212 Part III .Document Objects Reference Example on (Hosting web)
212 Part III .Document Objects Reference Example on the CD-ROM Related Items: onMouseOver, onMouseOut event handlers. onMouseMove NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility ( ) The onMouseMove event handler fires whenever the cursor is atop the current object and the mouse is moved, even by a single pixel. You do not have to press the mouse button for the event to fire, although the event is most commonly used in element dragging especially in NN, where no onDrag event handler is available. Even though the granularity of this event can be at the pixel level, you should not use the number of event firings as a measurement device. Depending on the speed of cursor motion and the performance of the client computer, the event may not fire at every pixel location. In NN4, you cannot assign the onMouseMoveevent handler to any object by way of tag attributes. But you can use the NN4 event capturing mechanism to instruct (via scripting) a window, document, or layer object to capture mouseMoveevents. This allows for NN4 scripts to produce positioned element (layer) dragging. In IE4+ and NN6+, however, you can assign the onMouseMoveevent handler to any element (although you can drag only with positioned elements). When designing a page that encourages users to drag multiple items on a page, it is most common to assign the onMouseMove event handler to the document object and let all such events bubble up to the document for processing. Example (with Listing 15-43) on the CD-ROM Related Items: onDrag, onMouseDown, onMouseUp event handlers. onMouseOut onMouseOver NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility The onMouseOver event fires for an object whenever the cursor rolls into the rectangular space of the object on the screen (one event per entry into the object except for a bug in NN4/Windows, which causes the onMouseOverevent On the CD-ROM On the CD-ROM elementObject.onMouseOut
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