js 前端实现下拉刷新 上拉加载
阅读原文时间:2023年07月09日阅读:2

效果


css

html,body{
height:100%;  // 其他界面未设置html  无法监听scroll
}
 /*  下拉刷新  */
        .refresh-loading {
            transition: all 300ms ease 0s;
            height: 0;
            padding-top: 10px;
            overflow: hidden;
        }

        .type-1 .con,
        .refresh-loading .g-m--c {
            width: 16px;
            height: 16px;
            border-radius: 50%;
            -webkit-animation-name: locate-loading;
            -moz-animation-name: locate-loading;
            animation-name: locate-loading;
            -webkit-animation-duration: 1.58s;
            -moz-animation-duration: 1.58s;
            animation-duration: 1.58s;
            -webkit-animation-timing-function: linear;
            -moz-animation-timing-function: linear;
            animation-timing-function: linear;
            -webkit-animation-iteration-count: infinite;
            -moz-animation-iteration-count: infinite;
            animation-iteration-count: infinite;
            border-top: 2px solid #f43939;
            border-left: 2px solid #df5555;
            margin: auto;
        }

        @keyframes locate-loading {
            0% {
                opacity: 1;
                -webkit-transform: rotate(0deg);
                -moz-transform: rotate(0deg);
                transform: rotate(0deg);
            }
            100% {
                opacity: 1;
                -webkit-transform: rotate(360deg);
                -moz-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }

        @-webkit-keyframes locate-loading {
            0% {
                opacity: 1;
                -webkit-transform: rotate(0deg);
                -moz-transform: rotate(0deg);
                transform: rotate(0deg);
            }
            100% {
                opacity: 1;
                -webkit-transform: rotate(360deg);
                -moz-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }

        @-moz-keyframes locate-loading {
            0% {
                opacity: 1;
                -webkit-transform: rotate(0deg);
                -moz-transform: rotate(0deg);
                transform: rotate(0deg);
            }
            100% {
                opacity: 1;
                -webkit-transform: rotate(360deg);
                -moz-transform: rotate(360deg);
                transform: rotate(360deg);
            }
        }

        .refresh-txt {
            color: #999;
            text-align: center;
            font-size: 12px;
        }
 /*  上拉加载  */
        .more-c {
            font-size: 12px;
        }

        .more-c .con {
            margin: 0 5px 0 0;
        }

        .more-c .type {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .type-1:after {
            content: '加载中...';
            display: inline-block
        }

html

<!-- 不设置高度,在执行滚动时,监听不到div上有scroll事件 -->
<!--  height: 100%;设置高度,不然会监听不到scroll  -->
<body style="background-color: #FFFFFF;height: 100%;">
<div class="app_header"></div>
<!--  height: 100%;overflow: auto;设置高度,不然会监听不到scroll  -->
<div class="warper" style="padding-top: 120px;overflow: auto;width: 100%;height: 100%;">
<!--  下拉刷新  -->
    <div class="refresh-loading" >
        <div class="g-m--c"></div>
        <p class="refresh-txt">下拉可刷新</p>
    </div>
<!--  下拉刷新  -->
    <!-- 数据渲染容器 -->
    <div id="result" class="scroll"></div>

    <!-- 数据渲染模板 -->

    <!--  上拉加载  -->
    <div class="more-c">
        <div id="loadMore" class="type">
            <div class="con"></div>
        </div>
    </div>
   <!--  上拉加载  -->
</div>

JavaScript

    var page = 1;//页面显示页码
    var quantity = 10;//每页显示总数
    var isPullUpLoad = false;//是否为上拉加载
    var isPullDownRefresh = true;//下拉刷新
 /** 下拉刷新/上拉加载  开始 **/
    var moveEle = document.getElementsByClassName('warper')[0]; //内容容器,可视区域
    var scrollView = document.getElementsByClassName('scroll')[0]; //真正的内容
    var refreshEle = document.getElementsByClassName('refresh-loading')[0]; //刷新的loading
    var refreshTxtEle = document.getElementsByClassName('refresh-txt')[0]; //刷新显示的提示文字
    var touch, moved, startY, diff, moveDiff = 60;  // 设置一个移动距离
// 可视区域监听触摸开始
 moveEle.addEventListener('touchstart', function (e) {
        // fyappapi.toastInfo(moveEle.scrollTop);
        if (moveEle.scrollTop > 0) {
            //当页面已经有滚动或者不是置顶的时候,不需要进行下拉刷新,是页面正常的滑动
            touch = false;
            return;
        }
        touch = true; //触摸开始
        moved = false; //还没有进行下拉刷新的滑动
        startY = e.touches[0].clientY; //记录当前手指在屏幕上的纵向坐标,用于判断页面是上滑还是下滑
    }, false);
// 可视区域监听移动
    moveEle.addEventListener('touchmove', function (e) {
        if (!touch || !isPullDownRefresh) {
            return;
        }
        var touchesDiff = e.touches[0].clientY - startY; //计算的移动位移
        if (touchesDiff < 0) {
            //说明页面是向上滑的,不做任何操作
            moved = false;
            return;
        }
        moved = true;
        diff = touchesDiff;
        var distance = 0;
        if (diff <= moveDiff) {
            //moveDiff至少要等于loading的高度
            //当滑动小于规定的临界值时
            distance = diff;
            refreshTxtEle.innerHTML = '下拉可刷新';
        } else {
            refreshTxtEle.innerHTML = '释放可刷新';
            //弹性
            if (touchesDiff <= (2 * moveDiff)) {
                distance = moveDiff + 0.5 * (touchesDiff - moveDiff);
            } else {
                distance = moveDiff + 0.1 * (touchesDiff - moveDiff) + 0.05 * (touchesDiff - 2 * moveDiff);
            }
        }
        if (distance > 0) {
            //滑动的距离
            css(refreshEle, 0);
            refreshEle.style.height = distance + 'px';
        }
        generatedCount = 0; //下拉刷新的时候清空上拉加载更多的次数统计
    }, false);
// 可视区域监听触摸完成
    moveEle.addEventListener('touchend', function (e) {
        if (!touch || !moved) {
            refreshEle.style.height = '0px';
            return;
        }
        css(refreshEle, 300);
        isPullDownRefresh = false;
        if (diff > moveDiff) {
            refreshTxtEle.innerHTML = '刷新中';
            refreshEle.style.height = moveDiff + 'px';

            setTimeout(() => {
                // fyappapi.toastInfo('下拉刷新');
                //延迟模拟接口调用
                css(refreshEle, 300);
                    page = 1;
                    quantity = 100;
                    if(type == 0){ // 店铺
                        getdata();
                    }else{
                        getcangku(); // 仓库
                    }
                refreshEle.style.height = '0px';
                setTimeout(() => {
                    isPullDownRefresh = true; //控制在刷新期间,重复向下拉动,不做任何操作
                }, 300);
            }, 500);
        } else {
            isPullDownRefresh = true;
            refreshEle.style.height = '0px';
        }
    }, false);

function css(ele, t) {
        ele.style.transition = "all " + t + "ms";
        ele.style.webkitTransition = "all " + t + "ms";
    }

//上拉加载 开始
    var loadMore = document.getElementById('loadMore');
    var className = loadMore.getAttribute('class');
    // fyappapi.toastInfo(scrollView.offsetHeight);
    //上拉加载 监听scroll 若未设置
    moveEle.addEventListener('scroll', function (e) {
        requestAnimationFrame(function () {
            //当数据正在加载时,直接返回
            if (isPullUpLoad) {
                return;
            }
            var contentHeight = scrollView.offsetHeight; //1500
            //滚动的距离,加上可视窗口的高度,因为设置了content的max-height为300px
            var scrollTop = moveEle.scrollTop + 300; //开始325.5 最后 1124
            // alert(scrollTop);
            // 原这里减掉30,可能因为布局不同,我需要减到400才能触发
            if (contentHeight && scrollTop > contentHeight - 400) {
                //当滚动距离内容底部30px的时候,拉取下一页数据
                //html5提供的classList
                loadMore.classList.add('type-1');
                isPullUpLoad = true;
                setTimeout(() => {
                    //接口调用
                    loadMore.classList.remove('type-1');
                    // fyappapi.toastInfo('接口调用');
                    page ++ ;
                    if(type == 0){ // 店铺
                        getdata();
                    }else{
                        getcangku(); // 仓库
                    }
                }, 300);
            }

        });
    }, false);
    /** 下拉刷新/上拉加载 完 **/

// 接口获取数据渲染界面  根据 isPullUpLoad 判断
 if (data.status == 1) {
            var template = $.templates("#theTmpl");
            var htmlOutput = template.render(data.result);
            if (isPullUpLoad != true) {
                $("#result").html(htmlOutput);
            } else {
                isPullUpLoad = false;
                $("#result").append(htmlOutput);
            }

        } else {
            if (isPullUpLoad == true) {
                isPullUpLoad = false;
                page--;
                fyappapi.toastInfo("没有更多数据了!");
            } else {
                $("#result").html(`<div style="display: flex;flex-direction: column;justify-content: center;align-items: center;margin-top: 40%;">
                    <img style="width: 50%;height: 50%;" src="__PUBLIC__/img/nono_data.png" />
                    <span style="margin-top: 30px;font-size: 20px;color: #666666;">暂无数据</span>
                    </div>`);
            }
        }

道路还是很遥远 很感恩发布共享的大佬们,我花了三天时间才解决各种问题