小程序事件处理

<!--pages/06_learn_event/index.wxml-->
<!-- 1.事件的基本使用 -->
<button bindtap="onBtnTap">按钮</button>

<!-- 2.event中target和currentTarget区别 -->
<view id="outer" class="outer" data-name="why" bindtap="onOuterViewTap">
  <view id="inner" class="inner"></view>
</view>

<!-- 3.event中touches和changeTouches区别 -->
<view
  class="touches"
  bindtap="onTouchTap"
  bindlongpress="onLongPress"
  bindtouchend="onTouchEnd"
>
  多指触摸
</view>

<!-- 4.event的参数传递 -->
<view 
  class="arguments"
  bindtap="onArgumentsTap"
  data-name="why"
  data-age="18"
  data-height="1.88"
>
  参数传递
</view>


<!-- 5.tab-control案例(重要) -->
<view class="tab-control">
  <block wx:for="{{ titles }}" wx:key="*this">
    <view 
      class="item {{index === currentIndex ? 'active': ''}}"
      bindtap="onItemTap"
      data-index="{{index}}"
    >
      <text class="title">{{ item }}</text>
    </view>
  </block>
</view>

<!-- 6.捕获和冒泡阶段 -->
<view class="view1" capture-bindtap="onView1CaptureTap" bindtap="onView1Tap">
  <view class="view2" capture-bindtap="onView2CaptureTap" bindtap="onView2Tap">
    <view class="view3" capture-bindtap="onView3CaptureTap" bindtap="onView3Tap"></view>
  </view>
</view>

<!-- 7.将bind替换为catch: 阻止事件仅一步传递(了解) -->


<!-- 8.给逻辑传递数据, 另外一种方式: mark -->
<view 
  class="mark"
  bindtap="onMarkTap"
  data-name="why"
  data-age="18"
  mark:name="kobe"
  mark:age="30"
>
 <text mark:address="洛杉矶" class="title">mark</text>
</view>

// pages/06_learn_event/index.js
Page({
  data: {
    titles: ["手机", "电脑", "iPad", "相机"],
    currentIndex: 0
  },

  onItemTap(event) {
    const currentIndex = event.currentTarget.dataset.index
    console.log(currentIndex);
    this.setData({ currentIndex })
  },

  // 绑定事件监听函数
  onBtnTap(event) {
    console.log("onBtnTap:", event);
  },
  onOuterViewTap(event) {
    // 1.target触发事件的元素
    // 2.currentTarget处理事件的元素
    console.log("onOuterViewTap:", event);
    console.log(event.target);
    console.log(event.currentTarget);

    // 3.获取自定义属性: name
    const name = event.currentTarget.dataset.name
    console.log(name);
  },

  // 监听触摸事件
  onTouchTap(event) {
    console.log("tap:", event);
  },
  onLongPress(event) {
    console.log("long:", event);
  },
  onTouchEnd(event) {
    console.log("end:", event);
  },

  // 监听事件, 并且传递参数
  onArgumentsTap(event) {
    console.log("onArgumentsTap:", event);
    const { name, age, height } = event.currentTarget.dataset
    console.log(name, age, height);
  },

  // 捕获和冒泡过程
  onView1CaptureTap() {
    console.log("onView1CaptureTap");
  },
  onView2CaptureTap() {
    console.log("onView2CaptureTap");
  },
  onView3CaptureTap() {
    console.log("onView3CaptureTap");
  },
  onView1Tap() {
    console.log("onView1Tap");
  },
  onView2Tap() {
    console.log("onView2Tap");
  },
  onView3Tap() {
    console.log("onView3Tap");
  },

  // mark的数据传递
  onMarkTap(event) {
    console.log(event);
    const data1 = event.target.dataset
    console.log(data1);

    const data2 = event.mark
    console.log(data2);
  }
})