微信小程序左滑删除

<view class="touch-item {{item.isTouchMove ? 'touch-move-active' : ''}}" data-index="{{index}}" wx:for="{{list}}" wx:key>
　　<view class="content">
　　　　<view style="{{item.txtStyle}}" class='item' data-index='{{index}}' bindtouchstart="touchstart" bindtouchmove="touchmove" bindtouchend="touchE">
　　　　　　<view class='title'>{{item.title}}</view>
　　　　　　　　<view class='content'>{{item.message}}</view>
　　　　　　　　<text>{{item.create_time}}</text>
　　　　　　</view>
　　　　</view>
　　<view class="del" data-id="{{item.id}}" catchtap="delBtn" data-index="{{index}}">删除</view>
　　</view>
</view>

.touch-item {
display: flex;
justify-content: space-between;
width: 100%;
overflow: hidden;
margin-bottom: 10rpx;
background: #fff;
height: 216rpx;
}

.content {
width: 100%;
margin-right: 0;
-webkit-transition: all 0.4s;
transition: all 0.4s;
-webkit-transform: translateX(90px);
transform: translateX(90px);
margin-left: -90px;
}

.del {
background-color: orangered;
width: 90px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
color: #fff;
-webkit-transform: translateX(90px);
transform: translateX(90px);
-webkit-transition: all 0.4s;
transition: all 0.4s;
font-size: 35rpx;
}

.touch-move-active .content, .touch-move-active .del {
-webkit-transform: translateX(0);
transform: translateX(0);
}

data: {
startX: 0, //开始坐标
startY: 0,
page: 1
},
touchE: function(e) {
// console.log(e);
var that = this
if (e.changedTouches.length == 1) {
//手指移动结束后触摸点位置的X坐标
var endX = e.changedTouches[0].clientX;
//触摸开始与结束，手指移动的距离
var disX = that.data.startX - endX;
var delBtnWidth = that.data.delBtnWidth;
//如果距离小于删除按钮的1/2，不显示删除按钮
var txtStyle = disX > delBtnWidth / 2 ? "left:-" + delBtnWidth + "rpx" : "left:0rpx";

//获取手指触摸的是哪一项
var index = e.currentTarget.dataset.index;
var list = that.data.list;
list[index].txtStyle = txtStyle;
//更新列表的状态
that.setData({
list: list
});
}
},
//手指触摸动作开始 记录起点X坐标
touchstart: function(e) {
//开始触摸时 重置所有删除
this.data.list.forEach(function(v, i) {
if (v.isTouchMove) //只操作为true的
v.isTouchMove = false;
})
this.setData({
startX: e.changedTouches[0].clientX,
startY: e.changedTouches[0].clientY,
list: this.data.list
})
},
//滑动事件处理
touchmove: function(e) {
var that = this,
index = e.currentTarget.dataset.index, //当前索引
startX = that.data.startX, //开始X坐标
startY = that.data.startY, //开始Y坐标
touchMoveX = e.changedTouches[0].clientX, //滑动变化坐标
touchMoveY = e.changedTouches[0].clientY, //滑动变化坐标
//获取滑动角度
angle = that.angle({
X: startX,
Y: startY
}, {
X: touchMoveX,
Y: touchMoveY
});
that.data.list.forEach(function(v, i) {
v.isTouchMove = false
//滑动超过30度角 return
if (Math.abs(angle) > 30) return;
if (i == index) {
if (touchMoveX > startX) //右滑
v.isTouchMove = false
else //左滑
v.isTouchMove = true
}
})
//更新数据
that.setData({
list: that.data.list
})
},
/**
* 计算滑动角度
* @param {Object} start 起点坐标
* @param {Object} end 终点坐标
*/
angle: function(start, end) {
var _X = end.X - start.X,
_Y = end.Y - start.Y
//返回角度 /Math.atan()返回数字的反正切值
return 360 * Math.atan(_Y / _X) / (2 * Math.PI);
},

标签：左滑,startX,translateX,删除,微信,list,坐标,var,data
来源： https://www.cnblogs.com/caoyuna/p/11474405.html