【h5 uniapp】滚动滚动条，数据跟着变化

uniapp项目

在这里插入图片描述

需求：
向下滑动时，数据增加，上方的日历标题日期也跟着变化
向上滑动时，上方的日历标题日期跟着变化

实现思路：

初次加载目前月份的数据以及下个月的数据 this.getdate()
触底加载下个月份的数据 onReachBottom（）
向上滑动，监听页面滚动onPageScroll（）得到距离顶部的高度 res.scrollTop
距离顶部的高度除以每个数据块的高度再向下取整，得到的数与数据的下标做对比刚好等于的说明正停留在这个数据块，再把数据中的年和月赋值给标签（具体代码实现在 onPageScroll 函数里）

全文源码

<template>
	<view class="u-p-b-150">
		<u-sticky>
			<view class="flex_spacebetween u-p-l-40 u-p-r-32 u-p-y-22 u-bg-007 u-color-fff">
				<view class="u-flex u-f-s-38 u-f-w-600 u-c-p" @click.stop="">
					<view>{{yue | MonthTrans}} {{nian}}</view>
					<image src="@/static/img/law/you1.png" mode="" class="u-w-32 u-h-32 u-m-l-24"></image>
				</view>
				<view class="bianji" @click.stop="$u.route('/pages/time/edit')">Edit</view>
			</view>
			<!-- 周几 -->
			<view class="riqi u-flex u-p-x-24">
				<view>Mon</view>
				<view>Tue</view>
				<view>Wed</view>
				<view>Thu</view>
				<view>Fri</view>
				<view>Sat</view>
				<view>Sun</view>
			</view>
		</u-sticky>
		<!-- 几号 -->
		<view class="u-flex wrap u-p-x-19 yuansu">
			<view class="u-text-center u-m-t-24 hao " :class="item.choose?'haoAct':''" v-for="(item,i) in list" :key="i">
				<view>{{item.name}}</view>
				<view v-if="item.choose" class="u-p-t-10">{{item.hour}}hr</view>
			</view>
		</view>


		<lawTabbar :current='2'></lawTabbar>
	</view>
</template>

<script>
	import {
		lsLawyerTimeMonth
	} from "@/api/index/index.js"
	import lawTabbar from '@/components/lawTabbar.vue'
	export default {
		components: {
			lawTabbar
		},
		data() {
			return {
				jinnian: '', // 记录 当前时间年份，不改变
				jinyue: '', // 记录 当前时间月份，不改变

				yuefen: '', // 当前时间  示例 2023-10-01  传值用
				nian: '', // 页面显示用
				yue: '', // 页面显示用
				nianyueri: '', // 现在的 2022-2-12-01
				xianianyueri: '', // 下一个月份 2022-2-12-01
				list: [
					// {choose:true,hour:'4hr',name:1},
				],
				scrollTop: 0
			}
		},
		filters: {
			MonthTrans(val) {
				let result = null
				switch (val) {
					case 1:
						return (result = 'January')
						break
					case 2:
						return (result = 'February')
						break
					case 3:
						return (result = 'March')
						break
					case 4:
						return (result = 'April')
						break
					case 5:
						return (result = 'May')
						break
					case 6:
						return (result = 'June')
						break
					case 7:
						return (result = 'July')
						break
					case 8:
						return (result = 'August')
						break
					case 9:
						return (result = 'September')
						break
					case 10:
						return (result = 'October')
						break
					case 11:
						return (result = 'November')
						break
					case 12:
						return (result = 'December')
						break
				}
				return result
			},

		},
		onShow() {
			this.list = [];
			this.getdate();
		},
		onLoad(option) {
			// this.getwidth();
			// yuansu 监听某个div 到达顶部
		},
		// mounted(){
		//  window.addEventListener('scroll',this.handleScrollx,true)
		// },
		// // 需要在页面销毁时，移除监听事件，避免了内存泄漏
		// beforeDestroy() {
		// 		window.removeEventListener("scroll",this.handleScrollx);
		// },
		methods: {
			// handleScrollx() {
			// 	// console.log(this.list.length)
			//   console.log('滚动高度',window.pageYOffset);
			//  },
			// 获取当前  年与月份
			getdate() {
				let that = this;
				var today = new Date();
				var year = today.getFullYear();
				var month = today.getMonth() + 1;
				var jinday = today.getDate();

				this.jinnian = year;
				this.jinyue = month;

				// 获取每月是多少天
				var day = new Date(year, month, 0).getDate();

				console.log(month + '月有' + day + '天');

				// 本月
				for (var i = 0; i < day; i++) {
					this.list.push({
						choose: false, // 是否选中
						hour: 0, // 总共多长时间
						name: i + 1, // 日
						month: month, // 月
						nian: year, // 年
						riqi: year + '-' + month + '-' + (Number(i + 1) < 10 ? '0' + Number(i + 1) : Number(i +
							1)) // 日期 2023-11-18
					});
				}


				// 获取每月1号是 周几
				let one = month + '/1' + '/' + year; //   10/1/2023
				// var weekArr = ['星期天','星期一', '星期二', '星期三', '星期四', '星期五', '星期六'];
				var weekArr = ['0', '1', '2', '3', '4', '5', '6'];
				var week = weekArr[new Date(one).getDay()];
				console.log(month + '月1号是周' + week);

				let arr = []
				if (week == 2) {
					arr = [{
						name: ''
					}]
				} else if (week == 3) {
					arr = [{
						name: ''
					}, {
						name: ''
					}]
				} else if (week == 4) {
					arr = [{
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}]
				} else if (week == 5) {
					arr = [{
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}]
				} else if (week == 6) {
					arr = [{
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}]
				} else if (week == 0) {
					arr = [{
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}, {
						name: ''
					}]
				}

				this.list = arr.concat(this.list);

				this.yuefen = year + '-' + month + '-01';
				this.nianyueri = year + '-' + month + '-' + jinday;
			
				this.nian = year;
				this.yue = month;


				uni.showLoading({
					title:'Loading'
				});
				

				this.getlist();
				setTimeout(function() {
					that.jiaFun();
				}, 300);
			},
			jiaFun() {
				// 月份加1
				var date2 = new Date(this.nianyueri);
				date2.setMonth(date2.getMonth() + 1);
				this.xianianyueri = this.DateToString(date2, 'yyyy-MM-dd')
				// console.log(this.xianianyueri ,'下一个月');

				var today1 = new Date(this.xianianyueri);
				var year1 = today1.getFullYear();
				var month1 = today1.getMonth() + 1;
				var jinday1 = today1.getDate();
				// 获取下一个月每月是几天
				var day1 = new Date(year1, month1, 0).getDate();
				console.log(this.xianianyueri + '有多少天' + day1)

				for (var i = 0; i < day1; i++) {
					this.list.push({
						choose: false, // 是否选中
						hour: 0, // 总共多长时间
						name: i + 1, // 日
						month: month1, // 月
						nian: year1, // 年
						riqi: year1 + '-' + month1 + '-' + (Number(i + 1) < 10 ? '0' + Number(i + 1) : Number(i +
							1)) // 日期 2023-11-18
					});
				}

				console.log(this.list, '所有')
				
				this.yuefen = this.xianianyueri;
				this.getlist();
			},
			// 月份 加1 
			DateToString(date, fmt) {
				var o = {
					'Q+': Math.floor((date.getMonth() + 3) / 3), // 季度
					'M+': date.getMonth() + 1, // 月份
					'd+': date.getDate(), // 日
					'h+': (date.getHours() % 24 == 0) ? '00' : date.getHours() % 24, // 小时
					'H+': date.getHours(), // 小时
					'm+': date.getMinutes(), // 分
					's+': date.getSeconds(), // 秒
					'f+': date.getMilliseconds() // 毫秒
				};
				var week = {
					'0': '/u65e5',
					'1': '/u4e00',
					'2': '/u4e8c',
					'3': '/u4e09',
					'4': '/u56db',
					'5': '/u4e94',
					'6': '/u516d'
				};
				if (/(y+)/.test(fmt))
					fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
				if (/(E+)/.test(fmt))
					fmt = fmt.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? '/u661f/u671f' : '/u5468') :
						'') + week[date.getDay() + '']);
				for (var k in o) {
					if (k == 'f+') {
						if (new RegExp('(' + k + ')').test(fmt)) {
							var regExp0 = '000000000' + o[k];
							fmt = fmt.replace(RegExp.$1, regExp0.substr(regExp0.length - RegExp.$1.length));
						}
					} else {
						if (new RegExp('(' + k + ')').test(fmt))
							fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (('00' + o[k]).substr(('' + o[k])
								.length)));
					}
				}
				return fmt;
			},

			getlist() {
			
				let data = {
					yuefen: this.yuefen,
					lawyerId: uni.getStorageSync('lawyerId')
				}
				lsLawyerTimeMonth(data).then(res => {
					uni.hideLoading();
					res.rows.forEach(item => {
						this.list.forEach(itemdata => {
							if (item.riqi == itemdata.riqi) {
								itemdata.choose = true;
								itemdata.hour = item.zongTime;
							}
						});
					});

				});
			}

		},

		//监听页面滚动
		onPageScroll(res) {
			let that = this;
			let a = 0
			a = res.scrollTop / 300;
			a = parseInt(a);
			if (a == 0) {
				that.nian = this.jinnian;
				that.yue = this.jinyue;
			} else {
				that.list.forEach((item, i) => {
					if (i / 29 == a + 1) {
						that.nian = item.nian;
						that.yue = item.month;
					}
				});
			}
		},

		// 触底加载
		onReachBottom() {
			console.log('触底加载', this.yue, this.nian);
			console.log('现在的月份', this.yuefen);

			var date = new Date(this.yuefen);
			date.setMonth(date.getMonth() + 1);
			this.yuefen = this.DateToString(date, 'yyyy-MM-dd');

			var today1 = new Date(this.yuefen);
			var year1 = today1.getFullYear();
			var month1 = today1.getMonth() + 1;
			var jinday1 = today1.getDate();

			// 获取下一个月每月是几天
			var day1 = new Date(year1, month1, 0).getDate();
			console.log(this.yuefen + '有多少天' + day1)


			for (var i = 0; i < day1; i++) {
				this.list.push({
					choose: false, // 是否选中
					hour: 0, // 总共多长时间
					name: i + 1, // 日
					month: month1, // 月
					nian: year1, // 年
					riqi: year1 + '-' + month1 + '-' + (Number(i + 1) < 10 ? '0' + Number(i + 1) : Number(i +
						1)) // 日期 2023-11-18
				});
			}

	

			this.nian = year1;
			this.yue = month1;

			this.getlist();

		},
		// onPullDownRefresh() {
		// 	this.pageNum = 1;
		// 	this.getlist();
		// 	setTimeout(function() {
		// 		uni.stopPullDownRefresh();
		// 	}, 1000);
		// }

	}
</script>

<style lang='scss' scoped>
	.bianji {
		width: 120rpx;
		height: 56rpx;
		border-radius: 28rpx;
		border: 2rpx solid #FFFFFF;
		font-size: 30rpx;
		font-family: Helvetica-Bold, Helvetica;
		font-weight: bold;
		line-height: 56rpx;
		text-align: center;
		cursor: pointer;
	}

	/* 
	750 - 48 / 7 == 100 
	2200 - 48 / 7 == 307
	*/
	.riqi {
		background: #F7F7F7;
		font-size: 30rpx;
		font-family: Helvetica;
		padding: 30rpx 0;

		view {
			cursor: pointer;
			width: 100rpx;
			text-align: center;
		}
	}

	.hao {
		font-size: 30rpx;
		font-family: Helvetica;
		padding-top: 16rpx;
		height: 124rpx;
		border-radius: 8rpx;
		width: 96rpx;
		box-sizing: border-box;
		margin: 0 3rpx;
	}

	.haoAct {
		background: #E5F7FF;
		color: #0078B2;
		font-family: Helvetica-Bold, Helvetica;
		font-weight: bold;
	}

	@media only screen and (min-width: 750px) {
		.riqi {
			view {
				width: 307rpx;
			}
		}

		.hao {
			width: 302rpx;
		}
	}
</style>```