jQuery e.which in switch statement

Question

In the below switch statement when left key is pressed, it alerts left and when top key is pressed it alerts top. How can i make a case for combination of both shift and left key.

$(document).keydown(function(e) {
    switch (e.which) {
        case 37: alert('left'); //left arrow key
            break;
        case 38: alert('top');; //up arrow key
            break;
        case ??: alert('shift + left'); //How can i make this repond to the combination of shift + left arrow keys.
            break;
    }
});

Answer 1

The shift key is a modifier, and can be checked in the case statement for the left key.

$(document).keydown(function(e) {
    switch (e.which) {
     case 37:
        if (e.shiftKey) {
            alert('shift+left'); // shift and left arrow key
        }
        else {
            alert('left'); //left arrow key
        }
        break;
     case 38:
        alert('top'); //up arrow key
        break;
    }
});

Demo: http://jsfiddle.net/ZL9Fx/1/