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title: Common Events type: wiki group: Event order: 4.1 version: 2.1

Weex provide the ability to let events trigger action, like starting a JavaScript when a user click on a component. Below are the common event attributes that can be added to weex components to define event actions.

Event penetration

**Notes: ** 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, 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.

Event penetration

View interactivity

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

Click event

The onclick attribute fires on a click gesture on the element. **Notes: ** The input and switch component does not currently support the click event, please use change or input event instead.

event object

• type : click
• target : The target component where the event is triggered
• timestamp : Timestamp when event is triggered

Longpress event

If a longpress event is bound to a component, the event will be triggered when user long press on it. **Notes: ** The input and switch component does not currently support the click event, please use change or input event instead.

event object

• type : longpress
• target : The target component where the event is triggered
• timestamp : Timestamp when event is triggered

Appear event

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

• type : appear
• target : The target component where the event is triggered
• timestamp : Timestamp when event is triggered
• direction : The direction in which the scroller is scrolling. Could be up or down.

Disappear event

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

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

stopPropagation

when you want to handler list in list, scroller in list which has touch conflict touch scene. you can use this to control touch dispatch. together with the following attr to achive smooth nest scroll.

shouldStopPropagationInitResult : default true/false,

shouldStopPropagationInterval : control touch call frequency with js. reduce js call with native.

Example

Scroller With List

Page event

Weex provides you with simple management of page status, such as viewappear and viewdisappear. The viewappear event will be triggered when page is about to show or before any animations are configured for showing. For example, when calling push method in navigator module, this event will be trigged in new page. The viewdisappear event will be triggeded when page is about to dismiss. Different from appear and disappear of component, these two events focus on the status of whole page, so they must be bound to the root component. In addititon, these events also can be bound to body component which is not root actually such as wxc-navpage.

event object

• type : viewappear or viewdisappear
• target : The target component where the event is triggered
• timestamp : Timestamp when event is triggered

Example

<template>
  <div>
    <div class="box" @click="onclick" @longpress="onlongpress" @appear="onappear"  @disappear="ondisappear"></div>
  </div>
</template>

<script>
  const modal = weex.requireModule('modal')
  export default {
    methods: {
      onclick (event) {
        console.log('onclick:', event)
        modal.toast({
          message: 'onclick',
          duration: 0.8
        })
      },
      onlongpress (event) {
        console.log('onlongpress:', event)
        modal.toast({
          message: 'onlongpress',
          duration: 0.8
        })
      },
      onappear (event) {
        console.log('onappear:', event)
        modal.toast({
          message: 'onappear',
          duration: 0.8
        })
      },
      ondisappear (event) {
        console.log('ondisappear:', event)
        modal.toast({
          message: 'ondisappear',
          duration: 0.8
        })
      }
    }
  }
</script>

<style scoped>
  .box {
    border-width: 2px;
    border-style: solid;
    border-color: #BBB;
    width: 250px;
    height: 250px;
    margin-top: 250px;
    margin-left: 250px;
    background-color: #EEE;
  }
</style>