Want html form submit to do nothing

Question

I want an html form to do nothing after it has been submitted.

action="" 

is no good because it causes the page to reload.

Basically i want an ajax function to be called whenever a button is pressed or someone hits "enter" after typing it data. Yes i could drop the form tag and add just call the function from the button's onclick event, but i also want the "hitting enter" functionality without getting all hackish.

Answer 1

It also works:

<form id='my_form' action="javascript:myFunction(); return false;">

Answer 2

<form onsubmit="return false;">

Answer 3

<form id="my_form" onsubmit="return false;">

is enough ...