微信小程序滑动滚动导航，滑动指定位置滚动导航

2022-07-08 阅读：3892 分类：后端标签：微信小程序

微信小程序滑动导航，滚动导航选中案例，供大家参考和使用，实现点击头部导航跳转到指定位置，点击底部导航，滑动至指定位置选中及滚动位置。

效果展示：

1、wxml代码：

<!-- 导航栏 -->
<view class="topView">
  <scroll-view class="tabs" scroll-x="true" scroll-with-animation='true' scroll-into-view="x{{xId}}">
    <view class="tab {{xId==item.id?'greenColor':''}}" wx:for="{{list}}" wx:key="item" data-id="{{item.id}}"
      catchtap="changeTab" id="x{{item.id}}">
      <view class="tab_text">{{item.title}}</view>
      <view class="tab_line {{xId==item.id?'greenBg':''}}"></view>
    </view>
  </scroll-view>
</view>


<view style="height:80rpx"></view>


<!-- 滚动内容 -->
<scroll-view class="columns" scroll-y="true" scroll-with-animation='true' scroll-into-view="f{{yId}}"
  style='height:{{height}}rpx;' bindscroll="scrollFloor">
  <view class="column " wx:for="{{list}}" wx:key="item" id="f{{item.id}}">
    <view class="column_title">{{item.title}}</view>
    <view class="column_imgs">
      <view class="img_div" wx:for="{{item.photo}}" wx:for-item="items" wx:key="items">
        <image src="{{items}}" mode="aspectFill"></image>
      </view>
      <view class="img_div" wx:if="{{item.photo.length>7}}">
        <view class="showMore">点击查看更多</view>
      </view>
    </view>
  </view>
  <view style="height:200rpx"></view>
</scroll-view>

2、js代码：

Page({
  data: {
    height: 0,         //页面高度 rpx
    ratio: 0,          //rpx,px转化比
    xId: 1,           //x轴选中项
    yId: 1,           //y轴滚动位置
    heightArray: [],
    list: [{
        id: 1,
        title: "前端",
        photo: [
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg"        ],
      },
      {
        id: 2,
        title: "后端",
        photo: [
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg"
        ],
      },
      {
        id: 3,
        title: "小程序",
        photo: [
          "https://www.tpxhm.com/static/uploads/note/20190103/7c754f8e3362d0fa5a4f6be71818b35e.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg"
        ],
      },
      {
        id: 4,
        title: "PHP",
        photo: [
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg",
        ],
      },
      {
        id: 5,
        title: "JAVA",
        photo: [
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg"
        ],
      },
      {
        id: 6,
        title: "GO",
        photo: [
          "https://www.tpxhm.com/static/uploads/note/20190103/7c754f8e3362d0fa5a4f6be71818b35e.jpg",
          "https://www.tpxhm.com/static/tpl/index/foundation/images/bgtx.jpg"
        ],
      },
    ]
  },

  onLoad: function (options) {
    console.log(222)
    let that = this
    wx.setNavigationBarTitle({
      title: '相册页'
    })
    //1. 获取页面高度
    wx.getSystemInfo({
      success: function (res) {
        let width = res.windowWidth
        let ratio = 750 / width
        let height = ratio * res.windowHeight
       
        that.setData({
          height: height, //单位rpx
          ratio: ratio
        })
      }
    })
  },

  onShow: function () {
    
    let that = this,
      heightArray = [];
    //1.获取滚动元素距离顶部位置-y
    setTimeout(function () {
      let query = wx.createSelectorQuery() //创建节点查询器
      query.selectAll('.column').boundingClientRect(function (rect) {
        rect.forEach(function (value) {
          heightArray.push((value.top - (170 / that.data.ratio)))
        })
        that.setData({
          heightArray
        })
      }).exec()
    }, 1000) //此处最好用延时，否则获取的结果有可能是null，也有可能值不准确。 
  },
//切换tab导航栏
  changeTab: function (e) {
    let that = this
    let id = e.currentTarget.dataset.id
    that.setData({
      xId:id,
      yId:id,
    })
  },

  //监听滚动 切换tab
  scrollFloor: function (e) {
    var that = this
    var scrollTop = e.detail.scrollTop //滚动条距离顶部
    var heightArray = that.data.heightArray //滚动项距离顶部
    var id = null
    //计算比较得出下标
    for (let i = 0; i <= heightArray.length; i++) {
      if (scrollTop >= heightArray[i] - 90 && scrollTop < heightArray[i + 1]) {
        id = that.data.list[i].id
      }
    }
    that.setData({
      xId: id
    })
  },
})

3、wxss样式代码:

.greenColor {
  color: rgb(59 185 80);
}


.greenBg {
  background-color: rgb(59 185 80);
}


.topView {
  position: fixed;
  top:0rpx;
  left:0rpx;
  z-index:999;
  width:100%;
  background-color: #fff;
  height: 80rpx;
}


/* 导航tab */
.tabs {
  white-space: nowrap;
  padding-left: 32rpx;
  width: 100%;
  overflow: hidden;
}


/* 隐藏scroll-view页面滚动条 */
::webkit-scrollbar {
  width: 0;
  height: 0;
  color: #fff;
  display: none;
}


.tabs .tab {
  display: inline-block;
  padding-right: 50rpx;
}


.tab_text {
  height: 50rpx;
  line-height: 50rpx;
  padding-bottom: 10rpx;
}


.tab_line {
  margin: 0 auto;
  width: 30rpx;
  height: 5rpx;
}


/*滚动内容*/
.column {
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}


.column .column_title {
  padding: 40rpx 32rpx 0rpx 32rpx;
}


.column .column_imgs {
  padding: 0 28rpx;
  overflow: hidden;
  margin-top: 15rpx;


}


.column_imgs .img_div {
  width: 230rpx;
  height: 190rpx;
  padding: 7rpx 7rpx;
  box-sizing: border-box;
  float: left;
  display: -webkit-flex;
  -webkit-flex-wrap: nowrap;
  flex-wrap: nowrap;
}


.column_imgs .img_div image {
  width: 100%;
  height: 100%;
  background: #b5b5b5;
}


.column_imgs .img_div .showMore {
  width: 100%;
  height: 100%;
  background: #f3f5f8;
  line-height: 190rpx;
  text-align: center;
  font-size: 28rpx;
  color: #0f0d6b;
}