Skip to main content

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:

Labels:

Popular posts from this blog

Struts2 - Textfield Tag (Form Tags)

In this section, we are going to describe the textfield tag. The textfield tag is a UI tag that is used to render an HTML input field of type text. Add the following code snippet into the struts.xml file. struts.xml <action name="submitTag">   <result>/pages/uiTags/submitTag.jsp</result> </action> Create a jsp using the tag <s:textfield >  that renders an HTML input field of type text. <s:textfield label="Employee Name" name="empname" size="15" maxlength="10" /> tag displays an HTML text field with label equal to Employee Name with length of 15 columns. textfieldTag.jsp <%@ taglib prefix="s" uri="/struts-tags" %> <html>   <head>   <title>Textfield Tag Example</title>   </head>   <body>   <h1><span style="background-color: #FFFFcc">Tex...
Post a Comment
Read more

Struts2 - Radio Tag (Form Tags)

In this section, we are going to describe the radio tag. The radio tag is a UI tag that renders a radio button input field. Add the following code snippet into the struts.xml file. struts.xml <action name="radioTag" class="net.struts2.checkboxlistTag">   <result>/pages/uiTags/radioTag.jsp</result> </action> Create an action class with two lists as shown below: checkboxlistTag.java package net.struts2; import com.opensymphony.xwork2.ActionSupport; import java.util.*; public class checkboxlistTag extends ActionSupport{      private List fruits;   private List animals;     public String execute()throws Exception{   fruits = new ArrayList();   fruits.add("Apple");   fruits.add("Mango");   fruits.add("Orange");   fruits.add("Pine Apple");  ...
Read more

Struts2 - Optgroup Tag (Form Tags)

In this section, we are going to describe the optgroup tag. The optgroup tag is a UI tag that creates an optgroup component which needs to reside within a select tag <s:select>. Add the following code snippet into the struts.xml file. struts.xml <action name="optgroupTag">    <result>/pages/uiTags/optgroupTag.jsp</result> </action> Create a jsp using the tag <s:optgroup> within the <s:select> tag. It creates an optgroup component. This tag contains few parameters: The label parameter sets the label attribute In our case we have set it to " Hardware " and " Software ". optgroupTag.jsp <%@ taglib prefix="s" uri="/struts-tags" %> <html>   <head>   <title>Optgroup Tag Example!</title>    </head>   <body>  <h1><span style="background-color: #FFFFcc">Optgroup Tag Ex...
Read more