Extends mousetrap.js to provide a special bind which overrides any further events, including browser behaviour

override.js

/**
 * Adds a bindOverride and possibly bindOverrideGlobal [if bind global is installed]
 *  These methods override default broser behaviour before calling the callback
 *
 * usage:
 * Mousetrap.bindGlobal('ctrl+s', _saveChanges);
 */
Mousetrap = (function(Mousetrap) {
    Mousetrap.bindOverride = function(keys, callback, action) {
        var override_callback = function(e) {
            if (e.preventDefault) {
                e.preventDefault();
            } else {
                // internet explorer
                e.returnValue = false;
            }
            _saveDraft();
            callback(e);
        };
        Mousetrap.bind(keys, override_callback, action);
    };

    if (typeof Mousetrap.bindGlobal === 'function') {
        Mousetrap.bindOverrideGlobal = function(keys, callback, action) {
            var override_callback = function(e) {
                if (e.preventDefault) {
                    e.preventDefault();
                } else {
                    // internet explorer
                    e.returnValue = false;
                }
                _saveDraft();
                callback(e);
            };
            Mousetrap.bind(keys, callback, action);
        };
    }
 
    return Mousetrap;
}) (Mousetrap);