How to get checkbox value in form submission
Suppose you have a checkbox in your HTML form like this: <form> Email Address: <input type="email" name="email"> <input type="checkbox" name="opt_in_newsletter" > Subscribe to the newsletter </input> If the user checks the option, you will get the following form data email=name@domain.com opt_in_newsletter=on However, if the user does not check the option, then the opt_in_newsletter field itself will not be present in the form data that you receive on the server-side. email=name@domain.com You might have expected opt_in_newsletter=off But in reality, the behavior is different the W3c recommendation supports this behavior by the way.