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Struts2 - Param Tag (Data Tags)

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.
1. name (String) - the name of the parameter
2. 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.
AmitHere the value would be evaluated to the stack as a java.lang.String object.

Case 2.
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:

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