Visual Event - useful bookmarklet for web developers -

Introduction

Visual Event is an Open Source JavaScript bookmarklet which provides debugging information about events that have been attached to DOM elements. Visual Event shows:

Which elements have events attached to them

The type of events attached to an element

The code that will be run with the event is triggered

The source file and line number for where the attached function was defined (Webkit browsers and Opera only)

How to use 

Navigate to author's page, locate the bookmarklet, and drag to favorites bar. 

How it works? 

Bookmarklet supports number of widely used JavaScript libraries, like  jQuery 1.2+, YUI 2,MooTools 1.2+, Prototype 1.6+,Glow as well as Dom 0 events, i.e. 'onclick'. etc. 

Example of use:  you navigate to site that is built using one of specified above libraries, and bookmarklet visually highlights element with attached events,  as well as shows  source of the event subscriber function. 

 Let's demonstrate on example of the CodeProject website:

This is how menu organized:

This is how submit a tip logic organized:

Points of Interest

This is easy to use tool that can be used by developer - to evaluate website logic, someone else page coding approach, etc I believe this is must have bookmarklet for every web developer.

Links 

Author's page for the bookmarklet: http://www.sprymedia.co.uk/article/Visual+Event+2 

Source on Github  https://github.com/DataTables/VisualEvent