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Select Tag<html:select>:

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html:select Tag : Creates a HTML <select> element, associated with a bean property specified by our attributes.
html:select Tag : Creates a HTML <select> element, associated with a bean property specified by our attributes.

Select Tag<html:select>:

     

html:select Tag  : Creates a HTML <select> element, associated with a bean property specified by our attributes. 

Note:

  1. This tag is only valid when nested inside a form tag body.
  2. This tag operates in two modes, depending upon the state of the multiple attribute, which affects the data type 
    of the associated property  you should use:
    * multiple="true" IS NOT selected - The corresponding property should be a scalar value of any supported 
       data type.
    * multiple="true" IS selected - The corresponding property should be an array of any supported data type.
  3. The ActionForm bean associated with this form must include a statement resetting the scalar property to a 
    default value (if multiple is not set), or the array property to zero length (if multiple is set) in the reset() method.
     Which facilitate to recognize cases where no selection .
Name Description
multiple If set to any arbitrary value, the rendered select element will support multiple selections.
name This attribute specifies the name of the bean whose properties are consulted to determine which option should be pre-selected when rendering this input field. If not specified, the bean associated with the enclosing <html:form> tag is utilized.
property The "property" attribute specifies the Name of the request parameter that will be included with this submission, set to the specified value.
size The number of available options displayed at one time.
value The value to compare with for marking an option selected.

 

Example Illustrating the use of the Select<html:select> & <html:option> tag.
Here you will learn to use the Struts Html <html:select> tag. 
We will cover an example that will show a working of<html:select>tag.


Example code
Creating an FormBean Class :
Develop a simple Form Bean class SelectTagActionForm.java.

package ActionForm;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
public class SelectTagActionForm extends org.apache.struts.action.ActionForm{   
  private String singleSelect;  
  public String getSingleSelect() {
  return singleSelect;
  
  public void setSingleSelect(String string) {
  singleSelect = string;
  }  
  public SelectTagActionForm() {
  super();  
  }
}

Develop a simple  action  class SelectTagAction.java :

package action;
import ActionForm.SelectTagActionForm;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
public class SelectTagAction extends Action { 
  private final static String SUCCESS = "success";   
  public ActionForward execute(ActionMapping mapping, ActionForm  form,
 HttpServletRequest request, HttpServletResponse response)
 throws Exception {
 if(form!=null){
 SelectTagActionForm selectTagActionForm=(SelectTagActionForm)form;
 selectTagActionForm.getSingleSelect();
  }
  return mapping.findForward(SUCCESS);  
  }
}

Defining form Bean in struts-config.xml file :
Add the following entry in the struts-config.xml file for Form Bean.
Defining the form bean :

<form-bean name="SelectTagActionForm" type="ActionForm.SelectTagActionForm"/>

Developing the Action Mapping in the struts-config.xml :
Here, Action mapping helps to select the  From Bean And the Action class etc, for specific requests.

<action input="/" name="SelectTagActionForm" path="/SelectTagAction" 
   scope=
"session" type="action.SelectTagAction" validate="false">

<forward name=
"success" path="/HtmlSelectTagOutPut.jsp"/>

</action>

Developing the HtmlSelectTag.jsp page :

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>
<%taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<%taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic"%>
<!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=UTF-8">
  <title>JSP Page</title>
  </head>
  <body bgcolor="#999933">
  
  <h3><font color="#FFFF33">HTML SELECT TAG DEMO.......</font></h3>
  <th align="right"><font color="#FFFF33"><b>Single Select Allowed:</b>
  </font>
</th>
  
 <html:form action="SelectTagAction" method="POST">
 <table border="2">
 <tr><td>
  <html:select name="SelectTagActionForm" property="singleSelect" size="5">
  
  <html:option value="0">select 0</html:option>
  <html:option value="1">select 1</html:option>
  <html:option value="2">select 2</html:option>
  <html:option value="3">select 3</html:option>
  <html:option value="4">select 4</html:option>
  <html:option value="5">select 5</html:option>
  <html:option value="6">select 6</html:option>
  <html:option value="7">select 7</html:option>
  <html:option value="8">select 8</html:option>
  <html:option value="9">select 9</html:option>
  
  </html:select><br/><br/>
  </td></tr> 
  <tr><td>
  <html:submit/> 
  </td></tr>
  </table>
  </html:form>  
  </body>
</html>

Developing the HtmlSelectTagOutPut.jsp page :


<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>
<%taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<%taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
  <a href="HtmlSelectTag.jsp">Go Back......</a><br/>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title><font color="#FFFF33">OUT PUT</font></title>
  </head>
  <body bgcolor="#999933"
  <h3><font color="#FFFF33">OUT PUT</font></h3> 
  <h3><font color=""><font color="#FFFF33">Selected Value is.......
</font>
</h3>

  <bean:write name="SelectTagActionForm" property="singleSelect"/>
  </body>
</html>

Add the following line in the index.jsp to call the form.

<a href="HtmlSelectTag.jsp">HtmlSelectTagDemo</a><br/>

Building and Testing the Example :

Build, deploy and Test the application .
Open the browser and navigate to the HtmlSelectTag.jsp page.
Your browser displays the following page.

Don't select the option on the HtmlSelectTag.jsp page, and see the output.

Output without selecting option...

Now select any option to the HtmlSelectTagOutPut.jsp .

Output when selecting a option...


Above actions displays the working of <html:select> with <html:option>tag.

     
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Posted on: January 10, 2008

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