DevGuru JavaScript OBJECT: Event



			OBJECT: Event An Event object is created automatically by JavaScript on the occurance of an event. It has various properties that provide information about the event such as event type, the position of the cursor at the time the event occured, etc. Not all of the properties relate to every type of event; the one's that do are documented in the individual event handler pages. The following example creates a button that, when clicked, displays an alert box showing the event type (in this case a 'click' event). Code: <input type="button" value="Event type" onClick='alert("The event type is " + event.type)'> PROPERTIES data Property This property relates to the DragDrop event and its use returns an array that contains the URLs of any dropped objects, as strings. Syntax: event.data height Property This property relates to the height of the window or frame that contains the object that initiated the event. Syntax: event.height layerX / layerY Property These properties returns a number that represents the horizontal/vertical position, in pixels, of the cursor relative to the layer that initiated the event, or, when passed with a resize event, it represents the object width/height. These properties are synonyms for, and interchangable with, the x and y event object properties. Syntax: event.layerX Syntax: event.layerY modifiers Property This property returns a string containing details of any modifier keys that were held down during a key or mouse event. The values of the modifier keys are as follows: ALT_MASK, CONTROL_MASK, SHIFT_MASK and META_MASK. Syntax: event.modifiers pageX / pageY Property These properties return the horizontal/vertical position of the cursor relative to the page, in pixels, at the time the event occured. Syntax: event.pageX Syntax: event.pageY screenX / screenY Property These properties return the horizontal/vertical position of the cursor relative to the screen, in pixels, at the time the event occured. Syntax: event.screenX Syntax: event.screenY target Property This property returns a reference to the object that the event was originally sent to. Syntax: event.target type Property This property returns a string that represents the type of the event (click, key down, etc.). Syntax: event.type which Property This property returns a number that represents either which mouse button (1 being the left button, 2 the middle and 3 the right) was pressed or which key was pressed (its ASCII value) at the time the event occuered. Syntax: event.which width Property This property relates to the height of the window or frame that contains the object that initiated the event. Syntax: event.width x / y Property These properties returns a number that represents the horizontal/vertical position, in pixels, of the cursor relative to the layer that initiated the event, or, when passed with a resize event, it represents the object width/height. These properties are synonyms for, and interchangable with, the layerX and layerY event object properties. Syntax: event.x Syntax: event.y METHODS The Event object inherits the watch and unwatch methods of the Object object.