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Passing Checkbox Data to JSP Program example program

Passing Checkbox Data to JSP Program

Checkboxes are used when more than one option is required to be selected.
Here is example HTML code, CheckBox.htm, for a form with two checkboxes


<html>
<body>
<form action="main.jsp" method="POST" target="_blank">
<input type="checkbox" name="maths" checked="checked" /> Maths
<input type="checkbox" name="physics"  /> Physics
<input type="checkbox" name="chemistry" checked="checked" />
                                                Chemistry
<input type="submit" value="Select Subject" />
</form>
</body>
</html>

The result of this code is the following form

Top of Form
Maths Physics Chemistry
Bottom of Form
Top of Form
Bottom of Form


Below is main.jsp JSP program to handle input given by web browser for checkbox button.
<html>
<head>
<title>Reading Checkbox Data</title>
</head>
<body>
<center>
<h1>Reading Checkbox Data</h1>
<ul>
<li><p><b>Maths Flag:</b>
   <%= request.getParameter("maths")%>
</p></li>
<li><p><b>Physics Flag:</b>
   <%= request.getParameter("physics")%>
</p></li>
<li><p><b>Chemistry Flag:</b>
   <%= request.getParameter("chemistry")%>
</p></li>
</ul>
</body>
</html>
For the above example, it would display following result:
Reading Checkbox Data
  • Maths Flag : : on
  • Physics Flag: : null
  • Chemistry Flag: : on


Reading All Form Parameters:
Following is the generic example which uses getParameterNames() method of HttpServletRequest to read all the available form parameters. This method returns an Enumeration that contains the parameter names in an unspecified order.
Once we have an Enumeration, we can loop down the Enumeration in the standard manner, using hasMoreElements() method to determine when to stop and using nextElement() method to get each parameter name.
<%@ page import="java.io.*,java.util.*" %>
<html>
<head>
<title>HTTP Header Request Example</title>
</head>
<body>
<center>
<h2>HTTP Header Request Example</h2>
<table width="100%" border="1" align="center">
<tr bgcolor="#949494">
<th>Param Name</th><th>Param Value(s)</th>
</tr>
<%
   Enumeration paramNames = request.getParameterNames();
 
   while(paramNames.hasMoreElements()) {
      String paramName = (String)paramNames.nextElement();
      out.print("<tr><td>" + paramName + "</td>\n");
      String paramValue = request.getHeader(paramName);
      out.println("<td> " + paramValue + "</td></tr>\n");
   }
%>
</table>
</center>
</body>
</html>
Following is the content of Hello.htm:
<html>
<body>
<form action="main.jsp" method="POST" target="_blank">
<input type="checkbox" name="maths" checked="checked" /> Maths
<input type="checkbox" name="physics"  /> Physics
<input type="checkbox" name="chemistry" checked="checked" /> Chem
<input type="submit" value="Select Subject" />
</form>
</body>
</html>
Now try calling JSP using above Hello.htm, this would generate a result something like as below based on the provided input:

Reading All Form Parameters

Param Name
Param Value(s)
maths
on
chemistry
on

You can try above JSP to read any other form's data which is having other objects like text box, radio button or drop down box etc.

If you have any problem to this program , so plz send your feedback ! we'll reply you soon.

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