Select Tag<html:select>:
html:select Tag : Creates a HTML <select> element, associated
with a bean property specified by our attributes.
Note:
- This tag is only valid when nested inside a form tag body.
- 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. - 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.