Check if form has elements or is empty?

Check if form has elements or is empty?

Hi,

I was wondering if I can get some help.  I have a form that is a regular form but in some cases it might be empty.

<form id="myform"></form> 

or it might have some elements

<form id="myform"><input name="X" value="X" /><input name="Y" value="Y" /></form>

What is the proper way to count or check if the form has say inputs, select, textarea, etc..., or check if it's empty?