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

Demonstrated below to allow only letters [a-z] using Jquery:

  $(function() {
    $('#txtFirstName').keydown(function(e) {
      if (e.shiftKey || 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();
        }
      }
    });
  });