How to disable backspace if anything other than input field is focused on using jquery

Question

How do I disable backspace keystroke if anything other than 2 specific input fields are focused on using jquery?

here is my current code (NOW INCLUDING 2 TEXTBOXES):

Answer 1

I think a slight modification is needed to handle textareas:

var elid = $(document.activeElement).is("input:focus, textarea:focus");