL tags!"
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