XHTML Events

When you visit a website, you do things like click on text, images and hyperlinks, hover-over things, etc. These are examples of what JavaScript calls events.

We can write our event handlers in JavaScript or VBScript and can specify these event handlers as a value of event tag attribute. The XHTML 1.0 has a similar set of events which is available in HTML 4.01 specification.

The <body> and <frameset> Level Events

There are only two attributes which are used to trigger any JavaScript or VBScript code, when any event occurs at document level.

Attribute	Value	Description
onload	Script	Script runs when a XHTML document loads.
onunload	Script	Script runs when a XHTML document unloads.

The <form> Level Events

There are six attributes which are triggered when any event occurs at form level.

Attribute	Value	Description
onchange	Script	It is executed when the element changes.
onsubmit	Script	It is executed when the form is submitted.
onreset	Script	It is executed when the form is reset.
onselect	Script	It is executed when the element is selected.
onblur	Script	It is executed when the element loses focus.
onfocus	Script	It is executed when the element gets focus.

Keyboard Events

There are three events which are generated by keyboard. The keyboard events are not valid in base, bdo, br, frame, frameset, head, html, iframe, meta, param, script, style, and title elements.

Attribute	Value	Description
onkeydown	Script	This is executed when the user press the keyboard button.
onkeypress	Script	This is executed when the user press and release the keyboard button.
onkeyup	Script	This is executed when the user release the keyboard button.

Mouse Events

There are some mouse generated events which executes when it comes in contact with any HTML tag. These events are not valid in base, bdo, br, frame, frameset, head, html, iframe, meta, param, script, style, and title elements.

Attribute	Value	Description
onclick	Script	It is executed on a mouse click.
ondblclick	Script	It is executed on a mouse double-click.
onmousedown	Script	It is executed when mouse button is pressed.
onmousemove	Script	It is executed when mouse pointer moves.
onmouseout	Script	It is executed when mouse pointer moves out of an element.
onmouseover	Script	It is executed when mouse pointer moves over an element.
onmouseup	Script	It is executed when mouse button is released.