event key code for ampersand?

Answer 1

ok got it! it is 38! sorry for putting up this question!

Answer 2

Check if the shift key is down:

//e = Event
(e.shiftKey && e.keyCode === 55) //returns true if Shift-7 is pressed

Answer 3

Use the keypress event and test directly for the character as follows. Don't mess with key codes: they will vary between different keyboard types and cultures. Character codes won't.

var el = document.getElementById("your_input");

el.onkeypress = function(evt) {
    evt = evt || window.event;
    var charCode = evt.which || evt.keyCode;
    var charStr = String.fromCharCode(charCode);
    if (charStr == "&" || charStr == "_") {
        alert(charStr);
        return false;
    }
};