768 Part III . Document Objects Reference each (Web server hosting)
Friday, December 21st, 2007768 Part III . Document Objects Reference each of the keyboard (regardless of its character). To inspect the character of a key, use the onKeyPress event to create the eventobject, and then look at the event object s charCodeproperty. This is the property that returns 97 for a and 65 for A because it s concerned with the character associated with the key action. This property s value is zero for onKeyDown and onKeyUpevents. In contrast, the keyCode property is filled with a non-zero value only from onKeyDown and onKeyUpevents (onKeyPresssets the property to zero) when alphanumeric keys are pressed; for most other non-character keys, all three events fill the keyCodeproperty. Through this property you can look for non-character keys, such as arrows, page navigation, and function keys. For the character keys, there is no distinction between uppercase or lowercase: The A key on the Latin keyboard returns a value of 65, regardless of the state of the Shift key. At the same time, however, the press of the Shift key fires its own onKeyDownand onKeyUp events, setting the keyCode value to 16. Other non-character keys arrows, page navigation, function, and similar have their own codes as well. This gets very detailed, including special key codes for the numeric keyboard keys that are differ ent from their corresponding numbers along the top row of the alphanumeric keyboard. Be sure to see the extensive section on keyboard events in Chapter 15 for examples of how to apply the keyCode property in applications. On the CD-ROM Example (with Listing 29-18) on the CD-ROM Related Items: onKeyDown, onKeyPress, onKeyUp event handlers. clientX clientY layerX layerY pageX pageY screenX screenY Value: Integer Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . The NN6 event object borrows mouse coordinate properties from both the NN4 and IE4+ event models. If you have worked with event coordinates in these other browsers, then you have nothing new to learn for NN6. (NN6) eventObject.clientX
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