vant list组件滚动保留滚动条位置
作者:牛先森家的牛奶
这篇文章主要介绍了vant list组件滚动保留滚动条位置,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
vant list组件滚动保留滚动条位置,需结合keepAlive使用,分享此篇,供大家参考。
1、保存位置的前提是用的keepAlive组件来做缓存,app.vue代码
<template> <div id="app"> <keep-alive> <router-view v-if='$route.meta.keepAlive'/> </keep-alive> <router-view v-if='!$route.meta.keepAlive'/> </div> </template>
2、在路由文件router.js,给每个路由meta添加scrollTop和keepAlive
{ path: '/home', name: 'home', component: resolve => require(['@/views/home/index.vue'], resolve), meta: { title: '首页', index: 1, keepAlive: true, scrollTop: 0 } }, { path: '/classify', name: 'classify', component: resolve => require(['@/views/classify/index.vue'], resolve), meta: { title: '分类', index: 1, keepAlive: true, scrollTop: 0 } }, { path: '/shopping', name: 'shopping', component: resolve => require(['@/views/shopping/index.vue'], resolve), meta: { title: '购物车', index: 1, keepAlive: true, scrollTop: 0 } }, { path: '/detail', name: 'detail', component: resolve => require(['@/views/detail/index.vue'], resolve), meta: { title: '详情', index: 2, // keepAlive: true, // scrollTop: 0 } },
3、然后在main.js,记录滚动条的位置
router.beforeEach((to, from, next) => { if (from.meta.keepAlive) { const $wrapper = document.querySelector('.app-wrapper'); // 列表的外层容器 注意找到滚动的盒子 const scrollTop = $wrapper ? $wrapper.scrollTop : 0; console.log('scrollTop=', scrollTop) from.meta.scrollTop = scrollTop; } next(); });
4、最后在需要记录保留滚动条位置的地方获取通过activated(这个函数每次进入页面都会执行,只有结合使用keepAlive组件才有效)来获取scrollTop
activated () { const scrollTop = this.$route.meta.scrollTop; const $wrapper = document.querySelector('.app-wrapper'); if (scrollTop && $wrapper) { $wrapper.scrollTop = scrollTop; } },
比如缓存了某些页面也不想随之滚动,则把scrollTop置0即可;
activated() { const $wrapper = document.querySelector(".app-wrapper"); $wrapper.scrollTop = 0; },
注意,页面滚动的话,其他页面有滚动条的也会随之滚动,可以对其他页面里面处理,或者判断是否从详情页到列表页来判断是否缓存位置,如果不是,则回到顶部,但是注意路由钩子函数this的使用;