JQuery插件iScroll实现下拉刷新，滚动翻页特效
投稿：hebedich
下拉自动加载进行分页的运用越来越多，比起传统的分页该方法分页用户体验更好，布局也更简单了。目前正在使用和学习中……
JQuery插件：iScroll
页面布局：
<div id="wrapper">
<div id="scroller">
<div id="pullDown">
<span class="pullDownIcon"></span><span class="pullDownLabel">下拉刷新...</span>
</div>
<ul id="thelist">
<li>
<img src="img/page1_img1.jpg" />
</li>
<li>
<img src="img/page1_img2.jpg" />
</li>
<li>
<img src="img/page1_img3.jpg" />
</li>
<li>
<img src="img/page1_img1.jpg" />
</li>
<li>
<img src="img/page1_img2.jpg" />
</li>
<li>
<img src="img/page1_img3.jpg" />
</li>
</ul>
<div id="pullUp">
<span class="pullUpIcon"></span><span class="pullUpLabel">上拉加载更多...</span>
</div>
</div>
翻页，是通过ajax请求，把页码传入一般处理程序，在一般处理程序中获得分页后的数据返回json数组对象。
下拉刷新：
/**
* 下拉刷新 （自定义实现此方法）
* myScroll.refresh(); // 数据加载完成后，调用界面更新方法
*/
function pullDownAction() {
setTimeout(function () {
var el, li, i;
el = document.getElementById('thelist');
//==========================================
$.ajax({
type: "GET",
url: "LoadMore.ashx",
data: { page: generatedCount },
dataType: "json",
success: function (data) {
var json = data;
$(json).each(function () {
li = document.createElement('li');
// li.innerText = 'Generated row ' + (++generatedCount);
li.innerHTML = '<img src="' + this.src + '"/>';
el.insertBefore(li, el.childNodes[0]);
})
}
});
myScroll.refresh(); //数据加载完成后，调用界面更新方法 Remember to refresh when contents are loaded (ie: on ajax completion)
}, 1000); // <-- Simulate network congestion, remove setTimeout from production!
}
上拉刷新
function pullUpAction() {
setTimeout(function () {
var el, li, i;
el = document.getElementById('thelist');
//==========================================
$.ajax({
type: "GET",
url: "LoadMore.ashx",
data: { page: generatedCount },
dataType: "json",
success: function (data) {
var json = data;
$(json).each(function () {
li = document.createElement('li');
// li.innerText = 'Generated row ' + (++generatedCount);
li.innerHTML = '<img src="' + this.src + '"/>;
el.insertBefore(li, el.childNodes[0]);
})
}
});
//============================================
myScroll.refresh(); // 数据加载完成后，调用界面更新方法 Remember to refresh when contents are loaded (ie: on ajax completion)
}, 1000); // <-- Simulate network congestion, remove setTimeout from production!
}
初始化
/**
* 初始化iScroll控件
*/
function loaded() {
pullDownEl = document.getElementById('pullDown');
pullDownOffset = pullDownEl.offsetHeight;
pullUpEl = document.getElementById('pullUp');
pullUpOffset = pullUpEl.offsetHeight;
myScroll = new iScroll('wrapper', {
scrollbarClass: 'myScrollbar', /* 重要样式 */
useTransition: false,
topOffset: pullDownOffset,
onRefresh: function () {
if (pullDownEl.className.match('loading')) {
pullDownEl.className = '';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
} else if (pullUpEl.className.match('loading')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
}
},
onScrollMove: function () {
if (this.y > 5 && !pullDownEl.className.match('flip')) {
pullDownEl.className = 'flip';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '松手开始更新...';
this.minScrollY = 0;
} else if (this.y < 5 && pullDownEl.className.match('flip')) {
pullDownEl.className = '';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
this.minScrollY = -pullDownOffset;
} else if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
pullUpEl.className = 'flip';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '松手开始更新...';
this.maxScrollY = this.maxScrollY;
} else if (this.y > (this.maxScrollY + 5) && pullUpEl.className.match('flip')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
this.maxScrollY = pullUpOffset;
}
},
onScrollEnd: function () {
if (pullDownEl.className.match('flip')) {
pullDownEl.className = 'loading';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '加载中...';
pullDownAction(); // Execute custom function (ajax call?)
} else if (pullUpEl.className.match('flip')) {
pullUpEl.className = 'loading';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '加载中...';
pullUpAction(); // Execute custom function (ajax call?)
}
}
});
setTimeout(function () { document.getElementById('wrapper').style.left = '0'; }, 800);
}
//初始化绑定iScroll控件
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', loaded, false);