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Parameter Tag:
Posted on: January 10, 2008 at 12:00 AM
bean:parameter Tag -is used to define a scripting variable based on the value(s) of the specified request parameter.

Parameter Tag:

     

bean:parameter Tag -is used to define a scripting variable based on the value(s) of the specified request parameter.

This tag retrieve the value of the specified request parameter and define the attribute of  type String or String[] in page scope.

Note : If there is  no any  request parameter with the specified name can be located, and no default value is specified, a request time exception will be thrown.

Name Description
id

This Attribute specifies the name of the scripting variable (and associated page scope attribute) that will be made available with the value of the specified request parameter.
multiple

If any arbitrary value for this attribute is specified, causes a call to ServletRequest.getParameterValues() and a definition of the result as a bean of type String[]. Otherwise, ServletRequest.getParameter() will be called, and a definition of the result as a bean of type String will be performed.
name

Specifies the name of the request parameter whose value, or values, is to be retrieved.
value

The default parameter value to return if no parameter with the specified name was included in this request.

Example Illustrating the use of the Page<bean:parameter> tag.
Here you will learn to use the Struts Html <bean:parameter>tag. 
We will cover an example that will show a working of<bean:parameter>tag.
Example code :
 Creating an Action Class    : Not Required here.
Creating Form Bean   : Not Required here.
Developing the Action Mapping in the struts-config.xml   : Not Required here.
Developing the beanParameterTag.jsp page :

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic"%>
<html>
  <head>
  <title>Demo Of struts-bean:parameter Tag</title>
  </head>
  <body bgcolor="#999933">
  <div align="center">
  <h2>Demo Of struts-bean:parameter Tag</h2>
  </div>
  <pre>
  <font color="#33FF33"><p>If called from the 
  <code>index.html</code>page, two request parameters will be included and
    their values displayed below.
  If you call this page without including the appropriate request
    parameters, you will receive a JSP runtime error instead.
  </p></font>
  </pre>
  <bean:parameter id="param1" name="param1" />
  <bean:parameter id="param2" name="param2" />
  <bean:parameter id="param3" name="param3" value="NOTKNOWN" />
  <table border="2">
  <tr>
  <th><font color="#33FF33">Parameter Name</font></th>
  <th>
  <font color="#33FF33">Requested Parameter values</font>
  </th>
  </tr>
  <tr>
  <td><font color="#33FF33">param1</font></td>
  <td>
  <%= param1 %>
  </td>
  </tr>
  <tr>
  <td><font color="#33FF33">param2</font></td>
  <td>
  <%= param2 %>
  </td>
  </tr>
  <tr>
  <td><font color="#33FF33">param3</font></td>
  <td>
  <%= param3 %>
  </td>
  </tr>
  </table>
  </body>
</html>
 

Add the following line in the index.jsp to call the form.

<a href="beanParameterTag.jsp?param1=ParamValue1&param2=ParamValue2">
  beanParameterTagDemo
</a><br/>

Building and Testing the Example 
Build , deploy and Test  the application . 
Open the browser and navigate to the beanParameterTag.jsp page
Your browser displays the following page beanParameterTag.jsp and see the output.


Output:



Above actions displays the working of beanParameterTag..

     

Related Tags for Parameter Tag::
c,  string,  exception,  time,  io,  scope,  type,  request,  default,  page,  value,  tag,  parameter,  name,  attribute,  this,  row,  define,  if,  ie,  with,  ram,  ci,  e,  il,  throw,  it,  not,  can,  trie,  ul,  pe,  im,  ce,  fault,  in,  no,  m,  par,  tr,  ca,  locate,  es,  spec,  retrieve,  age,  loc,  me,  hr,  param,  cat,  s,  sp,  at,  any,  quest,  is,  ime,  ll,  meter,  note,  except,  and,  ar,  cop,  str,  va,  tt,  sco,  s,  s,  ri,  ring,  th,  st,  alu,  efault,  fin,  nd,  on,  o

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