微信小程序 向左滑动删除功能的实现
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2022-09-30 08:10:39
微信小程序 向左滑动删除功能的实现
实现效果图:
实现代码:
1、wxml touch-item元素绑定了bindtouchstart、bindtouchmove...
微信小程序 向左滑动删除功能的实现
实现效果图:
实现代码:
1、wxml touch-item元素绑定了bindtouchstart、bindtouchmove事件
<view class="container"> <view class="touch-item {{item.istouchmove ? 'touch-move-active' : ''}}" data-index="{{index}}" bindtouchstart="touchstart" bindtouchmove="touchmove" wx:for="{{items}}" wx:key=""> <view class="content">{{item.content}}</view> <view class="del" catchtap="del" data-index="{{index}}">删除</view> </view> </view>
2、wxss flex布局、css3动画
.touch-item { font-size: 14px; display: flex; justify-content: space-between; border-bottom:1px solid #ccc; width: 100%; overflow: hidden } .content { width: 100%; padding: 10px; line-height: 22px; 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; } .touch-move-active .content, .touch-move-active .del { -webkit-transform: translatex(0); transform: translatex(0); }
3、js 注释很详细
var app = getapp() page({ data: { items: [], startx: 0, //开始坐标 starty: 0 }, onload: function () { for (var i = 0; i < 10; i++) { this.data.items.push({ content: i + " 向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦", istouchmove: false //默认全隐藏删除 }) } this.setdata({ items: this.data.items }) }, //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.items.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, items: this.data.items }) }, //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.items.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({ items: that.data.items }) }, /** * 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); }, //删除事件 del: function (e) { this.data.items.splice(e.currenttarget.dataset.index, 1) this.setdata({ items: this.data.items }) } })
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