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This article mainly introduces the scroll-view component of the WeChat applet in detail to implement scrolling animation. It has a certain reference value. Interested friends can refer to it.
The examples in this article are shared with you. The scroll-view component implements the index list scrolling animation effect for your reference. The specific content is as follows
Implementation principle
Use the scroll-into-view attribute of scroll-view Positioning;
Use the scroll-with-animation attribute of scroll-view to achieve excessive scrolling animation.
WXML
<view class="right-nav"> <view bindtap="getCurrentCode" class="{{chooseIndex == index ? '.city-list-active' : ''}}" wx:for="{{cityList}}" style="height:{{codeHeight}}px" data-code="{{item.code}}" data-index="{{index}}"> {{item.code}} </view> </view> <view class="city-layer {{isShowLayer ? '' : 'layer-hide'}}"> {{codeY}} </view> <view class="current-choose-city">当前选择机场:{{chooseCity}}</view> <scroll-view class="city-scroll" scroll-y="true" scroll-into-view="{{codeY}}" scroll-with-animation="true" style="height:{{cityHeight}}px" bindscroll="scroll"> <view class="city-box" wx:for="{{cityList}}" wx:key="{{item.code}}"> <view class="city-code" id="{{item.code}}">{{item.code}}</view> <view class="city-list" 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 }); } })
Comparison
WeChat Mini Program—National Airports Index list (MUI index list)
Summary of comparison results
Since the scroll-into-view attribute of scroll-view scrolls to the specified id position, so add the id attribute to the letter row of the list;
Since the scroll-into-view attribute of scroll-view realizes scrolling to the specified position, the calculation of scrollTop is reduced. ;
Due to the scroll-with-animation attribute of scroll-view, the scroll animation transition effect is achieved;
Reduces the cycle of calculating scrollTop Consumption;
#The amount of js code is reduced, and the variable setting of this.setData method is reduced.
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
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