How to use scroll-view component to implement scrolling animation in WeChat applet

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

  {{item.code}}    {{codeY}}  当前选择机场：{{chooseCity}}   {{item.code}}  {{city}}   

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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