update_post_meta using Jeditable

I’m trying to allow users to edit a <div> using Jeditable.

I have the editable <div> working fine, and all my Javascript options are set.

I’m simply running into trouble with my save script. I would like to simply update a custom field (the only element in the editable div).

In my save script, I know I should be using update_post_meta but I’m having some issues getting it to work. Are there other variables I need to set up before calling update_post_meta?

Save script is currently a simple:

$text = $_POST['editext'];
	global $post;
	$text = update_post_meta( $post->ID, '_cmb_editext_textarea' );
	echo $text;