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本文实例为大家分享了Vue实现列表滚动过渡动画的具体代码,供大家参考,具体内容如下
效果图
失帧比较严重,在手机上效果更佳。
原理分析
这个滚动页面由两个部分布局(底部固定的Tab页面除外)。一个是顶部的banner轮播,一个是下面的列表。这里的重点是做列表的动画,banner轮播的网上资料很多,请自行查找。
这个动画最重要的是在滚动中实时计算startIndex和endIndex,动画比较简单,就是scale和opacity的变化。向下滚动时,startIndex变小;向上滚动时,endIndex变大时,新露脸的项做该动画。当滚动连起来,就是一个完整的动画了。
涉及的技术
使用better-scroll做滚动以及轮播图
使用create-keyframe-animation做动画控制
实现步骤
1、vue的template部分
注意:由于IOS渲染速度比较快, 必须把没有展现在首屏的页面上的item隐藏掉,即index比startIndex小、比endIndex大的item都应该隐藏,避免页面动画混乱。
<div class="area-wrapper" ref="areaWrapper"> <div v-for="(item, index) in areaList" :key="index" @click="clickAreaItem(item.id)" :ref="'area-' + index" class="area" :style="{ backgroundImage: 'url('+item.thumbUrl+')', 'opacity': (index < startIndex || index > endIndex) "> <div class="content"> <h2 class="num">{{item.num}}</h2> <div style="vertical-align:text-bottom"> <p class="name">{{item.name}}</p> <p class="desc">{{item.desc}}</p> </div> </div> </div> </div>
高度预设。用于计算startIndex、endIndex
const AreaItemHeight = 119 // 每一项的高度(这里默认一致,如果不一致请自行修改startIndex、endIndex的计算方式) const MarginBottom = 15 // 列表项的底部边距 const TopHeight = 160 // banner的高度 const BottomHeight = 50 // 底部Tab的高度
监听滚动。并实时计算startIndex、endIndex
scroll (position) { const scrollY = position.y if (scrollY < 0) { // startIndex计算 const currentStartIndex = Math.abs(scrollY) <= TopHeight "htmlcode">runAnimation (index) { animations.registerAnimation({ name: 'scale', animation: [ { scale: 0.5, opacity: 0 }, { scale: 1, opacity: 1 } ], presets: { duration: 300, resetWhenDone: true } }) animations.runAnimation(this.$refs['area-' + index], 'scale') }完整代码
.vue文件
<template> <div class="address-wrapper" style="height: 100%;"> <scroll ref="scroll" class="address-content" :data="areaList" @scroll="scroll" :listen-scroll="listenScroll" :probe-type="probeType" :bounce="false"> <div> <div v-if="bannerList.length" style="position: relative;"> <slider :list="bannerList"> <div v-for="item in bannerList" :key="item.id" :style="{height: sliderHeight + 'px'}"> <img class="needsclick" :src="/UploadFiles/2021-04-02/item.thumbUrl">本地json文件,请自行修改图片路径
bannerAddress.json
[ { "id": 1, "contentId": 111111, "type": 1, "thumbUrl": "./static/img/banner/banner_address_1.jpg" }, { "id": 2, "contentId": 111111, "type": 1, "thumbUrl": "./static/img/banner/banner_address_2.jpg" }, { "id": 3, "contentId": 111111, "type": 1, "thumbUrl": "./static/img/banner/banner_address_3.jpg" } ]areaList.json
[ { "id": "ba062c32fdf611e7ba2d00163e0c27f8", "name": "凯里", "desc": "这是凯里哟~", "num": 17, "thumbUrl": "./static/img/area/kaili.png" }, { "id": "ba5287a7fdf611e7ba2d00163e0c27f8", "name": "丹寨", "desc": "这是丹寨哟~", "num": 8, "thumbUrl": "./static/img/area/danzai.png" }, { "id": "ba9da079fdf611e7ba2d00163e0c27f8", "name": "麻江", "desc": "这是麻江哟~", "num": 12, "thumbUrl": "./static/img/area/majiang.png" }, { "id": "baeb0926fdf611e7ba2d00163e0c27f8", "name": "黄平", "desc": "这是黄平哟~", "num": 7, "thumbUrl": "./static/img/area/huangping.png" }, { "id": "bb357191fdf611e7ba2d00163e0c27f8", "name": "施秉", "desc": "这是施秉哟~", "num": 6, "thumbUrl": "./static/img/area/shibing.png" }, { "id": "bb842d8ffdf611e7ba2d00163e0c27f8", "name": "镇远", "desc": "这是镇远哟~", "num": 3, "thumbUrl": "./static/img/area/zhenyuan.png" }, { "id": "bbce67dffdf611e7ba2d00163e0c27f8", "name": "岑巩", "desc": "这是岑巩哟~", "num": 23, "thumbUrl": "./static/img/area/cengong.png" }, { "id": "bc198ca9fdf611e7ba2d00163e0c27f8", "name": "三穗", "desc": "这是三穗哟~", "num": 66, "thumbUrl": "./static/img/area/sansui.png" }, { "id": "bc64498bfdf611e7ba2d00163e0c27f8", "name": "天柱", "desc": "这是天柱哟~", "num": 128, "thumbUrl": "./static/img/area/tianzhu.png" }, { "id": "bcaf466bfdf611e7ba2d00163e0c27f8", "name": "锦屏", "desc": "这是锦屏哟~", "num": 107, "thumbUrl": "./static/img/area/jinping.png" }, { "id": "bcfa6f1bfdf611e7ba2d00163e0c27f8", "name": "黎平", "desc": "这是黎平哟~", "num": 211, "thumbUrl": "./static/img/area/liping.png" }, { "id": "bd44cca9fdf611e7ba2d00163e0c27f8", "name": "从江", "desc": "这是从江哟~", "num": 17, "thumbUrl": "./static/img/area/congjiang.png" }, { "id": "bd8f5cd4fdf611e7ba2d00163e0c27f8", "name": "榕江", "desc": "这是榕江哟~", "num": 17, "thumbUrl": "./static/img/area/rongjiang.png" }, { "id": "bdda2928fdf611e7ba2d00163e0c27f8", "name": "雷山", "desc": "这是雷山哟~", "num": 17, "thumbUrl": "./static/img/area/leishan.png" }, { "id": "be25afc0fdf611e7ba2d00163e0c27f8", "name": "台江", "desc": "这是台江哟~", "num": 17, "thumbUrl": "./static/img/area/taijiang.png" }, { "id": "be702db5fdf611e7ba2d00163e0c27f8", "name": "剑河", "desc": "这是剑河哟~", "num": 17, "thumbUrl": "./static/img/area/jianhe.png" } ]关于vue.js组件的教程,请大家点击专题vue.js组件学习教程进行学习。
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