Joe, Henrique & Robert: Thank you for replies, they all works :) yours, lei
On Mon, May 24, 2004 at 03:38:54PM -0500, Joe Germuska wrote: > At 1:44 PM +0800 5/22/04, Ding Lei wrote: > >Hello all, > > There is an array(dsmccList) obtained by a self-defined tag, > >and I wanna to send the length of the array > > as an hidden property, as following: > > <iPanel:appListData id='dsmccList'/> > > <c:set var="dataCount" value="${dsmccList.length}"/> > > > > But this causes exception: > >javax.servlet.jsp.el.ELException: The "." operator was supplied with > >an index value of type "java.lang.String" to be applied to a List or > >array, but that value cannot be converted to an integer. > > In JSTL 1.1 (JSP 2.0), you can use the 'length' function: > http://java.sun.com/products/jsp/jstl/1.1/docs/tlddocs/fn/length.fn.html > > Short of that, no, there is no convenient way to do what you suggest > without writing scriptlets. The JSTL Expression language expects the > value to the right of a "." operator to be a bean property name, and > neither arrays nor collections have methods that conform to bean > property naming conventions that help you do this. > > Actually, rather than writing scriptlets, I usually define a second > request-scoped variable that holds the length, or wrap the list in a > bean of my own that translates between "getLength()" and array.length > or collection.size() > > Maybe you can adjust your custom tag to define two variables, the > list and another with the length of the list. > > Joe > > -- > Joe Germuska > [EMAIL PROTECTED] > http://blog.germuska.com > "Imagine if every Thursday your shoes exploded if you tied them > the usual way. This happens to us all the time with computers, and > nobody thinks of complaining." > -- Jef Raskin > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > -- Yours, <<<::::: D i n g L e i ::::::>> || || || Ext: 8106 || || Email: <dinglei [A] ipanel [O] cn> || || Dept. Of Technology/Engineering || || Embedded Information Services Inc. || || || <(((((( ===================== )))))>>> A child of five could understand this! Fetch me a child of five. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]