Pro JavaScript Techniques by John Resig Russ Ferguson & John Paxton

Author:John Resig, Russ Ferguson & John Paxton
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

With the ability to stop the event bubbling, you now have complete control over which elements can see and handle an event. This is a fundamental tool necessary for exploring the development of dynamic web applications. The final aspect is to cancel the default action of the browser, allowing you to completely override what the browser does and implement new functionality instead.

Overriding the Browser’s Default Action

For most events that take place, the browser has some default action that will always occur. For example, clicking an <a> element will take you to its associated web page; this is a default action in the browser. This action will always occur after both the capturing and the bubbling event phases, as shown in Figure 6-3, which illustrates the results of a user clicking an <a> element in a web page. The event begins by traveling through the DOM in both a capturing and bubbling phase (as discussed previously). However, once the event has finished traversing, the browser attempts to execute the default action for that event and element. In this case, it’s visiting the / web page.

Figure 6-3.The full life cycle of an event

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