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Struts2 Data Tags

Output of the includeTag.jsp


5. Param Tag (Data Tag) Example

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 behave 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/dataTags/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 Example</title>
</head>
<body>
<h2>Param Tag Example</h2>
<ui:component>
<ui:param name=”empname”>Emp1</
ui:param><br>
<ui:param name=”empname”>Emp2</
ui:param><br>
<ui:param name=”empname”>Emp3</
ui:param>
</ui:component>
</body>
</html>

Jan 2008 | Java Jazz Up | 47
 
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