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Posted to users@tomcat.apache.org by "Collins, Jim" <ji...@nomura.co.uk> on 2001/02/02 11:38:36 UTC
Problem with tags that set scripting variables

Hi,

I have writen a very simple tag and jsp, what I want to do is set a
scripting variable in the tag. Below is the jsp, taglib, and tag handler.
When I try and run the jsp it throws a JasperException saying that test is
an undefined variable. I have looked at the generated code and I can see
that the variable is out of scope when I use it in the script but I don't
know how to give it scope throughout the page. Any help with this would be
greatly appreciated as I am pulling my hair out trying to figure out how to
get it to work.

Thanks.

Jim.

//the jsp file
<%@ page language="java" import="java.util.Date" %>
<html>
<head>
<title>Test</title>
</head>
<body>
<%@ taglib uri="http://java.apache.org/tomcat/examples-taglib" prefix="mars"
%>
<mars:id cp_name="test"/>
<%= test %>
</body>
</html>


//the taglib
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
        PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
        "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">

<!-- a tag library descriptor -->

<taglib>
  <!-- after this the default space is
        "http://java.sun.com/j2ee/dtds/jsptaglibrary_1_2.dtd"
   -->
  <tlibversion>1.0</tlibversion>
  <jspversion>1.1</jspversion>
  <shortname></shortname>

  <!-- mars dets -->
  <tag>
    <name>id</name>
    <tagclass>UK.co.nomura.mars.utils.MarsDets</tagclass>
    <teiclass>UK.co.nomura.mars.utils.MarsDetsExtraInfo</teiclass>
    <bodycontent>empty</bodycontent>
    <info>
    </info>
    <attribute>
      <name>cp_name</name>
      <required>true</required>
      <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
</taglib>


//the tag handler
public class MarsDets extends TagSupport{

  public void setCp_name(String name){
    this.cp_name = name;
  }

  public String getCp_name(){
    return cp_name;
  }

  public int doStartTag() throws JspTagException {
      pageContext.setAttribute(cp_name, "test");
      return SKIP_BODY;
  }
 public int doEndTag() throws JspTagException{
    return EVAL_PAGE;
  }
 private String cp_name;
}


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