JavaScript keypress / keycode

keycode.js

$(document).on('keypress', function(e)
{
    // Evaluate keycode into a lowercase human-readable letter
    var key = String.fromCharCode(e.charCode).toLowerCase();
    
    // Figure what to do with each key
    switch(key)
    {
        case 'a':
            console.log('a pressed');
            break;
            
        default:
            break;
    }
});