click

click 事件通常會在設備的按鈕（通常是滑鼠按鍵）點擊元素時執行。

基本資料

詳述: DOM L3
介面: MouseEvent
Bubbles: Yes
Cancelable: Yes
Target: 網頁元素
Default Action: Varies

Properties

Property	Type	Description
`target` Read only	`EventTarget`	The event target (the topmost target in the DOM tree).
`type` Read only	`DOMString`	The type of event.
`bubbles` Read only	`Boolean`	Whether the event normally bubbles or not
`cancelable` Read only	`Boolean`	Whether the event is cancellable or not?
`view` Read only	`WindowProxy`	`document.defaultView` (`window` of the document)
`detail` Read only	`long` (`float`)	A count of consecutive clicks that happened in a short amount of time, incremented by one.
`currentTarget` Read only	EventTarget	The node that had the event listener attached.
`relatedTarget` Read only	EventTarget	For `mouseover`, `mouseout`, `mouseenter` and `mouseleave` events: the target of the complementary event (the `mouseleave` target in the case of a `mouseenter` event). `null` otherwise.
`screenX` Read only	long	The X coordinate of the mouse pointer in global (screen) coordinates.
`screenY` Read only	long	The Y coordinate of the mouse pointer in global (screen) coordinates.
`clientX` Read only	long	The X coordinate of the mouse pointer in local (DOM content) coordinates.
`clientY` Read only	long	The Y coordinate of the mouse pointer in local (DOM content) coordinates.
`button` Read only	unsigned short	The button number that was pressed when the mouse event was fired: Left button=0, middle button=1 (if present), right button=2. For mice configured for left handed use in which the button actions are reversed the values are instead read from right to left.
`buttons` Read only	unsigned short	The buttons being pressed when the mouse event was fired: Left button=1, Right button=2, Middle (wheel) button=4, 4th button (typically, "Browser Back" button)=8, 5th button (typically, "Browser Forward" button)=16. If two or more buttons are pressed, returns the logical sum of the values. E.g., if Left button and Right button are pressed, returns 3 (=1 \| 2). More info.
`mozPressure` Read only	float	The amount of pressure applied to a touch or tabdevice when generating the event; this value ranges between 0.0 (minimum pressure) and 1.0 (maximum pressure).
`ctrlKey` Read only	boolean	`true` if the control key was down when the event was fired. `false` otherwise.
`shiftKey` Read only	boolean	`true` if the shift key was down when the event was fired. `false` otherwise.
`altKey` Read only	boolean	`true` if the alt key was down when the event was fired. `false` otherwise.
`metaKey` Read only	boolean	`true` if the meta key was down when the event was fired. `false` otherwise.

範例

<div id="test"></div>

<script>
  document.getElementById("test").addEventListener("click", function( event ) {
    // 在 “clicked div”顯示點擊次數
    event.target.innerHTML = "click count: " + event.detail;
  }, false);
</script>

Browser compatibility

Internet Explorer

Internet Explorer 8 & 9 suffer from a bug where elements with a computed background-color of transparent that are overlaid on top of other element(s) won't receive click events. Any click events will be fired at the underlying element(s) instead. See this live example for a demonstration.

Known workarounds for this bug:

For IE9 only:
- Set background-color: rgba(0,0,0,0)
- Set opacity: 0 and an explicit background-color other than transparent
For IE8 and IE9: Set filter: alpha(opacity=0); and an explicit background-color other than transparent

Safari Mobile

Safari Mobile 7.0+ (and likely earlier versions too) suffers from a bug where click events aren't fired on elements that aren't typically interactive (e.g. <div>) and which also don't have event listeners directly attached to the elements themselves (i.e. event delegation is being used). See this live example for a demonstration. See also Safari's docs on making elements clickable and the definition of "clickable element".