| Popeye() And Olive() |
An event may be defined, very simply, as an action performed on a Web page - for example, clicking a button, moving the mouse pointer over a hyperlink and so on. Events are not necessarily generated by the user; they may be generated automatically by a piece of code as well.
An event handler, as the name suggests, handles an event - it defines the action to be taken by a script when a particular event (or type of event) occurs. Event handlers exist for most of the common events that are generated on a Web page, including mouse movement, mouse clicks, keyboard activity and page loads.
Here's a quick example that might make this theory a little clearer:
Another example, and one you've probably seen before, is
<a href="http://somewhere" onMouseOver="popeye()" onMouseOut="olive()"><img name="myimage" src="normal.jpg"></a>
How to do Everything with PHP & MySQL
How to do Everything with PHP & MySQL, the best-selling book by Melonfire, explains how to take full advantage of PHP's built-in support for MySQL and link the results of database queries to Web pages. You'll get full details on PHP programming and MySQL database development, and then you'll learn to use these two cutting-edge technologies together. Easy-to-follow sample applications include a PHP online shopping cart, a MySQL order tracking system, and a PHP/MySQL news publishing system.
Read more, or grab your copy now!