How to detect keyboard modifier (Ctrl or Shift) through JavaScript

Check event.ctrlKey:

function keyHandler(event) {
    event = event || window.event;
    if(event.keyCode==65 && event.ctrlKey) {
        // ctrl+a was typed.
    }
}

key codes:

shift   16
ctrl    17
alt     18

your jQuery:

$(document).keydown(function (e) {
    if (e.keyCode == 18) {
        alert("ALT was pressed");
    }
});

JavaScript Madness: Keyboard Events

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