HTML and CSS Reference
In-Depth Information
EXPLANATION
1
This function will be called when a series of events are fired.
2
The
attachEvent()
method (IE) causes the onload event to fire when the page has
loaded. The
onload
event is a window event, and the function defined on line 1,
called
greetings()
will be called when that event is fired. This method requires that
you use the
on
prefix with the event handler (see Figure 15.45).
3
The
attachEvent()
method (IE) causes the
click
event to fire when the user clicks
anywhere on the document (i.e., Web page). When that happens the
greetings()
function will be called.
4
The
attachEvent()
method (IE) causes a
mouseover
event to fire when the user
moves the mouse in the document. Two different events are tied to the document.
5
The
detachEvent()
method (IE) causes the mouse event created on line 4 to be re-
moved.
Figure 15.45
When the page loads an event is fired and when the user clicks
anywhere on the document another event is fired.
In Chapter 13 we discussed the event object. There are a number of event types defined
by the DOM HTML Events module, as shown in Table 15.8.
In Example 15.24, event listeners for both the DOM and Internet Explorer model are
listening for
mouseOver
and
mouseOut
events. The function parameter of the event lis-
teners change the style of a block of text to give it emphasis. When the mouse rolls over
a specific block of text, the event handler invokes a function that can check to see what
block of text the mouse is on and detect when it leaves the box. The node where the
