Allow text box only for letters using jQuery?

Question

I want to make a text box allow only letters (a-z) using jQuery. Any examples?

Answer 1

JQuery function to allow only small and Capital Letters:

Text Field:

JQuery Function:

$('#a').keydown(function (e) {
    if (e.ctrlKey || e.altKey) {
           e.preventDefault();
    } else {
           var key = e.keyCode;
           if (!((key == 8) || (key == 32) || (key == 46) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) {
                e.preventDefault();
           }
    }
});