微信小程序scroll-view实现滚动到锚点左侧导航栏点餐功能(点击种类,滚动到锚点)

1.wxml代码：

<view class="page">
 <import src="../../components/catering-item/catering-item.wxml" />
<!-- 左侧滚动栏 -->
<view class='under_line'></view>
<view class="body">
<view style='float: left' class='left'>
 <scroll-view scroll-y scroll-with-animation scroll-left="{{scrollLength}}" class='scrollY'  style='height: {{winHeight}}px'>
  <view class='all clear'>
   <block wx:key="tabs" wx:for="{{tabs}}">
    <view bindtap='jumpIndex' data-menuindex='{{index}}'data-anchor='{{item.anchor}}'>
     <view class="text-style {{indexId==index?' activeView':''}}">
      <text class="{{indexId==index?'active1':''}}">{{item.title}}</text>
     </view>
    </view>
   </block>
  </view>
 </scroll-view>
</view>
<view class="right" style='height: {{winHeight}}px'>
<scroll-view scroll-y scroll-with-animation scroll-left="{{scrollLength}}" bindscroll="scrollToLeft" scroll-into-view="{{toTitle}}" class='scrollRight' style='height: {{winHeight}}px'>
  <block wx:key="tabs" wx:for="{{tabs}}">
  <view id="view-{{item.anchor}}">
     <view class="title" id="title-{{item.anchor}}">{{item.title}}</view>
     <view class="orders" wx:for="{{tabsList[item.anchor]}}">
      <template is="cateringItem" data="{{...item}}" />
     </view>
    </view>
  </block>
 </scroll-view>
 </view>
</view>
</view>

2.wxss代码：

@import "../../components/catering-item/catering-item.wxss";
/* pages/catering.wxss */
.page {
 display: flex;
 flex-direction: column;
 width: 100%;
 /* background: #F7F4F8; */
 background-image: linear-gradient(90deg, #FCFCFC 0%, #FCFCFC 99%);
 /* padding-top: 16px; */
}
.under_line{
 width: 100%;
 border-top: 1rpx solid #efefef;
}
::-webkit-scrollbar{
  width: 0;
  height: 0;
  color: transparent;
}

.body{
 display: flex;
 width: 100%;
}

.scrollY {
 width: 200rpx;
 /* position: fixed;
 left: 0;
 top: 0; */
 background: #F5F5F5;
 /* border-right: 1rpx solid #efefef; */
}

/* scrollRight{
 flex: 1;
} */
.right{
 flex: 1;
 /* height: 200rpx; */
 /* background: #00FF00; */
}

.left {
 border-top: 1rpx solid #efefef;
 border-right: 1rpx solid #efefef;
}

.text-style {
 width: 200rpx;
 height: 100rpx;
 line-height: 100rpx;
 text-align: center;
 font-size: 28rpx;
 font-family: PingFangSC-Semibold;
 color: rgba(51, 51, 51, 1);
}

.active1 {
 color: #E5D1A9;
 /* background: #FFF; */
}
.activeView{
  background: #FFF;
}

.active {
 display: block;
 width: 50rpx;
 height: 6rpx;
 background: #E5D1A9;
 position: relative;
 left: 75rpx;
 bottom: 30rpx;
}
.title{
 margin-left: 32rpx;
 padding-top: 16rpx;
 font-size: 28rpx;
 /* padding-bottom: 16rpx; */
}

3.js代码

// pages/catering.js
Page({

 /**
  * 页面的初始数据
  */
 data: {
  tabs: [
   { title: '特惠', anchor: 'a', },
   { title: '必点', anchor: 'b', },
   { title: '营养汤', anchor: 'c', },
   { title: '主食', anchor: 'd', },
   { title: '套餐', anchor: 'e', },
   { title: '饮料', anchor: 'f', },
  ],
  tabsList: {
   a: [{
    price: 10.1, anchor: "a", index: 0, num: 0
   }, {
    price: 10.2, anchor: "a", index: 1, num: 0
   },
   {
    price: 10.3, anchor: "a", index: 2, num: 0
   },],
   b: [{
    price: 10.4, anchor: "b", index: 0, num: 0
   }, {
    price: 10.5, anchor: "b", index: 1, num: 0
   },
   {
    price: 10.6, anchor: "b", index: 2, num: 0
   },],
   c: [{
    price: 10.7, anchor: "c", index: 0, num: 0
   }, {
    price: 10.8, anchor: "c", index: 1, num: 0
   },
   {
    price: 10.9, anchor: "c", index: 2, num: 0
   },],
   d: [{
    price: 11.0, anchor: "d", index: 0, num: 0
   }, {
    price: 11.1, anchor: "d", index: 1, num: 0
   },
   {
    price: 11.2, anchor: "d", index: 2, num: 0
   },],
   e: [{
    price: 11.3, anchor: "e", index: 0, num: 0
   }, {
    price: 11.4, anchor: "e", index: 1, num: 0
   },
   {
    price: 11.5, anchor: "e", index: 2, num: 0
   },],
   f: [{
    price: 11.6, anchor: "f", index: 0, num: 0
   }, {
    price: 11.7, anchor: "f", index: 1, num: 0
   },
   {
    price: 11.8, anchor: "f", index: 2, num: 0
   },]
  },
   indexId: 0,
  toTitle:"title-c",
  scrollTop:0,
  top:[],
  },
  // 左侧点击事件
  jumpIndex(e) {
   let index = e.currentTarget.dataset.menuindex;
   let anchor = e.currentTarget.dataset.anchor;
   let that = this
   that.setData({
    indexId: index,
    toTitle: "title-" + anchor
   });
   //可以设置定位事件

  },

 scrollToLeft(res){
  console.log("scrollToLeft-res:" + JSON.stringify(res) + JSON.stringify(this.data.top));
  // let top=res.detail.scrollTop;
  this.setData({
   scrollTop: res.detail.scrollTop
  })
  var length = this.data.top.length;
  for(var i=0;i<this.data.top.length;i++){
   if (this.data.top[i] - this.data.top[0] <= this.data.scrollTop && (i < length - 1 && this.data.top[i + 1] - this.data.top[0] > this.data.scrollTop)){
    if(this.data.indexId!=i){
     this.setData({
      indexId: i,
     });
    }
   }
  }
  // console.log("top:"+top);
 },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
   var that = this
   wx.getSystemInfo({
    success: function (res) {
     that.setData({
      winHeight: res.windowHeight
     });
     var top2=new Array();
     for(var i=0;i<that.data.tabs.length;i++){
      wx.createSelectorQuery().select('#view-' + that.data.tabs[i].anchor).boundingClientRect(function (rect) {

       var isTop=Number(rect.top);

       top2.push(isTop);
       console.log("view-c:" + JSON.stringify(rect));

      }).exec();

     }
     that.setData({
      top: top2
     });
    }

   });

  },

})

说明：

wxml中的template是菜品的item，可根据自己的需求进行定义。

使用到scroll-view的scroll-into-view属性用于对左侧菜单种类点击定位到右侧菜单的具体位置，js中的jumpIndex为用户点击左侧菜单，对应选中位置改变，和对右侧菜单进行定位。

js中scrollToLeft用于实现用户滚动右侧菜单，对左侧菜单分类进行定位操作，主要思想是将右侧菜单中的种类标签的top位置记录下来，当右侧scroll-view滑动的位置小于等于某一个top，而大于下一个top时，则更换左侧种类菜单到指定位置。

总结

到此这篇关于微信小程序scroll-view实现滚动到锚点左侧导航栏点餐功能(点击种类,滚动到锚点)的文章就介绍到这了,更多相关微信小程序 scroll-view实现滚动到锚点内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！