1.需求

想做类似猫眼电影选场次会自动滚动到屏幕中间的效果

如图是最终效果

2.分析

实现这种效果的方法有三种：

1.直接使用原生CSS+js;

2.使用swiper,一屏显示多个item,点击item会自动滚动到中间

3.使用微信的scroll-view配合JS实现

权衡了一下最终选择了第三个方案，比较是微信自带的方法，使用起来会比较流畅，swiper的话会比较臃肿，原生的话就比较麻烦，需要考虑的兼容问题比较多。

3.代码

wxml

<view class="items-box"> <scroll-view class="scroll-view_H" scroll-x="true" style="width: 100%" bindscroll="scrollMove" scroll-left='{{scrollLeft}}' scroll-with-animation="true"> <view class="scroll-wrapper"> <view id="scroll-item-{{index}}" class="item-pic {{selectItemIndex==index?'on':''}}" wx:for="{{ticketDetails}}" wx:key="index" bindtap="selectItem" data-index="{{index}}" data-name="{{item.TicketTitle}}" data-ticketid='{{item.TicketId}}'> <image src='{{imgUrl}}{{item.TicketPostImg}}'></image> </view> </view> </scroll-view></view><view class="item-name" hidden="{{!selectItemName}}">{{selectItemName}}</view>

wxss

.items-box .item-pic image { width: 90rpx; height: 120rpx;} .items-box .item-pic.on image { width: 110rpx; height: 148rpx; border: 4rpx solid #2bb7b3; box-sizing: border-box;} .items-box .item-pic { margin: 0 20rpx;}.items-box .item-pic:first-child{ padding-left: 300rpx}.items-box .item-pic:last-child{ padding-right: 300rpx}.item-name { padding: 18rpx 0; background-color: #fff; font-size: 24rpx; font-weight: 500; color: #232324; text-align: center;} .items-box .scroll-wrapper { align-items: flex-end; padding: 32rpx 0 0 0;} .items-box .scroll-view_H { border: none; background-color: #edeff1;}

js

data:{ moveParams: { scrollLeft: 0 }} getRect(ele) { //获取点击元素的信息,ele为传入的id var that = this; //节点查询 wx.createSelectorQuery().select(ele).boundingClientRect(function (rect) { console.log(rect) let moveParams = that.data.moveParams; moveParams.subLeft = rect.left; moveParams.subHalfWidth = rect.width / 2; that.moveTo(); }).exec() }, moveTo: function () { let subLeft = this.data.moveParams.subLeft; let screenHalfWidth = this.data.moveParams.screenHalfWidth; let subHalfWidth = this.data.moveParams.subHalfWidth; let scrollLeft = this.data.moveParams.scrollLeft; let distance = subLeft - screenHalfWidth + subHalfWidth; scrollLeft = scrollLeft + distance; this.setData({ scrollLeft: scrollLeft }) }, scrollMove(e) { let moveParams = this.data.moveParams; moveParams.scrollLeft = e.detail.scrollLeft; this.setData({ moveParams: moveParams }) }, //选择项目 selectItem: function (e) { let ele = 'scroll-item-' + e.currentTarget.dataset.index this.getRect('#' + ele); },

首先获取屏幕的宽度，再获取点击元素的宽度，计算一下就可以获得应该滚动的距离，再更改scroll-left='{{scrollLeft}}'即可

微信获取元素宽高的方法

wx.createSelectorQuery().select(ele).boundingClientRect(function (rect) {}).exec()

https://developers.weixin.qq.com/miniprogram/dev/api/wxml/wx.createSelectorQuery.html

总结

到此这篇关于微信小程序点击item使之滚动到屏幕中间的文章就介绍到这了,更多相关微信小程序item滚动到屏幕中间内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持！