微信小程序开发之左滑修改、删除功能

wxml：

<view class="offer-item" wx:for-items='{{offerList}}'>
    
    
    <view  style="{{item.txtStyle}}">
      <view class="offer-item-top fl clearfix" bindtouchstart="touchS" bindtouchmove="touchM" bindtouchend="touchE"  data-index="{{index}}">
        <navigator bindtap='navigatorTo' data-index="{{item.id}}">
          <view class='content'>
            <view class='title clearfix'>
              <view class='fl'>
                {{item.title}}党建项目报价表
              view>
              <image src='../../images/right.png' class='fr'>image>
            view>
            <view class='note clearfix'>
              <view class='price fl'>
                {{item.create_time}}
              view>
            view>
          view>
        navigator>
      view>

      
      <view bindtap="delItem" class='posit fr isMove' hidden='{{!item.isMove}}'>
          <view class="ref" data-offerid="{{item.id}}" data-index="{{item.id}}" catchtap="ref">
            <image src='../../images/ref.png'>image>
          view>
          <view class="del" data-offerid="{{item.id}}" data-index="{{item.id}}" catchtap="del">
            <image src='../../images/default.png'>image>
          view>
      view>
      
    view>
view>

wxss：

.offer-item {
  height: 150rpx;
  width: 100vw;
  overflow-x: hidden;
  border-bottom: 1px solid #f0f0f0;
}

.offer-item>view {
  position: absolute;
  /* width: calc(100% + 200rpx);  */
  height: 150rpx; 
}

.offer-item .offer-item-top {
  height: 100%;
}

.offer-item .offer-item-top navigator {
  display: inline-block;
  width: 100vw; 
  height: 100%;
}

.offer-item .content {
  padding: 35rpx 30rpx;
  position: relative;
  height: calc(100% - 70rpx);
}

.offer-item .title .fl {
  display: inline-block;
  width: 78%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 30rpx;
  color: #333;
}

.offer-item .title .fr {
  display: inline-block;
  width: 20rpx;
  height: 26rpx;
  margin-top: 5rpx;
}

.offer-item .note {
  position: absolute;
  left: 30rpx;
  bottom: 35rpx;
  width: calc(100vw - 60rpx);
  font-size: 24rpx;
  color: #999;
}

.offer-item .posit {
  width: 200rpx;
  height: 150rpx;
  line-height: 150rpx;
  text-align: center;
  display: none
}

.posit.isMove {
  display: inline-block;
  position: absolute;
}

.posit.isMove[hidden] {
  display: none
}

.offer-item .posit>view {
  display: inline-block;
  width: 100rpx;
}

.offer-item .posit>view:first-of-type {
  background-color: #FED847;
}

.offer-item .posit>view:last-of-type {
  background-color: #C71B1B;
}

.offer-item .posit image {
  display: inline-block;
  width: 36rpx;
  height: 36rpx;
}

js：

let len = 0;         // 初次加载长度
let hadLastPage = false;  // 判断是否到最后一页

var initdata = function (that) {
  var list = that.data.offerList
  for (var i = 0; i < list.length; i++) {
    list[i].txtStyle = "";
    list[i].isMove = false;
  }
  that.setData({ 
    offerList: list
  })
}

Page({
  data: {
    offerList: [

    ],
    delBtnWidth: 100,      // 删除按钮宽度单位（rpx）
  },


  // 手指刚放到屏幕触发
  touchS: function (e) {
    console.log("touchS" + e);
    // initdata(this);
    // 判断是否只有一个触摸点
    if (e.touches.length == 1) {
      this.setData({
        // 记录触摸起始位置的X坐标
        startX: e.touches[0].clientX
      });
    };
    return false;
  },

  // 触摸时触发，手指在屏幕上每移动一次，触发一次
  touchM: function (e) {
    var that = this;
    initdata(that);
    if (e.touches.length == 1) {
      // 记录触摸点位置的X坐标
      var moveX = e.touches[0].clientX;
      // 计算手指起始点的X坐标与当前触摸点的X坐标的差值
      var disX = that.data.startX - moveX;
      // delBtnWidth 为右侧按钮区域的宽度
      var delBtnWidth = that.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个item
      var index = e.currentTarget.dataset.index;
      var list = that.data.offerList;
      // 将拼接好的样式设置到当前item中
      list[index].txtStyle = txtStyle;

      list[index].isMove = true;
      // 更新列表的状态
      this.setData({
        offerList: list
      });
    }
  },
  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 + "px" : "left:0px";
      // 获取手指触摸的是哪一项
      var index = e.currentTarget.dataset.index;
      var list = that.data.offerList;
      list[index].txtStyle = txtStyle;
      // 更新列表的状态
      that.setData({
        offerList: list
      });
    }
  },

  /**
   * 
   */
  navigatorTo: function (event) {

  },

  /**
   * 删除操作
   */
  del: function (e) {
    var that = this;
    var data = {
      id: e.currentTarget.dataset.index
    };
    wx.showModal({
      title: '',
      content: '确定选择删除么？',
      confirmColor: '#C71B1B',
      cancelColor: '#666666',
      success: function (res) {
        if (res.confirm) {
          utils.requestFun("接口url", data, 'POST', function (msg) {
            console.log(msg)

            wx.showToast({
              title: '删除成功',
              icon: 'success',
              duration: 1500
            })
            var lists = that.data.offerList;
            var list1 = [];
            for (let i = 0; i < lists.length; i++) {
              if (lists[i].id != e.currentTarget.dataset.index) {
                list1.push(lists[i])
              }
            }
            len--;
            that.setData({
              offerList: list1
            })
          })
        } else if (res.cancel) {

        }
      }
    })
  },

  /**
   * 修改操作
   */
  ref: function (e) {
    wx.navigateTo({
      url: '修改页面路径?id=' + e.currentTarget.dataset.index,
    })
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    page = 0;
    this.loadList();
  },


  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {
      hadLastPage = false;
      len = 0; 
  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function (event) {
    console.log("上拉事件")
    this.loadList();
  }, 

  /** 
   * 数据请求封装
   */
  loadList: function (event) {
    if (hadLastPage != false) {
      wx.showToast({
        title: '到底啦',
      });
      return;
    }
    var that = this;
    // 显示加载图标  
    wx.showLoading({
      title: '玩命加载中',
    })

    let data = {
        length: len,
        openId: 'openid'
    };
    utils.requestFun("接口url", data, 'POST', function (msg) {

      if (msg.data.length != 0) {
        var lists = that.data.offerList;
        for (let i = 0; i < msg.data.length; i++) {
          msg.data[i].isMove = false;
          lists.push(msg.data[i]);
        }

        // len 
        len = len + msg.data.length;

        // 设置数据  
        that.setData({
          offerList: lists
        })
      } else {
        hadLastPage = true;
      }
      wx.hideLoading();
    })
  }

})

相关请求见request请求封装