Event Triggers


The names of some event handlers clearly describe what actions trigger the event. (It doesn’t take rocket science to figure that an onClick event is fired when something is clicked.) Other events are a little less intuitive.

Remember, also, that event names change in different environments. For example, the JavaScript onBlur event is called the LostFocus event in most Windows programming environments.

Table 8-2 shows JavaScript event handlers and the actions that fire them.

Table 8-2: Events and Their Triggers

Event

Action That Fires the Event

onAbort

The loading of an image is interrupted.

onBlur

The object loses input focus—typically because the user moves to another screen element using the mouse or keyboard.

onChange

In a select list, the user selects or deselects an element. In a text box, the user enters or changes text and causes focus to move to another object.

onClick

The user clicks once. You can return false in code to cancel a default action.

onDblClick

The user clicks twice.

onError

An error occurs while loading an image.

onFocus

The object gains input focus—usually because the user has moved to the object using the mouse or keyboard.

onKeyDown

The user presses a key. You can return false in code to cancel.

onKeyPress

The user presses or releases a key. (onKeyPress is the same as onKeyDown or onKeyUp.)

onKeyUp

The user releases a key.

onLoad

A document or image finishes loading.

onMouseDown

The user presses a mouse button.

onMouseOut

The mouse is moved off an element.

onMouseOver

The mouse is moved over an element. (For links, to prevent the URL from appearing in the status bar, return true.)

onMouseUp

The user releases a mouse button.

onReset

A form reset is requested.

onResize

A window is resized.

onSubmit

A form submission is requested.

onUnload

A document is unloaded.




Learn How to Program Using Any Web Browser
Learn How to Program Using Any Web Browser
ISBN: 1590591135
EAN: 2147483647
Year: 2006
Pages: 115
Authors: Harold Davis

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