Disable keyboard in some fields

Question

I need to make the letter f only work in text fields, in other places it does not work, example:

$(document).keyup(function(e) {
    if (e.keyCode == 37) { 
               return false;
     }
});

Answer 1

For this it is enough that, in the text fields, you prevent the propagation event - so that the generic code does not act on it. Also, it is better to deal with the keydown instead of the keyup because - the moment the keyup is activated - the effect of pressing the button has already happened.

$(document).keydown(function(e) {
    if (e.keyCode == 70) { 
        return false; // Equivalente a: e.stopPropagation(); e.preventDefault();
    }
});

$('input[type="text"]').keydown(function(e) {
    e.stopPropagation();
});

Example in jsFiddle. In the textarea key F will have no effect (as it is being treated by Handler global), but in the text box it works normally.