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Java Forum / General / December 2006Problem with EL (Expression Language) in JST /JSP
Hi, I have a problem with JSTL EL (Expression Language) in JSP. The follow example show my problem.: <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <body> <% java.util.HashMap clients = new java.util.HashMap(); clients.put("1","John"); clients.put("2","Peter"); clients.put("3","Gerald"); clients.put("4","Nick"); request.setAttribute("clients",clients); %> <c:forEach var='clientnum' begin='1' end='4'> <br> Client Nº::${clientnum} </br> <br> Value:${requestScope.clients["${clientnum}"]} </br> </c:forEach> </body> </html> My code don't display the "clients" values... ¿Where is the problem? I don't want to use iteration, please.... Thanks in advance. The problem is with the nested expressions, which you shouldn't need. I think that Value:${requestScope.clients[clientnum]} should do the trick. > Hi, > [quoted text clipped - 29 lines] > I don't want to use iteration, please.... > Thanks in advance. Thanks, Steve. I try your solution, but I have same problem..... Steve ha escrito: > The problem is with the nested expressions, which you shouldn't need. I > think that [quoted text clipped - 36 lines] > > I don't want to use iteration, please.... > > Thanks in advance. I think the problem is that the forEach tag is generating a numeric type for the clientnum variable and the ${clients[clientnum]} syntax is failing to interpret the expression correctly because it can't use an int to index a map and isn't making the leap to try and coerce the value to a string. If you convert the clientnum to a string explicitly it will work: Add this at the top: <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> and use: Value: ${clients[fn:toLowerCase (clientnum)]} alternately, if the only information being carrier in the map keys is an integer perhaps a List would do? <% final List clients = new ArrayList (); clients.add ("John"); clients.add ("Peter"); clients.add ("Gerald"); request.setAttribute ("clients", clients); %> <c:forEach var="client" varStatus="status" items="${clients}"> ${status.count}: '${client}' <br/> </c:forEach> --lee > Thanks, Steve. > [quoted text clipped - 42 lines] > > > I don't want to use iteration, please.... > > > Thanks in advance. Thanks Lee, I try your solution, and it work's . Thanks!!!!! Lee Crawford ha escrito: > I think the problem is that the forEach tag is generating a numeric > type for the clientnum variable and the ${clients[clientnum]} syntax is [quoted text clipped - 75 lines] > > > > I don't want to use iteration, please.... > > > > Thanks in advance. Please don't top-post. (Post re-ordered for clarity.) Lee Crawford ha escrito: >> <c:forEach var="client" varStatus="status" items="${clients}"> >> ${status.count}: '${client}' <br/> >> </c:forEach> > Thanks Lee, > > I try your solution, and it work's [sic]. > > Thanks!!!!! Notice that their solution uses the short-form closed "<br/>" tag. - Lew >>> <br> >>> Client Nº::${clientnum} >>> </br> >>> <br> >>> Value:${requestScope.clients["${clientnum}"]} >>> </br> This is not a correct use of the <br> tag. It does not allow content. In other words, you do not surround text with a <br>. Your best bet is to use the short-form closed idiom: <br/>. - Lew Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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