detect-shortcut.js

var doAction = function() {
  // do something when ctrl-enter is pressed 
}

$(document).ready(function() {
    var ctrlDown = false,
        ctrlKey = 17,
        cmdKey = 91,
        enterKey = 13;

    $(document).keydown(function(e) {
        if (e.keyCode == ctrlKey || e.keyCode == cmdKey) ctrlDown = true;
    }).keyup(function(e) {
        if (e.keyCode == ctrlKey || e.keyCode == cmdKey) ctrlDown = false;
    });

    $(document).keydown(function(e) {
        if (ctrlDown && e.keyCode == enterKey) doAction();
    });
});