I do not know off hand what the relevant JSP spec says about runtime expressions in tag attributes (maybe Hans can chime in, if he's on this list), but what you described matches my experience under the web container provided by Weblogic 6.1. It should be trivial, especially in the example you provided, to do the string concat in your scriptlet rather than trying to pass a value to a custom tag that is half regular text and half runtime expression. One trick we've used is
<my:MyTag name="<%=userName + "_guest" %>"/> which gets around this seemingly odd limitation of tag attributes. Don't confuse HTML tags with JSP tags. JSP tags are run through a translation phase, where rules like where runtime attributes can be used, what attributes are required, etc. are enforced. The output of translation is Java source code that is compiled. All HTML tages ultimately just end up as literals in println() calls in that source code, or the equivalent. That is, HTML tags don't have to obey any special rules in the JSP translation phase, unlike JSP tags, because they are part of what the JSP spec refers to as template text--that HTML could just as easily be XML or WML or a csv file or any other kind of text, the JSP container doesn't care. Thomas Gideon Sr. Software Developer B2eMarkets 301.230.2236 Tel. 301.230.2248 Fax. [EMAIL PROTECTED] www.B2eMarkets.com > -----Original Message----- > From: shanmugampl [mailto:[EMAIL PROTECTED]] > Sent: Friday, September 27, 2002 8:24 AM > To: [EMAIL PROTECTED] > Subject: Issue in giving runtime expression for custom tag attributes > > > Hi All, > > I am developing some custom tags for my application. > For one of > my tag attributes i have the rtexprvalue set to true. The following > scenario does not work > > Usage: > <% > String userName = "Shan" > %> > <my:MyTag name="<%=userName%>_guest"/> > > When i see the generated code, the value for userName is not > replaced, > and the whole expression is considered as a String and passed to the > method. > i.e the setName method is called as setName("<%=userName%>_guest"); > > but the result i expected was > setName(userName+"_guest"); > > The same thing works fine if i give it as > > <my:MyTag name="<%=userName%>"/> > > and the generated result was setName(userName); > > Is this a bug or the expected functionality because for > other html tags > such as input i can specify it as > > <input value="text<%=userName%>"/> > > Thanks > Shanmugam.PL > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
