ctrl+s instead of submit

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$(window).keydown(function(event) {
    if (!(event.which == 83 && event.ctrlKey) && !(event.which == 19)) return true;
    alert("Ctrl-S pressed");
    event.preventDefault();
    return false;
});
</script>


or other example for mac also including IE, FIrefox and Chrome is

// simply disables save event for chrome
$(window).keypress(function (event) {
    if (!(event.which == 115 && (navigator.platform.match("Mac") ? event.metaKey : event.ctrlKey)) && !(event.which == 19)) return true;
    event.preventDefault();
    return false;
});

// used to process the cmd+s and ctrl+s events
$(document).keydown(function (event) {
     if (event.which == 83 && (navigator.platform.match("Mac") ? event.metaKey : event.ctrlKey)) {
        event.preventDefault();
        save(event);
        return false;
     }
});