JSTL Core Tag c:param Example

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Last Updated on 31 August 2019   |   Print  Email


In this post, you will learn how to use the <c:param> tag in the JSTL core tags library with code examples.

The <c:param> tag works in conjunction with <c:url> tag. We use <c:param> tag to provide request parameters and associated values to a <c:url> tag. The <c:param> tag is nested in <c:import>, <c:url> and <c:redirect> tag to supply request parameters.

 

JSTL <c:param> Syntax:

<c:param name="<string>" value="<string>"/>

 

Attributes:

Name

Required

Type

Description

name

True

java.lang.String

Name of the request query string parameter.

value

False

java.lang.String

Associated value of the parameter.

 

JSTL <c:param> Example:

The below code example sends two parameters to the URL using the <c:param> tag.

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
    "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
      <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
      <title>&lt;c:param&gt; Demo</title>
    </head>
    <body>
        <h1>&lt;c:param&gt; Demo</h1>
        <c:url var="myURL" value="/tag-types/core/param.jsp">
        <c:param name="param1" value="value1"/>
          <c:param name="param2" value="value2"/>
       </c:url>
      <a href="/<c:out value="${myURL}"/>">
         Click to send two test parametets and values using &lt;c:param&gt;</a>
     <br/>
    <br/>
    <c:if test="${not empty param.param1 && not empty param.param2}">
      Param1 
      <c:out value="${param.param1}"/><br/>
      Param2
      <c:out value="${param.param2}"/>
    </c:if>
  </body>
</html>

The below example creating an URL with one request parameter and associated value to get the details of the item. <c:import> tag using the URL to display the item details.

<c:url value="/getItemDetails.jsp" var="itemDetailsURL">
   <c:param name="itemId" value="I1980X"/>
   </c:url>
<c:import url="${ itemDetailsURL }"/>

 

Eventually, the URL will be evaluated like shown below:

"/getItemDetails.jsp?itemId=I1980X"
 

Output:

param-demo

In the above screen capture, clicking on the link sends two parameters with values. Please note the URL change after the submission.

 

Recommended Usage of JSTL <c:param> tag:



Useful to send parameters and associated values to a resource specified in the <c:url> tag.

 

Other JSTL Core Tags:

if |  catch  |  choose   |  forEach  |  forTokens   |  import   |  out   |  redirect  |  remove   |  set  |  url


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