Checkboxes are used when more than one option is required to be selected.
Following is an 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 above code will generate the following result −
Following is main.jsp JSP program to handle the input given by the web browser for the checkbox button.
<html>
<head>
<title>Reading Checkbox Data</title>
</head>
<body>
<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>The above program will generate the following result −
Reading Checkbox Data
Maths Flag :: on
Physics Flag:: null
Chemistry Flag:: on