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这里我们做了两个主要的盒子，在两个盒子内实现上拉加载。结构很简单。
css样式
* {
margin: 0;
padding: 0;
}
.main-box {
background: skyblue;
width: 100%;
height: 300px;
overflow: hidden;
}
.popup-box {
width: 100%;
}
.item {
width: 100%;
line-height: 40px;
text-align: center;
padding: 20px;
box-sizing: border-box;
}
.tips{
text-align: center;
}
#box2 {
margin-top: 50px;
}最外面的盒子设置overflow: hidden;中间盒子不设置高度，靠子盒子item撑起。
js代码
/*下拉加载*/
function tDscroll(obj) {
this.key = true; //防止重复的请求
this.dom = obj.dom; //传入的dom
this.fn = obj.fn; //回调函数
this.outDom = this.dom.querySelector(".popup-box"); //获取内容盒子
this.showHeight = dom.offsetHeight; //显示的高度
this.actualHeight = this.outDom.offsetHeight; //获取实际高度的内容
this.startY = 0; //起始点击位置
this.changedY = 0; //手指移动的距离
this.originY = 0; //偏移量
var that = this;
this.dom.addEventListener("touchstart",function (ev) {
that.onStart(ev);
});
this.dom.addEventListener("touchmove",function (ev) {
that.onMove(ev);
});
this.dom.addEventListener("touchend",function (ev) {
that.onEnd(ev);
});
this.fn.call(this,this.outDom);
};
tDscroll.prototype.onStart = function (ev) {
this.startY = ev.targetTouches[0].clientY;
var tempArr = window.getComputedStyle(this.outDom).transform.split(",");
if (tempArr.length > 2) {
this.originY = parseInt(tempArr[tempArr.length - 1]) || 0;
}
};
tDscroll.prototype.onMove = function (ev) {
this.changedY = ev.touches[0].clientY - this.startY;
var changNum = (this.originY + this.changedY);
var scrollHeight = -changNum + this.showHeight;
if (changNum > 50)return;
if (scrollHeight > this.actualHeight + 50)return;
if (scrollHeight > this.actualHeight - 50 && this.key) {
this.fn.call(this,this.outDom);
}
this.outDom.style.cssText = "transform: translateY(" + changNum + "px);";
};
tDscroll.prototype.onEnd = function() {
if ((this.originY + this.changedY) > 50 ) {
this.outDom.style.cssText = "transform: translateY(0px);transition:all .3s";
}
if (-(this.originY + this.changedY) + this.showHeight > this.actualHeight + 50) {
this.outDom.style.cssText = "transform: translateY(-"+(this.actualHeight - this.showHeight)+"px);transition:all .3s";
}
};
var dom = document.querySelector("#box1"); //获取dom
var dom2 = document.querySelector("#box2"); //获取dom
var obj = {
dom : dom,
fn : add
};
var obj2 = {
dom : dom2,
fn : add
};
new tDscroll(obj);
new tDscroll(obj2);
var page = 0; //当前的页数(模拟用)
// 模拟ajax
function add(outDom) {
var that = this;
this.key = false;
var str = "";
for (var i = 1;i < 11;i++) {
str+=""+(i+((page)*10))+""
}
page++;
setTimeout(function () {
var tips = outDom.querySelector(".tips"); //获取提升
tips && outDom.removeChild(tips); //如果不是第一次 添加
str += "加载更多";
outDom.innerHTML += str;
that.actualHeight = outDom.offsetHeight;
that.key = true;
},2000)
} 原理也是很简单，监听手势事件判断是否距离足够，足够就可以添加数据啦~~~
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