Param Tag (Data Tag) Example

In this section, we are going to describe the param tag. The param tag is a generic tag that is used to parameterize other tags. For example the include tag and bean tag. The parameters can be added with or without a name as a key.

The param tag has the following two parameters.

name (String) - the name of the parameter
value (Object) - the value of the parameter

Note: When you declare the param tag, the value can be defined in either a value attribute or as text between the start and end tag.
Struts behaves a bit different according to these two situations.

Case 1. <param name="empname">Amit</param> Here the value would be evaluated to the stack as a java.lang.String object.
Case 2. <param name="empname" value="Vinod"/> Here the value would be evaluated to the stack as a java.lang.Object object.

Add the following code snippet into the struts.xml file.

struts.xml

<action name="paramTag">
<result>/pages/genericTags/paramTag.jsp</result>
</action>

Now create a jsp page to see the working of the param tags.

paramTag.jsp


<%@ taglib prefix="s" uri="/struts-tags" %>



<html>

  <head>

    <title>Param Tag (Data Tag) Example</title>

  </head>

  <body>

    <h1><span style="background-color: #FFFFcc">Param Tag 

                  
(Data Tags) Example!</span></h1>

      <ui:component>

        <ui:param name="empname">Vinod</ui:param><br>

        <ui:param name="empname">Amit</ui:param><br>

        <ui:param name="empname">Sushil</ui:param> 

      </ui:component>

  </body>

</html>

Output of paramTag.jsp: