这篇文章主要为大家展示了“基于vue2如何实现上拉加载功能”,内容简而易懂,条理清晰,希望能够帮助大家解决疑惑,下面让小编带领大家一起研究并学习一下“基于vue2如何实现上拉加载功能”这篇文章吧。
具体内容如下
因为我们项目中,还用了swiper。很多都是滑动切换的,但是又得上拉加载,所以导致,很多UI框架,我们用了,都有不同的bug出现,没办法,最后写了一个。代码如下(这个因为很多地方会用,所以建议放在components/common下面):
<template> <div class="loadmore"> <slot></slot> <slot name="bottom"> </slot> </div> </template> <style> .loadmore{ width:100%; } </style> <script> export default { name: 'loadmore', props: { maxDistance: { type: Number, default: 0 }, autoFill: { type: Boolean, default: true }, distanceIndex: { type: Number, default: 2 }, bottomPullText: { type: String, default: '上拉刷新' }, bottomDropText: { type: String, default: '释放更新' }, bottomLoadingText: { type: String, default: '加载中...' }, bottomDistance: { type: Number, default: 70 }, bottomMethod: { type: Function }, bottomAllLoaded: { type: Boolean, default: false }, }, data() { return { // 最下面出现的div的位移 translate: 0, // 选择滚动事件的监听对象 scrollEventTarget: null, containerFilled: false, bottomText: '', // class类名 bottomDropped: false, // 获取监听滚动元素的scrollTop bottomReached: false, // 滑动的方向 down---向下互动;up---向上滑动 direction: '', startY: 0, startScrollTop: 0, // 实时的clientY位置 currentY: 0, topStatus: '', // 上拉加载的状态 '' pull: 上拉中 bottomStatus: '', }; }, watch: { // 改变当前加载在状态 bottomStatus(val) { this.$emit('bottom-status-change', val); switch (val) { case 'pull': this.bottomText = this.bottomPullText; break; case 'drop': this.bottomText = this.bottomDropText; break; case 'loading': this.bottomText = this.bottomLoadingText; break; } } }, methods: { onBottomLoaded() { this.bottomStatus = 'pull'; this.bottomDropped = false; this.$nextTick(() => { if (this.scrollEventTarget === window) { document.body.scrollTop += 50; } else { this.scrollEventTarget.scrollTop += 50; } this.translate = 0; }); // 注释 if (!this.bottomAllLoaded && !this.containerFilled) { this.fillContainer(); } }, getScrollEventTarget(element) { let currentNode = element; while (currentNode && currentNode.tagName !== 'HTML' && currentNode.tagName !== 'BODY' && currentNode.nodeType === 1) { let overflowY = document.defaultView.getComputedStyle(currentNode).overflowY; if (overflowY === 'scroll' || overflowY === 'auto') { return currentNode; } currentNode = currentNode.parentNode; } return window; }, // 获取scrollTop getScrollTop(element) { if (element === window) { return Math.max(window.pageYOffset || 0, document.documentElement.scrollTop); } else { return element.scrollTop; } }, bindTouchEvents() { this.$el.addEventListener('touchstart', this.handleTouchStart); this.$el.addEventListener('touchmove', this.handleTouchMove); this.$el.addEventListener('touchend', this.handleTouchEnd); }, init() { this.bottomStatus = 'pull'; // 选择滚动事件的监听对象 this.scrollEventTarget = this.getScrollEventTarget(this.$el); if (typeof this.bottomMethod === 'function') { // autoFill 属性的实现 注释 this.fillContainer(); // 绑定滑动事件 this.bindTouchEvents(); } }, // autoFill 属性的实现 注释 fillContainer() { if (this.autoFill) { this.$nextTick(() => { if (this.scrollEventTarget === window) { this.containerFilled = this.$el.getBoundingClientRect().bottom >= document.documentElement.getBoundingClientRect().bottom; } else { this.containerFilled = this.$el.getBoundingClientRect().bottom >= this.scrollEventTarget.getBoundingClientRect().bottom; } if (!this.containerFilled) { this.bottomStatus = 'loading'; this.bottomMethod(); } }); } }, // 获取监听滚动元素的scrollTop checkBottomReached() { if (this.scrollEventTarget === window) { return document.body.scrollTop + document.documentElement.clientHeight >= document.body.scrollHeight; } else { // getBoundingClientRect用于获得页面中某个元素的左,上,右和下分别相对浏览器视窗的位置。 right是指元素右边界距窗口最左边的距离,bottom是指元素下边界距窗口最上面的距离。 return this.$el.getBoundingClientRect().bottom <= this.scrollEventTarget.getBoundingClientRect().bottom + 1; } }, // ontouchstart 事件 handleTouchStart(event) { // 获取起点的y坐标 this.startY = event.touches[0].clientY; this.startScrollTop = this.getScrollTop(this.scrollEventTarget); this.bottomReached = false; if (this.bottomStatus !== 'loading') { this.bottomStatus = 'pull'; this.bottomDropped = false; } }, // ontouchmove事件 handleTouchMove(event) { if (this.startY < this.$el.getBoundingClientRect().top && this.startY > this.$el.getBoundingClientRect().bottom) { // 没有在需要滚动的范围内滚动,不再监听scroll return; } // 实时的clientY位置 this.currentY = event.touches[0].clientY; // distance 移动位置和开始位置的差值 distanceIndex--- let distance = (this.currentY - this.startY) / this.distanceIndex; // 根据 distance 判断滑动的方向 并赋予变量 direction down---向下互动;up---向上滑动 this.direction = distance > 0 ? 'down' : 'up'; if (this.direction === 'up') { // 获取监听滚动元素的scrollTop this.bottomReached = this.bottomReached || this.checkBottomReached(); } if (typeof this.bottomMethod === 'function' && this.direction === 'up' && this.bottomReached && this.bottomStatus !== 'loading' && !this.bottomAllLoaded) { // 有加载函数,是向上拉,有滚动距离,不是正在加载ajax,没有加载到最后一页 event.preventDefault(); event.stopPropagation(); if (this.maxDistance > 0) { this.translate = Math.abs(distance) <= this.maxDistance ? this.getScrollTop(this.scrollEventTarget) - this.startScrollTop + distance : this.translate; } else { this.translate = this.getScrollTop(this.scrollEventTarget) - this.startScrollTop + distance; } if (this.translate > 0) { this.translate = 0; } this.bottomStatus = -this.translate >= this.bottomDistance ? 'drop' : 'pull'; } }, // ontouchend事件 handleTouchEnd() { if (this.direction === 'up' && this.bottomReached && this.translate < 0) { this.bottomDropped = true; this.bottomReached = false; if (this.bottomStatus === 'drop') { this.translate = '-50'; this.bottomStatus = 'loading'; this.bottomMethod(); } else { this.translate = '0'; this.bottomStatus = 'pull'; } } this.direction = ''; } }, mounted() { this.init(); } }; </script>
然后哪个页面需要,在哪个页面导入即可:import LoadMore from './../common/loadmore.vue';在需要引入他的页面写法如下:
<template> <section class="finan"> <!-- 上拉加载更多 --> <load-more :bottom-method="loadBottom" :bottom-all-loaded="allLoaded" :bottomPullText='bottomText' :auto-fill="false" @bottom-status-change="handleBottomChange" ref="loadmore"> <div> 这里写你需要的另外的模块 </div> <div v-show="loading" slot="bottom" class="loading"> 这个div是为让上拉加载的时候显示一张加载的gif图 <img src="./../../assets/main/uploading.gif"> </div> </load-more> </section> </template>
然后在此页面的data里和methods设置如下:
export default { name: 'FinancialGroup', props:{ }, data () { return { // 上拉加载数据 scrollHeight: 0, scrollTop: 0, containerHeight: 0, loading: false, allLoaded: false, bottomText: '上拉加载更多...', bottomStatus: '', pageNo: 1, totalCount: '', } }, methods: { /* 下拉加载 */ _scroll: function(ev) { ev = ev || event; this.scrollHeight = this.$refs.innerScroll.scrollHeight; this.scrollTop = this.$refs.innerScroll.scrollTop; this.containerHeight = this.$refs.innerScroll.offsetHeight; }, loadBottom: function() { this.loading = true; this.pageNo += 1; // 每次更迭加载的页数 if (this.pageNo == this.totalGetCount) { // 当allLoaded = true时上拉加载停止 this.loading = false; this.allLoaded = true; } api.commonApi(后台接口,请求参数) 这个api是封装的axios有不懂的可以看vue2+vuex+axios那篇文章 .then(res => { setTimeout(() => { 要使用的后台返回的数据写在setTimeout里面 this.$nextTick(() => { this.loading = false; }) }, 1000) }); }, handleBottomChange(status) { this.bottomStatus = status; }, }
这样就完成了。
以上是“基于vue2如何实现上拉加载功能”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注亿速云行业资讯频道!
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。