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ajax实现下拉刷新+上拉加载

2020-06-06 分类：前端 阅读(804) 评论(0)

上面动图是实现的效果。

全程无需重新加载整个页面，只需要上下拉即可刷新数据！

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>上拉加载</title>
    <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"/>

    <script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
            list-style: none;
            box-sizing: border-box;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
        }
        html {font-size: 14px; }
        header {
            height: 40px;
            width: 100%;
            min-width: 320px;
            background: #000;
            text-align: center;
            color: #fff;
            font-size: 1.2rem;
            line-height: 40px;
        }
        footer {
            height: 52px;
            width: 100%;
            min-width: 320px;
            background: #000;
            text-align: center;
            color: #fff;
            font-size: 1.2rem;
            line-height: 52px;
            position: absolute;
            bottom: 0;
        }
        #wrapper {
            width: 100%;
            min-width: 320px;
            position: absolute;
            left: 0;
            top: 40px;
            bottom: 52px;
            overflow: hidden;
            z-index: 1;
            background-color: #eee;

            /* 防止本机Windows上的触摸事件 */
            -ms-touch-action: none;

            /* 防止callout tap-hold和文本的选择 */
            -webkit-touch-callout: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;

            /* 防止文本调整取向变化对web应用程序很有用 */
            -webkit-text-size-adjust: none;
            -moz-text-size-adjust: none;
            -ms-text-size-adjust: none;
            -o-text-size-adjust: none;
            text-size-adjust: none;
        }
        .pull-loading {
            text-align: center;
            height: 40px;
            line-height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        #scroller ul li {
            padding: 20px 10px;
            border-bottom: solid 1px #ccc;
            background: #fff;
        }
    </style>

</head>
<body>
<header>上拉加载，下拉刷新</header>
<div id="wrapper">
    <div id="scroller">
        <ul>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
        </ul>
        <div class="pull-loading">
            上拉加载
        </div>
    </div>
</div>
<footer>底部</footer>

<script type="text/javascript" src="js/iscroll.js"></script>
<script type="text/javascript">
    var myscroll = new iScroll("wrapper", {
        onScrollMove: function () { //拉动时
            //上拉加载
            if (this.y < this.maxScrollY) {
                $(".pull-loading").html("释放加载");
                $(".pull-loading").addClass("loading");
            } else {
                $(".pull-loading").html("上拉加载");
                $(".pull-loading").removeClass("loading");
            }
        },
        onScrollEnd: function () { //拉动结束时
            //上拉加载
            if ($(".pull-loading").hasClass('loading')) {
                $(".pull-loading").html("加载中...");
                pullOnLoad();
            }
        }
    });

    //上拉加载函数,ajax
    var num = 0;
    var page = 4; //每次加载4条
    function pullOnLoad() {
        setTimeout(function () {
            $.ajax({
                url: "json/data.json",
                type: "get",
                dataType: 'json',
                success: function (data) {
                    var data_length = data.length;//数据的总长度
                    var remainder = data_length % page;//余数
                    if ( data_length >= (num+page)){
                        for (var j = num; j < num + page; j++){
                            var text = data[j].text;
                            $("#scroller ul").append("<li>"+ text +"</li>");
                        }
                        num+=page;
                    }else if (remainder != 0 && data_length-num == remainder){
                        for (var j = num; j < num + remainder; j++){
                            var text = data[j].text;
                            $("#scroller ul").append("<li>"+ text +"</li>");
                        }
                        num+=page;
                    }else{
                        $('.pull-loading').html("没有了哟");
                    }
                    myscroll.refresh();
                },
                error: function () {
                    console.log("出错了");
                }
            });
            myscroll.refresh();
        }, 500);
    }
</script>

</body>
</html>

data.json

[
  {
    "text":"十年编程两茫茫，工期短，需求长。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"千行代码，Bug何处藏。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"纵使上线又如何，新版本，继续忙。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"黑白颠倒没商量，睡地铺，吃食堂。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"夜半梦醒，无人在身旁。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"最怕灯火阑珊时，手机响，心里慌。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"是，程序员设计了程序",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"还是，程序造就了程序员？",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"程序，程序员——你的名字，我的姓氏",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"日撸代码三千行，疯狂、疯狂，人未老，珠已黄。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"少年投身IT行，老来无伴又何妨。擦肩美女不屑看，三千码友在身旁。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"老夫聊发少年狂，不小心，选错行。误入IT，两眼泪茫茫",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"夜半话凄凉，转眼泪千行，日日工期紧，亦为重构忙。久易无定论，命悬需求方，四顾前途路，一步三踉跄。",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"IT放两旁，闲来把码敲，余音仍绕梁。码农压力大，愿君更健康！",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"22222",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"33333",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"4444",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"55555",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"66666",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"7777",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"88888",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"99999",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"1010101010",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"1.1.1.1.1.1.1.1.1.1.",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"12121212121212",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"1131313133131",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"1414141414",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"1515151515151",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  },
  {
    "text":"111111111111",
    "date":"2018-02-02 14:00"
  }

]

需要引入两个js文件
jquery-2.2.4.min.js
iscroll.js

整体代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>上拉加载</title>
    <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"/>

    <script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
            list-style: none;
            box-sizing: border-box;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
        }
        html {font-size: 14px; }
        header {
            height: 40px;
            width: 100%;
            min-width: 320px;
            background: #000;
            text-align: center;
            color: #fff;
            font-size: 1.2rem;
            line-height: 40px;
        }
        footer {
            height: 52px;
            width: 100%;
            min-width: 320px;
            background: #000;
            text-align: center;
            color: #fff;
            font-size: 1.2rem;
            line-height: 52px;
            position: absolute;
            bottom: 0;
        }
        #wrapper {
            width: 100%;
            min-width: 320px;
            position: absolute;
            left: 0;
            top: 40px;
            bottom: 52px;
            overflow: hidden;
            z-index: 1;
            background-color: #eee;

            /* 防止本机Windows上的触摸事件 */
            -ms-touch-action: none;

            /* 防止callout tap-hold和文本的选择 */
            -webkit-touch-callout: none;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;

            /* 防止文本调整取向变化对web应用程序很有用 */
            -webkit-text-size-adjust: none;
            -moz-text-size-adjust: none;
            -ms-text-size-adjust: none;
            -o-text-size-adjust: none;
            text-size-adjust: none;
        }
        .pull-loading {
            text-align: center;
            height: 40px;
            line-height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        #scroller ul li {
            padding: 20px 10px;
            border-bottom: solid 1px #ccc;
            background: #fff;
        }
    </style>

</head>
<body>
<header>上拉加载，下拉刷新</header>
<div id="wrapper">
    <div id="scroller">
        <ul>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
            <li>这里显示部分数据</li>
        </ul>
        <div class="pull-loading">
            上拉加载
        </div>
    </div>
</div>
<footer>底部</footer>

<script type="text/javascript" src="js/iscroll.js"></script>
<script type="text/javascript">
    var myscroll = new iScroll("wrapper", {
        onScrollMove: function () { //拉动时
            //上拉加载
            if (this.y < this.maxScrollY) {
                $(".pull-loading").html("释放加载");
                $(".pull-loading").addClass("loading");
            } else {
                $(".pull-loading").html("上拉加载");
                $(".pull-loading").removeClass("loading");
            }
        },
        onScrollEnd: function () { //拉动结束时
            //上拉加载
            if ($(".pull-loading").hasClass('loading')) {
                $(".pull-loading").html("加载中...");
                pullOnLoad();
            }
        }
    });

    //上拉加载函数,ajax
    var num = 0;
    var page = 4; //每次加载4条
    function pullOnLoad() {
        setTimeout(function () {
            $.ajax({
                url: "json/data.json",
                type: "get",
                dataType: 'json',
                success: function (data) {
                    var data_length = data.length;//数据的总长度
                    var remainder = data_length % page;//余数
                    if ( data_length >= (num+page)){
                        for (var j = num; j < num + page; j++){
                            var text = data[j].text;
                            $("#scroller ul").append("<li>"+ text +"</li>");
                        }
                        num+=page;
                    }else if (remainder != 0 && data_length-num == remainder){
                        for (var j = num; j < num + remainder; j++){
                            var text = data[j].text;
                            $("#scroller ul").append("<li>"+ text +"</li>");
                        }
                        num+=page;
                    }else{
                        $('.pull-loading').html("没有了哟");
                    }
                    myscroll.refresh();
                },
                error: function () {
                    console.log("出错了");
                }
            });
            myscroll.refresh();
        }, 500);
    }
</script>

</body>
</html>

来源：https://segmentfault.com/a/1190000015086218

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