Submit form when radio button is checked

Update: I meant radio buttons, not checkboxes.

I'm building a form for a survey, using radio buttons and would like to know if it's possible to set it up so that the form is submitted right away, when a radio button is checked?

I.e. no submit button, but submitting being triggered by checking a radio button.

Adding some javascript?

Could I use the gform_field_choices filter to insert an onclick event on the radio buttons?

http://www.gravityhelp.com/documentation/page/Gform_field_choices

Ideally on specific radio buttons, because I have conditional logic on an "Other" choice, so that users can enter an answer in a textfield before submitting.