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微信小程序 侧滑删除(左滑删除)

微信互联网报道2932018-02-08 收藏0次评论

如图所示,demo是小程序的侧滑删除,这个是我在别人写的例子的基础上修改的。代码如下

js文件代码:

// pages/leftSwiperDel/index.js  
  
var initdata = function (that) {  
  var list = that.data.list  
  for (var i = 0; i < list.length; i++) {  
    list[i].txtStyle = ""  
  }  
  that.setData({ list: list })  
}  
  
Page({  
  data: {  
    delBtnWidth: 180,//删除按钮宽度单位(rpx)  
    list: [  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
      {  
        txtStyle: "",  
        icon: "/images/qcm.png",  
        txt: "指尖快递"  
      },  
  
    ]  
  },  
  onLoad: function (options) {  
    // 页面初始化 options为页面跳转所带来的参数  
    this.initEleWidth();  
  },  
  onReady: function () {  
    // 页面渲染完成  
  },  
  onShow: function () {  
    // 页面显示  
  },  
  onHide: function () {  
    // 页面隐藏  
  },  
  onUnload: function () {  
    // 页面关闭  
  },  
  touchS: function (e) {  
    if (e.touches.length == 1) {  
      this.setData({  
        //设置触摸起始点水平方向位置  
        startX: e.touches[0].clientX  
      });  
    }  
  },  
  touchM: function (e) {  
    var that = this  
    initdata(that)  
    if (e.touches.length == 1) {  
      //手指移动时水平方向位置  
      var moveX = e.touches[0].clientX;  
      //手指起始点位置与移动期间的差值  
      var disX = this.data.startX - moveX;  
      var delBtnWidth = this.data.delBtnWidth;  
      var txtStyle = "";  
      if (disX == 0 || disX < 0) {//如果移动距离小于等于0,文本层位置不变  
        txtStyle = "left:0px";  
      } else if (disX > 0) {//移动距离大于0,文本层left值等于手指移动距离  
        txtStyle = "left:-" + disX + "px";  
        if (disX >= delBtnWidth) {  
          //控制手指移动距离最大值为删除按钮的宽度  
          txtStyle = "left:-" + delBtnWidth + "px";  
        }  
      }  
      //获取手指触摸的是哪一项  
      var index = e.target.dataset.index;  
      var list = this.data.list;  
      list[index].txtStyle = txtStyle;  
      //更新列表的状态  
      this.setData({  
        list: list  
      });  
    }  
  },  
  
  touchE: function (e) {  
    if (e.changedTouches.length == 1) {  
      //手指移动结束后水平位置  
      var endX = e.changedTouches[0].clientX;  
      //触摸开始与结束,手指移动的距离  
      var disX = this.data.startX - endX;  
      var delBtnWidth = this.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 + "px" : "left:0px";  
      //获取手指触摸的是哪一项  
      var index = e.target.dataset.index;  
      var list = this.data.list;  
      list[index].txtStyle = txtStyle;  
      //更新列表的状态  
      this.setData({  
        list: list  
      });  
    }  
  },  
  //获取元素自适应后的实际宽度  
  getEleWidth: function (w) {  
    var real = 0;  
    try {  
      var res = wx.getSystemInfoSync().windowWidth;  
      var scale = (750 / 2) / (w / 2);//以宽度750px设计稿做宽度的自适应  
      // console.log(scale);  
      real = Math.floor(res / scale);  
      return real;  
    } catch (e) {  
      return false;  
      // Do something when catch error  
    }  
  },  
  initEleWidth: function () {  
    var delBtnWidth = this.getEleWidth(this.data.delBtnWidth);  
    this.setData({  
      delBtnWidth: delBtnWidth  
    });  
  },  
  //点击删除按钮事件  
  delItem: function (e) {  
    var that = this  
    wx.showModal({  
      title: '提示',  
      content: '是否删除?',  
      success: function (res) {  
        if (res.confirm) {  
          //获取列表中要删除项的下标  
          var index = e.target.dataset.index;  
          var list = that.data.list;  
          //移除列表中下标为index的项  
          list.splice(index, 1);  
          //更新列表的状态  
          that.setData({  
            list: list  
          });  
        } else {  
          initdata(that)  
        }  
      }  
    })  
  
  }  
  
})  

wxss文件代码:

/* pages/leftSwiperDel/index.wxss */  
view{  
    box-sizing: border-box;  
}  
.item-box{  
    width: 700rpx;  
    margin: 0 auto;  
    padding:40rpx 0;  
}  
.items{  
    width: 100%;  
}  
.item{  
    position: relative;  
    border-top: 2rpx solid #eee;  
    height: 120rpx;  
    line-height: 120rpx;  
    overflow: hidden;  
}  
.item:last-child{  
    border-bottom: 2rpx solid #eee;  
}  
.inner{  
    position: absolute;  
    top:0;  
}  
.inner.txt{  
    background-color: #fff;  
    width: 100%;  
    z-index: 5;  
    padding:0 10rpx;  
    transition: left 0.2s ease-in-out;  
    white-space:nowrap;  
    overflow:hidden;  
    text-overflow:ellipsis;  
}  
.inner.del{  
    background-color: #e64340;  
    width: 180rpx;text-align: center;  
    z-index: 4;  
    right: 0;  
    color: #fff  
}  
.item-icon{  
    width: 64rpx;  
    vertical-align: middle;  
    margin-right: 16rpx  
}  
.thumb{  
    width: 200px;  
    height: 200px;  
    -webkit-overflow-scrolling: touch;  
    overflow: scroll;  
}  

wxml文件代码:

<view class="item-box">  
  <view class="items">  
    <view wx:for="{{list}}"  wx:key="{{index}}"  class="item">  
      <view bindtouchstart="touchS" bindtouchmove="touchM" bindtouchend="touchE" data-index="{{index}}" {{item.txtStyle}}" class="inner txt">  
      <image class="item-icon" mode="widthFix" src="{{item.icon}}"></image>{{index}}{{item.txt}}</view>  
      <view data-index="{{index}}" bindtap = "delItem" class="inner del">删除</view>  
    </view>  
  </view>  
</view>  

 

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