JavaScript and Ajax for the Web: Visual QuickStart Guide, Seventh Edition

Handling Events

Events are actions that the user performs while visiting your page. Submitting a form and moving a mouse over an image are two examples of events.

JavaScript deals with events using commands called event handlers. An action by the user on the page triggers an event handler in your script. The 12 most common JavaScript event handlers are listed in Table 1.1. We deal with other, more advanced event handlers in Chapter 9.

Table 1.1. Event Handlers

Event	What it handles
onabort	The user aborted loading the page
onblur	The user left the object
onchange	The user changed the object
onclick	The user clicked an object
onerror	The script encountered an error
onfocus	The user made an object active
onload	The object finished loading
onmouseover	The cursor ...