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Weex 提供了通过事件触发动作的能力，例如在用户点击组件时执行 JavaScript。 Weex provides the ability to trigger actions through events, such as executing JavaScript when the user clicks on a component. Below are the common event attributes that can be added to weex components to define event actions.

Event penetration

The principle of native event delivery under Android and iOS is different, only for iOS here.

When a parent view has multiple peer views, iOS will select the highest level View to respond to the event, and the underlying view event will never be responded.

Weex add attribute eventPenetrationEnabled to <div> component. When the value is true(default would be false), the view's children views still respond to the event normally, while the view itself will not respond to the event, but pass the event to the lower level View.

View interactivity

iOS only

Weex add attribute userInteractionEnabled to <div> component. When the value is false(default would be true), neither the view nor its children views respond to the event. The event is passed to the lower layer View.

longpress

If a longpress event is bound to a component, the event will be triggered when user long press on it.

event object

key	value	Remark
type	longpress
target		The target component where the event is triggered
timestamp		Timestamp when event is triggered

Appear

If a appear event is bound to a component inside a scrollable container, the event will be triggered when the component comes to be visible.

event object

key	value	notes
type	appear
target		The target component where the event is triggered
timestamp		Timestamp when event is triggered
direction	upor down	The direction in which the scroller is scrolling.

Disappear

If a disappear event is bound to a component inside a scrollable container, the event will be triggered when the component scrolls out of viewport and disappears from your sight.

event object

key	value	Remark
type	disappear
target		The target component where the event is triggered
timestamp		Timestamp when event is triggered
direction	upor down	The direction in which the scroller is scrolling. Could be up or down