Keep tabbing within modal pane only

This is just expanding on Christian answer, by adding the additional input types and also taking into consideration the shift+tab.

var inputs = $element.find('select, input, textarea, button, a').filter(':visible');
var firstInput = inputs.first();
var lastInput = inputs.last();

/*set focus on first input*/
firstInput.focus();

/*redirect last tab to first input*/
lastInput.on('keydown', function (e) {
   if ((e.which === 9 && !e.shiftKey)) {
       e.preventDefault();
       firstInput.focus();
   }
});

/*redirect first shift+tab to last input*/
firstInput.on('keydown', function (e) {
    if ((e.which === 9 && e.shiftKey)) {
        e.preventDefault();
        lastInput.focus();
    }
});