APP中javascript+css3实现下拉刷新效果

原生app里的数据列表都会使用下拉刷新的效果，在webapp里可以采用iscroll、swiper等插件或框架实现，那么如何自己编码实现类似的效果呢，下面介绍使用原生js+css3实现的简单效果。

html布局

rush:xhtml;"> <Meta charset="utf-8"> <Meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no">

js逻辑

rush:js;"> var slide = function (option) { var defaults={ container:'',next:function(){} } var start,end,length,isLock = false,//是否锁定整个操作 isCanDo = false,//是否移动滑块 isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),hasTouch = 'ontouchstart' in window && !isTouchPad; var obj = document.querySelector(option.container); var loading=obj.firstElementChild; var offset=loading.clientHeight; var objparent = obj.parentElement; /*操作方法*/ var fn = { //移动容器 translate: function (diff) { obj.style.webkitTransform='translate3d(0,'+diff+'px,0)'; obj.style.transform='translate3d(0,0)'; },//设置效果时间 setTransition: function (time) { obj.style.webkitTransition='all '+time+'s'; obj.style.transition='all '+time+'s'; },//返回到初始位置 back: function () { fn.translate(0 - offset); //标识操作完成 isLock = false; },addEvent:function(element,event_name,event_fn){ if (element.addEventListener) { element.addEventListener(event_name,event_fn,false); } else if (element.attachEvent) { element.attachEvent('on' + event_name,event_fn); } else { element['on' + event_name] = event_fn; } } };

fn.translate(0-offset);
fn.addEvent(obj,'touchstart',start);
fn.addEvent(obj,'touchmove',move);
fn.addEvent(obj,'touchend',end);
fn.addEvent(obj,'mousedown',start)
fn.addEvent(obj,'mousemove',move)
fn.addEvent(obj,'mouseup',end)

//滑动开始
function start(e) {
if (objparent.scrollTop <= 0 && !isLock) {
var even = typeof event == "undefined" ? e : event;
//标识操作进行中
isLock = true;
isCanDo = true;
//保存当前鼠标Y坐标
start = hasTouch ? even.touches[0].pageY : even.pageY;
//消除滑块动画时间
fn.setTransition(0);
loading.innerHTML='下拉刷新数据';
}
return false;
}

//滑动中
function move(e) {
if (objparent.scrollTop <= 0 && isCanDo) {
var even = typeof event == "undefined" ? e : event;
//保存当前鼠标Y坐标
end = hasTouch ? even.touches[0].pageY : even.pageY;
if (start < end) {
even.preventDefault();
//消除滑块动画时间
fn.setTransition(0);
//移动滑块
if((end-start-offset)/2<=150) {
length=(end - start - offset) / 2;
fn.translate(length);
}
else {
length+=0.3;
fn.translate(length);
}
}
}
}
//滑动结束
function end(e) {
if (isCanDo) {
isCanDo = false;
//判断滑动距离是否大于等于指定值
if (end - start >= offset) {
//设置滑块回弹时间
fn.setTransition(1);
//保留提示部分
fn.translate(0);
//执行回调函数
loading.innerHTML='正在刷新数据';
if (typeof option.next == "function") {
option.next.call(fn,e);
}
} else {
//返回初始状态
fn.back();
}
}
}
}
slide({container:"#container",next: function (e) {
//松手之后执行逻辑,ajax请求数据，数据返回后隐藏加载中提示
var that = this;
setTimeout(function () {
that.back.call();
},2000);
}});

代码不是很多，细节还需完善。