Event Capturing and Event Bubbling in jQuery


Introduction

Before diving to define both terms, let's look at the image given below.


In above image, there is a <div> that has <span> and <p>. For any event, there are multiple elements that could logically be responsible for reacting. When the link on this page is clicked, <div>, <span> and <a> all should get the opportunity to respond. On the other hand <p> element is not part of this interaction at all.

Event Capturing

It is a strategy that allow multiple elements to respond to the user interaction (like click, mouse move etc). In Event Capturing, even is first given to the most all-encompassing element and then to successively more specific ones. In the above example, first the <div> gets passed the event, then the <span> and at the end <a>.

Event Bubbling

It is just opposite strategy where the event gets sent to the most specific element and after this element has an opportunity to react, the event bubbles up to more general elements. In the above example, <a> would be handled the event first and then <span> and <div>.
Find a nice example of Event Bubbling here

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