HTML DOM Event Object

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DOM Document DOM Elements DOM Attributes DOM Events

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# HTML DOM Events

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## HTML DOM Events

HTML DOM events allow JavaScript to register different event handlers on elements in an HTML document.

Events are normally used in combination with functions, and the function will not be executed before the event occurs (such as when a user clicks a button).

Tip: The event model was standardized by the W3C in DOM Level 2.

## HTML DOM Events

DOM: Indicates in which DOM Level the property was introduced.

## Mouse Events

Property | Description | DOM
--- | --- | ---
onclick | The event occurs when the user clicks on an element | 2
ondblclick | The event occurs when the user double-clicks on an element | 2
onmousedown | The event occurs when a user presses a mouse button over an element | 2
onmousemove | The event occurs when the pointer is moving while it is over an element | 2
onmouseover | The event occurs when the pointer is moved onto an element | 2
onmouseout | The event occurs when a user moves the mouse pointer out of an element | 2
onmouseup | The event occurs when a user releases a mouse button over an element | 2

## Keyboard Events

Attribute | Description | DOM
--- | --- | ---
onkeydown | The event occurs when the user is pressing a key | 2
onkeypress | The event occurs when the user presses a key | 2
onkeyup | The event occurs when the user releases a key | 2

## Frame/Object Events

Attribute | Description | DOM
--- | --- | ---
onabort | The event occurs when an image is stopped from loading before completely loaded (for <object>) | 2
onerror | The event occurs when an image does not load properly (for <object>, <body> and <frameset>) |
onload | The event occurs when a document, frameset, or <object> has been loaded | 2
onresize | The event occurs when a document view is resized | 2
onscroll | The event occurs when a document view is scrolled | 2
onunload | The event occurs once a page has unloaded (for <body> and <frameset>) | 2

## Form Events

Attribute | Description | DOM
--- | --- | ---
onblur | The event occurs when a form element loses focus | 2
onchange | The event occurs when the content of a form element, the selection, or the checked state have changed (for <input>, <select>, and <textarea>) | 2
onfocus | The event occurs when an element gets focus (for <label>, <input>, <select>, textarea>, and <button>) | 2
onreset | The event occurs when a form is reset | 2
onselect | The event occurs when a user selects some text (for <input> and <textarea>) | 2
onsubmit | The event occurs when a form is submitted | 2

## Event Object

### Constants

Constant | Description | DOM
--- | --- | ---
CAPTURING_PHASE | The current event phase is the capture phase (3) | 1
AT_TARGET | The current event is in the target phase, i.e. it is being evaluated at the event target (1) | 2
BUBBLING_PHASE | The current event phase is the bubbling phase (2) | 3

### Properties

Property | Description | DOM
--- | --- | ---
bubbles | Returns whether or not an event is a bubbling event | 2
cancelable | Returns whether or not an event can have its default action prevented | 2
currentTarget | Returns the element whose event listeners triggered the event | 2
eventPhase | Returns which phase of the event flow is currently being evaluated | 2
target | Returns the element that triggered the event | 2
timeStamp | Returns the time (in milliseconds relative to the epoch) at which the event was created | 2
type | Returns the name of the event | 2

### Methods

Method | Description | DOM
--- | --- | ---
initEvent() | Specifies the event type, whether or not the event can bubble, whether or not the event's default action can be prevented | 2
preventDefault() | To cancel the event if it is cancelable, meaning that any default action normally taken by the implementation as a result of the event will not occur | 2
stopPropagation() | To prevent further propagation of an event during event flow | 2

## EventTarget Object

### Methods

Method | Description | DOM
--- | --- | ---
addEventListener() | Allows the registration of event listeners on the event target (IE8 = attachEvent()) | 2
dispatchEvent() | Allows to send the event to the subscribed event listeners (IE8 = fireEvent()) | 2
removeEventListener() | Allows the removal of event listeners on the event target (IE8 = detachEvent()) | 2

## EventListener Object

### Methods

Method | Description | DOM
--- | --- | ---
handleEvent() | Called whenever an event occurs of the event type for which the EventListener interface was registered | 2

## DocumentEvent Object

### Methods

Method | Description | DOM
--- | --- | ---
createEvent() |  | 2

## MouseEvent/KeyboardEvent Object

### Properties

Property | Description | DOM
--- | --- | ---
altKey | Returns whether or not the "ALT" key was pressed when an event was triggered | 2
button | Returns which mouse button was clicked when an event was triggered | 2
clientX | Returns the horizontal coordinate of the mouse pointer, relative to the current window, when an event was triggered | 2
clientY | Returns the vertical coordinate of the mouse pointer, relative to the current window, when an event was triggered | 2
ctrlKey | Returns whether or not the "CTRL" key was pressed when an event was triggered | 2
keyIdentifier | Returns the identifier of a key | 3
keyLocation | Returns the location of the key on the device | 3
metaKey | Returns whether or not the "meta" key was pressed when an event was triggered | 2
relatedTarget | Returns the element related to the element that triggered the event | 2
screenX | Returns the horizontal coordinate of the mouse pointer, relative to the screen, when an event was triggered | 2
screenY | Returns the vertical coordinate of the mouse pointer, relative to the screen, when an event was triggered | 2
shiftKey | Returns whether or not the "SHIFT" key was pressed when an event was triggered | 2

### Methods

Method | Description | W3C
--- | --- | ---
initMouseEvent() | Initializes the value of a MouseEvent object | 2
initKeyboardEvent() | Initializes the value of a KeyboardEvent object | 3

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