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

This will disable backspace on your site without having to add specific classes to input boxes. To disable backspace except when using input boxes use .is("input:focus") if you want to disable backspace except when using textarea boxes use .is("input:focus, textarea:focus")

$(document).keypress(function(e){ 
    var elid = $(document.activeElement).is("input:focus"); 
    if(e.keyCode === 8 && !elid){ 
       return false; 
    }; 
});