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720 Part III . Document Objects Reference Listing 29-3 (continued)

 layer1

In some cases, your scripts need to know if an event that is passed onward by routeEvent() method activated a function that returns a value. This knowledge is especially valuable if your event must return a trueor falsevalue to let an object know if it should proceed with its default behavior (for example, whether a link should activate its HREF attribute URL or cancel after the event handler evaluates to return true or return false). When a function is invoked by the action of a routeEvent() method, the return value of the destination function is passed back to the routeEvent()method. That value, in turn, can be returned to the object that originally captured the event. Event traffic cop The last scenario is one in which a higher-level object captures an event and directs the event to a particular object elsewhere in the hierarchy. For example, you could have a document-level event handler function direct every click event whose modifiers property indicates that the Alt key was pressed to a Help button object whose own onClick event handler displays a help panel (perhaps shows an otherwise hidden layer). You can redirect an event to any object via the handleEvent() method. This method works differently from the others described in this chapter, because the object reference of this method is the reference of the object to handle the event
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