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Java Forum / First Aid / May 2004tag-lib and JSTL expression library
Hallo, I have created a tag-lib. They ask me if it integrates with the JSTL expression library. In other words, I would like to be able to express this: <tag attribute="<% = somevar %> "/> as: <tag attribute="${value}"/> any articles/tutorials explaining how to achieve this? thanks l. > Hallo, I have created a tag-lib. They ask me if it integrates > with the JSTL expression library. [quoted text clipped - 12 lines] > > l. If you're using JSP 2.0, you don't have to do anything special to make use of the JSTL expressions. If you can't do that, you have to build-in support yourself. Look at how it's done in the Jakarta JSTL tags for an example.  SignatureKind regards, Christophe Vanfleteren > If you're using JSP 2.0, you don't have to do anything special to make use > of the JSTL expressions. If you can't do that, you have to build-in support > yourself. Look at how it's done in the Jakarta JSTL tags for an example. Thank you. Actually I am using Tomcat 4.1.18 and that's not JSP 2, is it? Also, I am building a general purpose tag-library. Are you telling me that I need to provide two verions of it? one for JSP 1.2 and one for JSP 2.0? thanks Luca >> If you're using JSP 2.0, you don't have to do anything special to make >> use of the JSTL expressions. If you can't do that, you have to build-in >> support yourself. Look at how it's done in the Jakarta JSTL tags for an >> example. > > Thank you. Actually I am using Tomcat 4.1.18 and that's not JSP 2, is it? 4.x doesn't support JSP 2 indeed. > Also, I am building a general purpose tag-library. Are you telling me > that I need to provide two verions of it? > one for JSP 1.2 and one for JSP 2.0? I'm afraid you'll have to if you want to use the EL in JSP 1.2 and still have your tag be usable with the EL in JSP 2. The JSTL taglibs also come in 2 flavors for the same reason. But technically, they are not a JSP 1.2 and JSP 2 version, but one that supports the runtime expressions and one that doesn't. SignatureKind regards, Christophe Vanfleteren > The JSTL taglibs also come in 2 flavors for the same reason. But > technically, they are not a JSP 1.2 and JSP 2 version, but one that > supports the runtime expressions and one that doesn't. is there any connection between JSP version and underlying Java version? luca >> The JSTL taglibs also come in 2 flavors for the same reason. But >> technically, they are not a JSP 1.2 and JSP 2 version, but one that >> supports the runtime expressions and one that doesn't. > > is there any connection between JSP version and > underlying Java version? No, AFAIK you can still run JSP 2 on JDK 1.3 (at least Tomcat 5 should). JSP 2 is part of the J2EE 1.4 specification though. SignatureKind regards, Christophe Vanfleteren >>I am building a general purpose tag-library. Are you telling me >>that I need to provide two verions of it? >>one for JSP 1.2 and one for JSP 2.0? > > I'm afraid you'll have to if you want to use the EL in JSP 1.2 and still > have your tag be usable with the EL in JSP 2. is there a way I can programmatically tell which JSP version I am into and build a TagLib that works with JSP1.2 and JSP2.0 alike? Thanks luca 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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