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.
|
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Current Comments
1 comments so far (post your own) View All Comments Latest 10 Comments:This has very nice and detailed explanation of working with html:select tag.
Thank you.
Posted by Sanjeev Goyal on Tuesday, 01.29.08 @ 21:21pm | #46513