vue 实现上拉加载下拉刷新（思路贼清晰）

2018年05月08日 17:13:21阅读数：1565项目需要用到上拉刷新下拉加载所以自己手动实现了一个组件：<template><div class="my-scroll" ref="myScroll" @touchstart="touchStart($event)" @touchmove

syaka007

4293人浏览 · 2018-07-10 16:45:10

syaka007 · 2018-07-10 16:45:10 发布

2018年05月08日 17:13:21

阅读数：1565

项目需要用到上拉刷新下拉加载所以自己手动实现了一个
组件：

<template>
    <div class="my-scroll" ref="myScroll" @touchstart="touchStart($event)" @touchmove="touchMove($event)" @touchend="touchEnd($event)">
        <div class="scroll-top" :style="{height:top+'px'}">
            <div v-if="aspect==2">
                <p v-if="state==6">
                    下拉刷新
                </p>
                <p v-if="state==1">
                    <i><img :src="Load"/></i>
                    <br/>
                    刷新中
                </p>
                <p v-if="state==2">松开刷新</p>
                <p v-if="state==3">
                    <i><img :src="Load"/></i>
                    <br/>
                    刷新完成
                </p>
            </div>
        </div>
        <!-- top -->
        <div class="scroll-list" :style="{ transform: 'translate3d(0, ' + top + 'px, 0)'}">
            <slot name='scrollList'></slot>
            <div class="scroll-bottom">
                <div v-if="state==4">加载中</div>
                <div v-if="state==5">加载完成</div>
                <div v-if="state==7">没有更多</div>
            </div>
        </div>
    </div>
</template>
<script type="text/javascript">
import Load from '../assets/Load.gif'
    export default {
        name:'myScroll',
        props:{
            'page':{
                type:Object,  //counter:当前页  pageStart:开始页数  pageEnd:结束页数  total:总页数
                require:true,
            },
            'onRefresh':{ //刷新回调
                type:Function,
                require:true
            },
            'onPull':{ //加载回调
                type:Function,
                require:true
            },
            'getScrollTop':{ //获取滚动条位置
                type:Function
            },
            'setScrollPage':{ //改变滚动条位置
                type:Function
            },
        },
        data(){
            return {
                Load,
                pageX:0,
                pageY:0,
                state:0, 
                scrollPosition:0,
                myScroll:null,
                myScrollList:null,
                top:0,
                aspect:0, //1:向下 2:向上
                listHeight:0,
            }
        },
        created(){
            this.$root.$on('setState', (index) => { //修改状态
                this.state = index
                if(index == 5||index == 3){
                    setTimeout(()=>{
                        this.state = 0
                        this.top = 0
                    },300)
                }
            })
            this.$root.$on('ScrollTop',(top)=>{ //修改滚动条位置
                this.myScroll.scrollTop = top
            })
        },
        methods:{
            touchStart(e){ //触摸事件
                this.pageX = e.targetTouches[0].pageX
                this.pageY = e.targetTouches[0].pageY
            },
            touchMove(e){ //触摸滑动事件
                this.scrollPosition = this.myScroll.scrollTop //获取滚动条位置
                if(e.targetTouches[0].pageY>this.pageY){ //向上滑动
                    this.aspect = 2
                    if(this.myScroll.scrollTop==0){
                        let diff = e.targetTouches[0].pageY - this.pageY - this.scrollPosition
                        this.top = Math.pow(diff, 0.9)
                        let ranget = diff/document.body.clientHeight*100 //计算在屏幕上滑动了多少
                        if(ranget > 20){
                            this.state = 2
                        }else if(ranget < 15){
                            this.state = 6
                        }
                        e.preventDefault()
                    }
                }else if(this.state!=4){ //向上滑动
                    this.aspect = 1
                }

            },
            touchEnd(e){
                if(this.aspect == 2&&this.state == 2||this.state == 1){ //上拉处理
                    this.top = 100
                    this.state = 1
                    this.topCallback()
                }else if(this.aspect == 2){
                    this.state = 0
                    this.top = 0
                }
            },
            topCallback(){ //刷新回调
                this.onRefresh(this.state)
            },
            bottomCallback(){ //加载回调
                this.state = 4
                this.onPull(this.state)
            }
        },
        mounted(){
            this.myScroll = this.$refs.myScroll //获取滑条dom
            this.myScrollList = this.myScroll.children[1] //获取列表dom

            this.myScroll.addEventListener('scroll',(e)=>{ //监听滚动条事件
                let listHeight = this.myScrollList.offsetHeight //列表总高度
                let listScrollTop = e.target.scrollTop + this.myScroll.offsetHeight //当前滚动条位置

                if(this.state == 0&&listHeight-listScrollTop < 100){
                    this.bottomCallback()
                }

                if(this.getScrollTop)this.getScrollTop(e.target.scrollTop) //返回X，Y

            })
        }
    }
</script>
<style lang="scss" scoped>
    .my-scroll{
        color: #fff;
        max-width: 100%;
        max-height: 100%;
        height: 100%;
        overflow:hidden;
        overflow-y: scroll;
        -webkit-overflow-scrolling: touch;
        will-change: transform;
        transition: all 450ms;
        backface-visibility: hidden;
        perspective: 1000;
        position: relative;
        .scroll-top{
            text-align: center;
            display:flex;
            position:absolute;
            top:0;
            left:0;
            width:100%;
            div{
                display:flex;
                height:auto;
                width:100%;
                justify-content: center;
                align-items:center;
                flex-wrap: wrap;
                i{
                    flex:1 0 100%;
                    display:block;
                    height: 0.4rem;
                }
                img{
                    width:0.8rem;
                }
                p{
                    flex:1 0 100%;
                }
            }
        }
        .scroll-list{
            overflow:hidden;
        }
        .scroll-bottom{
            text-align: center;
            line-height: 40px;
        }
    }
</style>

使用：

<template>
    <div class="index">
        <my-scroll :page="page" :on-refresh="onRefresh" :on-pull="onPull">
        <div slot="scrollList">
            <ul>
                <li v-for="(x,index) in list" :key="index">列表</li>
            </ul>
        </div>
        </my-scroll>
    </div>
</template>
<script type="text/javascript">
    import myScroll from '@/components/myScroll.vue'
    export default {
        data(){
            return{
                list:[],
                page:{
                    counter:1,  
                    pageStart:1,  
                    pageEnd:1,  
                    total:10
                },
            }
        },
        methods:{
            onRefresh(mun){ //刷新回调
                    setTimeout(()=>{
                        this.$root.$emit('setState',3)
                    },500)
            },
            onPull(mun){ //加载回调
                if(this.page.counter<=this.page.total){
                    setTimeout(()=>{
                        this.page.counter++
                        this.$root.$emit('setState',5)
                        for(let i=0;i<10;i++){
                            this.listdata.push({})
                        }
                    },500)
                }else{
                    this.$root.$emit('setState',7)
                }
            },

        },
        components:{
            myScroll
        },
        created(){

        },
        mounted(){
            for(let i=0;i<1*50;i++){
                this.list.push({})
            }

        },

    }
</script>
<style lang="scss" scoped>
    .index{

    }
</style>

上拉刷新实现思路：
1.通过touchstart获取用户第一次点击的坐标
2.通过touchmove 判断向上滑动还是向下
4.判断列表的滚动条是否在最顶部
5.然后判断在这个屏幕滑动的比例进行状态显示
下拉加载实现思路：
1.通过判断滚动条位置实现下拉加载

样式：
这里写图片描述

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