How to Get a Selected Radio Button in a Servlet From JSP

Radio buttons allow programmers to control the amount of selections a user can choose on a JSP form. Use the "request.getParameter()" function in a JSP applet to retrieve the selected value from a radio button. When the user chooses another radio button value, the previously selected value is deactivated. Retrieve the radio button value and assign it to a string, so you can use the value later in your form processing.

Instructions

1. Open your preferred JSP editor and open the project for your Web application to load all of the source files in the editor.

2. Open the JSP file that contains your group of radio buttons. You need the "ID" of the radio button for the processing page to retrieve the value. The "ID" property is located in the tag definition of the radio button.

3. Open the source code file you want to use to retrieve the radio button. Add the following code to retrieve the radio button's value:

   string radiovalue = request.getParameter("id");

   Replace "ID" with the ID of your radio button group.

References

• Johns Hopkins University: Handling Form Data