Events

The following tables describe the event handlers available in client-side JavaScript. Note that the elements supporting these event handlers differ considerably in Netscape Navigator and Internet Explorer.

To handle an event, the event handler and the function to handle it must be specified in the HTML element for which the event applies.

Mouse Events

Event	Introduced	Description
onclick	JavaScript 1.0	Raised when the user clicks on an HTML control.
ondblclick	JavaScript 1.2	Raised when the user double-clicks on an HTML control.
onmousedown	JavaScript 1.2	Raised when the user presses a mouse button.
onmousemove	JavaScript 1.2	Raised when the user moves the mouse pointer.
onmouseout	JavaScript 1.1	Raised when the user moves the mouse pointer out from within an HTML control.
onmouseover	JavaScript 1.0	Raised when the user moves the mouse pointer over an HTML control.
onmouseup	JavaScript 1.2	Raised when the user releases the mouse button.

Keyboard Events

Event	Introduced	Description
onkeydown	JavaScript 1.2	Raised when the user presses a key on the keyboard.
onkeypress	JavaScript 1.2	Raised when the user presses a key on the keyboard. This event will be raised continually until the user releases the key.
onkeyup	JavaScript 1.2	Raised when the user releases a key that had been pressed.

HTML Control Events

Event	Introduced	Description
onblur	JavaScript 1.0	Raised when an HTML control loses focus.
onchange	JavaScript 1.0	Raised when an HTML control loses focus and its value has changed.
onfocus	JavaScript 1.0	Raised when focus is set to the HTML control.
onreset	JavaScript 1.1	Raised when the user resets a form.
onselect	JavaScript 1.0	Raised when the user selects text in an HTML control.
onsubmit	JavaScript 1.0	Raised when the user submits a form.

Window Events

Event	Introduced	Description
onload	JavaScript 1.0	Raised when the window has completed loading.
onresize	JavaScript 1.2	Raised when the user resizes the window.
onunload	JavaScript 1.0	Executes JavaScript code when the user exits a document.

Other Events

Event	Introduced	Description
onabort	JavaScript 1.1	Raised when the user aborts loading an image.
onerror	JavaScript 1.1	Raised when an error occurs loading the page.