Thanks for the reply But actually what I wanted is to be able to get data from the tag that uses the ExtraInfo tag. If I got everything right from this documentation it's impossible. All I can get is the tag's attributes set in the jsp... pretty useless for what I want to do. I can't get pagecontext in the ExtraInfo class too...
On Thu, 2002-09-12 at 17:05, Craig R. McClanahan wrote: > Felipe, > > You would probably make progress faster by working your way through a > tutorial on building custom tags. One such document is included in the > tutorial for the Java Web Services Developer Pack: > > http://java.sun.com/webservices/docs/1.0/tutorial/index.html > > In particular, you'll want to read "Custom Tags in JSP Pages", and the > section there called "Cooperating Tags". It sounds like you might find > the various topics on servlet and JSP programming, as well as web > applications, useful in order to get grounded in the fundamentals. > > Although the tutorial uses JWSDP to run its examples, the concepts all > apply to development for Tomcat use directly as well. > > Craig > > On 12 Sep 2002, Felipe Schnack wrote: > > > Date: 12 Sep 2002 16:59:44 -0300 > > From: Felipe Schnack <[EMAIL PROTECTED]> > > Reply-To: Tomcat Users List <[EMAIL PROTECTED]> > > To: Tomcat Users List <[EMAIL PROTECTED]> > > Subject: Re: registering variables > > > > I still can't understand this very well. > > data.getAttributeString("name") should return the value of the "name" > > attribute of the taglib, right? > > > > On Thu, 2002-09-12 at 15:24, Nic Holbrook wrote: > > > Yes, this can be done. > > > > > > Tag example > > > > > > import javax.servlet.jsp.*; > > > import javax.servlet.jsp.tagext.*; > > > import java.io.*; > > > > > > public class Dummy extends BodyTagSupport > > > { > > > protected String name; > > > protected boolean result; > > > > > > public Dummy() > > > { > > > initValues(); > > > } > > > public void release() > > > { > > > initValues(); > > > } > > > private void initValues() > > > { > > > name = ""; > > > result = false; > > > } > > > > > > public void setResult(boolean result) > > > { > > > this.result = result; > > > } > > > public boolean getResult() > > > { > > > return result; > > > } > > > > > > public void setName(String p1) > > > { > > > name = p1; > > > } > > > public String getName() > > > { > > > return name; > > > } > > > > > > public int doStartTag() throws JspTagException > > > { > > > pageContext.setAttribute(name, new Boolean(result)); > > > return(BodyTag.EVAL_BODY_BUFFERED); > > > } > > > } > > > > > > Example Tag Extra Info > > > > > > > > > import javax.servlet.jsp.*; > > > import javax.servlet.jsp.tagext.*; > > > > > > public class DummyExtraInfo extends TagExtraInfo > > > { > > > public static final String ATTRIB_NAME = "name"; > > > public static final String ATTRIB_TYPE = "java.lang.Boolean"; > > > > > > public VariableInfo[] getVariableInfo(TagData data) > > > { > > > if(data.getAttributeString(ATTRIB_NAME) != null) > > > { > > > VariableInfo info = new > > > VariableInfo(data.getAttributeString(ATTRIB_NAME), ATTRIB_TYPE, true, > > > VariableInfo.AT_BEGIN); > > > return new VariableInfo[] { info }; > > > } > > > else > > > { > > > return new VariableInfo[] {}; > > > } > > > } > > > } > > > > > > > > > Hope this is what you were looking for. > > > > > > Later > > > > > > Nic > > > > > > Felipe Schnack wrote: > > > > > > > Well, actually I'm talking about the TagExtraInfo. With it, you can > > > >register variables in the tag scope... I would like to dinamically > > > >create these variables. > > > > I will not enter in details of why I want to do that, but it's > > > >relative to data access... > > > > It's possible or not? Maybe I can make a TagExtraInfo that grabs data > > > >from it related tag? That's possible? I mean, you have an > > > >"DoSomethingTag" and a "DoSomethingExtraInfoTag". It's possible to > > > >"DoSomethingExtraInfoTag" access ""DoSomethingTag" data? > > > > > > > >On Thu, 2002-09-12 at 12:36, Andreas Mohrig wrote: > > > > > > > > > > > >>I don't know Struts, but if it is possible to register variables in other > > > >>scopes with the help of Struts it gives me the creeps/makes me shudder and > > > >>would not shine a good light on Java as a programming language. Why should > > > >>you want to register a variable in the first place? Java is good for > > > >>encapsulation and information hiding. Data transport can be managed via > > > >>return values of method calls or if there is absolutely no other way over > > > >>global contexts (which is frightful by itself). What you are talking about > > > >>would undermine the foundations of the Java programming language (in my > > > >>humble opinion as a programmer). But I'm willing to learn and to broaden my > > > >>perspective, so if you have a case where it is absolutely necessary (or even > > > >>practically/elegant or otherwise useful) to do what you want to do, please > > > >>let me know about it. > > > >> > > > >>Andreas Mohrig > > > >> > > > >>-----Original Message----- > > > >>From: Felipe Schnack [mailto:[EMAIL PROTECTED]] > > > >>Sent: Thursday, September 12, 2002 5:16 PM > > > >>To: Tomcat Users List > > > >>Subject: RE: registering variables > > > >> > > > >> > > > >> Ok, but this is an attribute, not an variable really. There isn't a > > > >>way I can register a variable? Like in Strut's TE tags? > > > >> > > > >>On Thu, 2002-09-12 at 11:57, Andreas Mohrig wrote: > > > >> > > > >> > > > >>>You could put it in the pageContext (or even in the session or application > > > >>>context). That will require some syntactic clutter (first > > > >>> pageContext.setAttribute("variableName",objectVariable); > > > >>> then (in the jsp page) > > > >>> ObjectType myVariable = > > > >>>(ObjectType)pageContext.getAttribute("variableName",objectVariable); > > > >>>) > > > >>>and opens the possibilitie of errors that are hard to debug (what if there > > > >>>is already an attribute with that name?) but is much safer than directly > > > >>>creating variables in other scopes. It is one of javas merits that this is > > > >>>not possible (at least not to my knowledge). > > > >>> > > > >>>greetings > > > >>> > > > >>>Andreas Mohrig > > > >>> > > > >>>-----Original Message----- > > > >>>From: Felipe Schnack [mailto:[EMAIL PROTECTED]] > > > >>>Sent: Thursday, September 12, 2002 4:42 PM > > > >>>To: Tomcat Users List > > > >>>Subject: registering variables > > > >>> > > > >>> > > > >>> How can I create an variable within an taglib? I would like to be able > > > >>>to create an variable accesible to my jsp page. > > > >>> > > > >>>-- > > > >>> > > > >>>Felipe Schnack > > > >>>Analista de Sistemas > > > >>>[EMAIL PROTECTED] > > > >>>Cel.: (51)91287530 > > > >>>Linux Counter #281893 > > > >>> > > > >>>Faculdade Ritter dos Reis > > > >>>www.ritterdosreis.br > > > >>>[EMAIL PROTECTED] > > > >>>Fone/Fax.: (51)32303328 > > > >>> > > > >>> > > > >>>-- > > > >>>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]> > > > >> > > > >> > > > >>-- > > > >> > > > >>Felipe Schnack > > > >>Analista de Sistemas > > > >>[EMAIL PROTECTED] > > > >>Cel.: (51)91287530 > > > >>Linux Counter #281893 > > > >> > > > >>Faculdade Ritter dos Reis > > > >>www.ritterdosreis.br > > > >>[EMAIL PROTECTED] > > > >>Fone/Fax.: (51)32303328 > > > >> > > > >> > > > >>-- > > > >>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]> > > > >> > > > >> > > > >> > > > > > > > > > > > > > > > -- > > > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > > > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > > > > -- > > > > Felipe Schnack > > Analista de Sistemas > > [EMAIL PROTECTED] > > Cel.: (51)91287530 > > Linux Counter #281893 > > > > Faculdade Ritter dos Reis > > www.ritterdosreis.br > > [EMAIL PROTECTED] > > Fone/Fax.: (51)32303328 > > > > > > -- > > 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]> > -- Felipe Schnack Analista de Sistemas [EMAIL PROTECTED] Cel.: (51)91287530 Linux Counter #281893 Faculdade Ritter dos Reis www.ritterdosreis.br [EMAIL PROTECTED] Fone/Fax.: (51)32303328 -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
