8. Handling Events

In This Chapter

Handling Window Events 196 Mouse Event Handling 204 Form Event Handling 212 Key Event Handling 216

Events are actions that the user performs while visiting your page. When the browser detects an event, such as a mouse click or a key press, it can trigger JavaScript objects associated with that event, called event handlers. In most of the previous chapters in this book, you’ve seen examples of how event handlers are used. But event handling is such an important technique to understand—and it encompasses virtually all of your pages’ interaction with the user—that it deserves its own chapter.