小程序外卖订单界面如何实现 小程序外卖订单界面实现代码

本篇文章小编给大家分享一下小程序外卖订单界面实现代码，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

1.效果界面

2.涉及功能

*左侧商品类型、右侧商品可以相互控制；

*商品列表加减及购物车商品加减icon消失、显示；

*商品每一次加减，页面视图变化（数量、价格变化、购物车置灰）；

3.贴上所有代码

1.wxml

  
   
   
    {{item.name}}
   
   
   
    
     
      {{item.name}}
      
       
       
        {{itm.title}}
        {{itm.info}}
        ¥{{itm.price}}
       
       
        
        
        
       
      
     
    
   
  
  
   
    
     
    
    
     
     {{totalNum}}
    
    ¥{{totalMoney}}
   
   去结算
  

  
  
   
    
     已选商品
     清空
    
    
     
      
       {{item.name}}
       
        ¥{{item.price}}
        
         
         
         
        
       
      
     
    
   
  
  
  
   
    
    
     {{goodDetail.title}}
     ¥{{goodDetail.price}}
     {{goodDetail.info}}
    
    
   
  
 

2.script

createPage({
 data: {
  foodsList: [], // 商品数据
  cartList: [], // 购物车数据
  isShowCartMask: false,
  totalNum: 0,
  totalMoney: 0,
  initView: 'item0', // 根据此变量的变化，控制左侧选中状态、右侧滑动
  curId: 'item0',
  isShowDetail: false,
  goodDetail: {},
  screenWidth: 0, // 手机屏幕宽度
  heightArray: [0] // 右侧每一个类型的高度区间数组
 },
 onLoad() {
  this.getGoodsData()
 },
 methods: {
  async getGoodsData() {
   const that = this
   const res = await getGoodsInfo({})
   this.foodsList = res
   wx.getSystemInfo({
    success: (ress) => {
     that.screenWidth = ress.windowWidth
    }
   })
   this.getHeightSection()
  },
  // 设置高度区间 所有单位转化为rpx
  getHeightSection() {
   const that = this
   let hg = 0
   for (let index = 0; index < that.foodsList.length - 1; index++) {
    hg += 70 + that.foodsList[index].list.length * 212
    that.heightArray.push(hg)
   }
  },
  // 获取高度区间的下标
  getHeightIndex(arr, hg) {
   const that = this
   arr.forEach((item, index) => {
    if (hg >= item) {
     that.setData({
      curId: 'item' + index
     })
    }
   })
  },
  // 左边菜单控制右边
  scrollToViewFn(e) {
   this.setData({
    initView: e.target.dataset.id,
    curId: e.target.dataset.id
   })
  },
  // 右边滚动控制左边
  onPageScroll(e) {
   const that = this
   let scrollTop = e.detail.scrollTop * 750 / that.screenWidth
   this.getHeightIndex(that.heightArray, scrollTop)
  },
  // 商品列表的减号点击
  reduceNum(index, ind, item) {
   const that = this
   let val = 'foodsList[' + index + '].list[' + ind + '].num'
   this.setData({
    [val]: item.num - 1
   })
   // 如果商品为0，就把当前商品在购物车清除
   // 如果不为0， 就将当前商品数量减1
   if (that.foodsList[index].list[ind].num === 0) {
    that.removeAarry(that.cartList, item.id)
   } else {
    that.cartList.forEach((itm, i) => {
     if (itm.id === item.id) {
      let value = 'cartList[' + i + '].num'
      that.setData({
       [value]: itm.num - 1
      })
     }
    })
   }
   this.computed()
  },
  // 商品列表的加号点击
  addNum(index, ind, item) {
   const that = this
   let val = 'foodsList[' + index + '].list[' + ind + '].num'
   this.setData({
    [val]: item.num + 1
   })
   // 如果商品为1，就把当前商品加入购物车
   // 否则， 就将当前商品数量加1
   if (that.foodsList[index].list[ind].num === 1) {
    let val = { id: item.id, name: item.title, price: item.price, num: 1, index: index, ind: ind, pic: item.pic }
    that.cartList.push(val)
   } else {
    that.cartList.forEach((itm, i) => {
     if (itm.id === item.id) {
      let value = 'cartList[' + i + '].num'
      that.setData({
       [value]: itm.num + 1
      })
     }
    })
   }
   this.computed()
  },
  // 购物车的减号点击
  reduceCart(index, item) {
   const that = this
   let val = 'foodsList[' + item.index + '].list[' + item.ind + '].num'
   let val1 = 'cartList[' + index + '].num'
   this.setData({
    [val]: item.num - 1,
    [val1]: item.num - 1
   })
   // 如果商品为0，就把当前商品在购物车清除
   // 如果不为0， 就将当前商品数量减1
   if (that.cartList[index].num === 0) {
    that.removeAarry(that.cartList, item.id)
   }
   this.computed()
  },
  // 购物车的加号点击
  addCart(index, item) {
   const that = this
   let val = 'cartList[' + index + '].num'
   that.setData({
    [val]: item.num + 1
   })
   this.computed()
  },
  // 清空购物车
  clearCart() {
   const that = this
   wx.showModal({
    title: '提示',
    content: '清空购物车？',
    success: function (res) {
     if (res.confirm) {
      that.setData({
       cartList: []
      })
      that.foodsList.forEach((item, i) => {
       item.list.forEach((itm, j) => {
        let value = 'foodsList[' + i + '].list[' + j + '].num'
        that.setData({
         [value]: 0
        })
       })
      })
      that.computed()
     }
    }
   })
  },
  // 计算选择商品总价格和总数量
  computed() {
   const that = this
   let num = 0
   let money = 0
   that.cartList.forEach(item => {
    num += item.num
    money += parseFloat(item.price) * item.num
   })
   that.setData({
    totalNum: num,
    totalMoney: money
   })
  },
  // 将数量为0的时候，对应商品在购物车中删除
  removeAarry(arr, id) {
   arr.forEach((item, index) => {
    if (item.id === id) {
     arr.splice(index, 1)
    }
   })
   return arr
  },
  showCartMask() {
   this.isShowCartMask = !this.isShowCartMask
  },
  hiddenCartMak() {
   this.isShowCartMask = false
  },
  stopMaopao() {
  },
  showGoodDetail(item) {
   this.goodDetail = item
   this.isShowDetail = true
  },
  hideDetail() {
   this.isShowDetail = false
  },
  // 订单提交
  submitOrder() {
  }
 }
})

3.css