以前實現移動端的滑動加載更多實現的方法是當滾動條快到頁面底部時就自動加載更多的數據，在這方面很多人都用的是"西門的后花園"寫的一個叫dropload的插件，這個插件用起來也很好，很感謝西門的后花園作者。我以前在項目中用的也是這個插件，后來我老大說能不能做成那種向上拖動才會加載更多的效果，不要這種滾動到底部就加載，於是我就使用了iscroll。
以下代碼是加入了從數據庫讀取數據並判斷數據全部加載完成的效果（事實是只模擬了從數據庫讀取數據，在使用時可將post請求的url和data換成你自己的就可以了），在本頁的最后附上了模擬的代碼可供下載查看。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>基於zepto的移動端/H5觸摸拖動加載更多數據</title>
<style>
*{margin:0;padding:0;outline:0;-webkit-box-sizing:border-box;box-sizing:border-box;}
body{background:#f1f1f1;color:#666;}
li{list-style-type:none;}
a{text-decoration:none;color:#666;}
.tabsNav{overflow:hidden;padding:10px 15px;position:fixed;left:0;top:0;width:100%;z-index:2;background:#666;}
.tabsNav li{float:left;width:50%;text-align:center;height:30px;line-height:30px;font-size:14px;background:#f1f1f1;}
.tabsNav li.cur{background:#f00;color:#fff;}
.tabs_con{display:none;background:#fff;font-size:12px;}
.tabs_con li{height:40px;line-height:40px;border-bottom:1px solid #e9e9e9;padding-left:10px;}
#wrapper{position:absolute;z-index:1;top:45px;bottom:48px;width:100%;overflow:auto;}
#scroller{position:absolute;z-index:1;-webkit-tap-highlight-color:rgba(0,0,0,0);width:100%;}
#pullDown, #pullUp{height:40px;line-height:40px;font-size:12px;color:#888;text-align:center;}
#pullDown .pullDownIcon, #pullUp .pullUpIcon{position:absolute;margin:8px 0 0 30%;width:24px;height:24px;background:url(images/arrow.png) 0 0 no-repeat;
-webkit-background-size:auto 100%;
background-size:auto 100%;
-webkit-transition-property:-webkit-transform;
-webkit-transition-duration:250ms;
}
#pullDown .pullDownIcon{-webkit-transform:rotate(0deg) translateZ(0);}
#pullUp .pullUpIcon{-webkit-transform:rotate(-180deg) translateZ(0);}
#pullDown.flip .pullDownIcon{-webkit-transform:rotate(-180deg) translateZ(0);}
#pullUp.flip .pullUpIcon {-webkit-transform:rotate(0deg) translateZ(0);}
#pullDown.loading .pullDownIcon, #pullUp.loading .pullUpIcon{background-image: url(images/loader.png);background-size:100% auto;background-position:0 100%;
-webkit-transform:rotate(0deg) translateZ(0);
-webkit-transition-duration:0ms;
-webkit-animation-name:loading;
-webkit-animation-duration:2s;
-webkit-animation-iteration-count:infinite;
-webkit-animation-timing-function:linear;
}
@-webkit-keyframes loading {
from{-webkit-transform:rotate(0deg) translateZ(0);}
to{-webkit-transform:rotate(360deg) translateZ(0);}
}
</style>
</head>
<body>
<ul class="tabsNav">
<li class="cur">公告</li>
<li>消息</li>
</ul>
<div id="wrapper">
<div id="scroller">
<div class="pullDown" id="pullDown">
<div class="pullDownIcon"></div><div class="pullDownLabel">下拉刷新</div>
</div>
<div class="tabs_con" style="display:block;">
<ul></ul>
</div>
<div class="tabs_con">
<ul></ul>
</div>
<div class="pullUp" id="pullUp">
<div class="pullUpIcon"></div><div class="pullUpLabel">上拉加載更多</div>
</div>
</div>
</div>
<script src="js/zepto.min.js"></script>
<script src="js/iscroll.js"></script>
<script>
var pageNoticeIndex = 1, //當前頁
pageMsgIndex = 1,
pageSize = 5, //每頁數量
load1More = false, //判斷是否全部加載完畢
load2More = false;
//tab切換
$('.tabsNav li').on('click',function(){
var $this = $(this),
curIndex = $this.index();
$this.addClass('cur').siblings('li').removeClass('cur');
$('.tabs_con').eq(curIndex).css("display","block").siblings('.tabs_con').css("display","none");
myScroll.scrollTo(0, 0); //確保每次切換時scroll回到初始起點
myScroll.refresh(); //每次切換時都要調用界面更新方法
if(curIndex == 0){
if(!load1More){
$("#pullUp").html('<div class="pullUpIcon"></div><div class="pullUpLabel">上拉加載更多</div>');
}else{
$("#pullUp").html("已無更多數據");
}
}else if(curIndex == 1){
if(!load2More){
$("#pullUp").html('<div class="pullUpIcon"></div><div class="pullUpLabel">上拉加載更多</div>');
}else{
$("#pullUp").html("已無更多數據");
}
}
});
//公告
pageNoitce(pageNoticeIndex, 0); //初始化加載數據 第一個參數是當前頁，第二個參數是當前選中的tab的索引
function pageNoitce(pageIndex, curIndex) {
var html = "";
$.post(url, data, function (success) {
if (success != null && success.status == 1) {
for (var i = 0; i < success.data.length; i++) {
html += '<li><a href="#">'+success.data[i].Title + '</a></li>';
}
var pageCount = parseInt(success.page.totRecord);
var page = Math.ceil(pageCount / pageSize);
if (page == pageIndex) {
load1More = true;
}
$(".tabs_con").eq(curIndex).children("ul").append(html);
}
}, "json");
}
//消息
pageMsg(pageMsgIndex, 1);
function pageMsg(pageIndex, curIndex) {
var html = "";
$.post(url, data, function (res) {
if (res != null && res.status == 1) {
for (var i = 0; i < res.data.length; i++) {
html += '<li><a href="#">' + res.data[i].Title + '</i></a></li>';
}
var pageCount = parseInt(res.page.totRecord);
var page = Math.ceil(pageCount / pageSize);
if (page == pageIndex) {
load2More = true;
}
$(".tabs_con").eq(curIndex).children("ul").append(html);
}
},"json");
}
var myScroll;
function pullDownAction () {
setTimeout(function () {
myScroll.refresh();
}, 1000);
}
function pullUpAction () {
setTimeout(function () {
var curIndex = $(".cur").index();
if(curIndex == 0){
if(!load1More){
pageNoticeIndex += 1;
pageNoitce(pageNoticeIndex, curIndex);
}else{
$("#pullUp").html("已無更多數據");
}
}else if(curIndex == 1){
if(!load2More){
pageMsgIndex += 1;
pageMsg(pageMsgIndex, curIndex);
}else{
$("#pullUp").html("已無更多數據");
}
}
myScroll.refresh();
}, 1000);
}
function loaded() {
var pullDownEl = $('#pullDown'),
pullDownHeight = pullDownEl.height(),
pullUpEl = $('#pullUp'),
pullUpHeight = pullUpEl.height(),
pullDownLabel = $('.pullDownLabel'),
pullUpLabel = $('.pullUpLabel');
myScroll = new iScroll('wrapper', {
topOffset: pullDownHeight - 5,
onRefresh: function () {
if (pullDownEl.hasClass('loading')) {
pullDownEl.removeClass();
pullDownLabel.html("下拉刷新");
} else if (pullUpEl.hasClass('loading')) {
pullUpEl.removeClass();
pullUpLabel.html("上拉加載更多");
}
},
onScrollMove: function () {
if (this.y > 5 && !pullDownEl.hasClass('flip')) {
pullDownEl.removeClass().addClass('flip');
pullDownLabel.html("釋放立即刷新");
this.minScrollY = 0;
} else if (this.y < 5 && pullDownEl.hasClass('flip')) {
pullDownEl.removeClass();
pullDownLabel.html("下拉刷新");
this.minScrollY = -pullDownHeight;
} else if (this.y < (this.maxScrollY - 5) && !pullUpEl.hasClass('flip')) {
pullUpEl.removeClass().addClass('flip');
pullUpLabel.html("釋放加載更多");
this.maxScrollY = this.maxScrollY;
} else if (this.y > (this.maxScrollY + 5) && pullUpEl.hasClass('flip')) {
pullUpEl.removeClass();
pullUpLabel.html("上拉加載更多");
this.maxScrollY = pullUpHeight;
}
},
onScrollEnd: function () {
if (pullDownEl.hasClass('flip')) {
pullDownEl.removeClass().addClass('loading');
pullDownLabel.html("加載中...");
pullDownAction();
} else if (pullUpEl.hasClass('flip')) {
pullUpEl.removeClass().addClass('loading');
pullUpLabel.html("加載中...");
pullUpAction();
}
}
});
}
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', function () { setTimeout(loaded, 200); }, false);
</script>
</body>
</html>
效果如下圖：
