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Detecting Shift, Alt, Ctrl

To detect if the Shift, Alt, or Ctrl keys are pressed, both IE and the DOM can do the following:

var bShift = oEvent.shiftKey;

var bAlt = oEvent.altKey;

var bCtrl = oEvent.ctrlKey;

Each of these properties contains a Boolean value indicating whether the key is being pressed (each of

these keys also fires a

keydown

event enabling you to retrieve its

keyCode

Getting the client coordinates

During mouse events, you can retrieve the location of the mouse cursor in relation to the client area by

using the

clientX

and

clientY

properties:

var iClientX = oEvent.clientX;

var iClientY = oEvent.clientY;

The client area is the part of the window that displays the Web page (see Figure 9-7). These properties

tell you how far from the edge (in pixels) of that area the mouse is located.

Figure 9-7

Client Area

(clientX,clientY)

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All about Events

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