view组件实现滚动动画

利用scroll-view的scroll-into-view属性进行定位;
利用scroll-view的scroll-with-animation属性实现滚动动画过度。

WXML

<view> <view bindtap="getCurrentCode" wx:for="{{cityList}}" data-code="{{item.code}}" data-index="{{index}}"> {{item.code}} </view> </view> <view> {{codeY}} </view> <view>当前选择机场:{{chooseCity}}</view> <scroll-view scroll-y="true" scroll-into-view="{{codeY}}" scroll-with-animation="true" bindscroll="scroll"> <view wx:for="{{cityList}}" wx:key="{{item.code}}"> <view>{{item.code}}</view> <view wx:for="{{item.cityList}}" wx:for-item="city" bindtap="getChooseCity" data-city="{{city}}"> {{city}} </view> </view> </scroll-view>

WXSS

.current-choose-city{ position: fixed; width: 100%; height: 50px; line-height: 50px; padding: 0 10px; top: 0; left: 0; background-color: #fff; z-index: 10; } .right-nav{ width: 30px; color: #888; text-align: center; position: fixed; bottom: 0; right: 0; background-color: rgb(200, 200, 200); z-index: 9; } .city-scroll{padding-top: 50px;} .city-code{ background-color: #f7f7f7; } .city-list,.city-code{ height: 39px; line-height: 40px; padding: 0 30px 0 10px; overflow: hidden; border-bottom: 1px solid #c8c7cc; } .city-list-active{color:#007aff;} /*提示点击的字母 */ .city-layer{ width: 70px; height: 70px; line-height: 70px; text-align: center; border-radius: 50%; color: #fff; background-color: rgba(0, 0, 0, .7); position: fixed; top: calc(50% - 35px); left:calc(50% - 35px); z-index: 11; } .layer-hide{display: none;}

JS

var city_list = require('./city.js'); Page({ data: { cityList: city_list.city, chooseCity: '您还未选择机场!', isShowLayer: false, chooseIndex: 0, codeY: 'A', codeHeight: null, cityHeight:null }, onLoad (options) { var windowHeight = wx.getSystemInfoSync().windowHeight; this.setData({ codeHeight: (windowHeight - 50) / this.data.cityList.length, cityHeight: windowHeight - 50, }); }, getCurrentCode(e){ var self = this; this.setData({ codeY: e.target.dataset.code, chooseIndex: e.target.dataset.index, isShowLayer: true }) setTimeout(() => { self.setData({ isShowLayer: false }) },500); }, getChooseCity(e){ this.setData({ chooseCity: e.target.dataset.city }); } })

对比

微信小程序—-全国机场索引列表(MUI索引列表)

对比结果总结

由于scroll-view的scroll-into-view属性是滚动到指定id位置,所以,在列表的字母行加上id属性;

由于scroll-view的scroll-into-view属性实现了滚动到指定位置,所以减少了scrollTop的计算;

由于scroll-view的scroll-with-animation属性,实现了滚动动画过度效果;

减少了计算scrollTop的循环消耗;

js代码量减少,减少this.setData方法的变量设置。

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