JavaScript实现无穷滚动加载数据(2)

window.onload = function(){ waterFull('main','box'); var DataIn = {"data":[{"src":'0.jpg'},{"src":'1.jpg'},{"src":'2.jpg'},{"src":'3.jpg'},{"src":'4.jpg'},{"src":'5.jpg'}]}; window.onscroll = function(){ var oparent = document.getElementById('main'); if(checkScrollSlide){ for(var i = 0; i< DataIn.data.length; i++){ var oBox = document.createElement('div'); oBox.className = 'box'; oparent.appendChild(oBox); var opic = document.createElement('div'); opic.className = 'pic'; oBox.appendChild(opic); var oImg = document.createElement('img'); oImg.src = './images/'+DataIn.data[i].src; opic.appendChild(oImg); } waterFull('main','box'); } } } function waterFull(parent,children){ var oParent = document.getElementById(parent); //var oBoxs = parent.querySelectorAll(".box"); var oBoxs = getByClass(oParent,children); //计算整个页面显示的列数 var oBoxW = oBoxs[0].offsetWidth; var cols = Math.floor(document.documentElement.clientWidth/oBoxW); //设置main的宽度，并且居中 oParent.style.cssText = 'width:'+oBoxW * cols +'px; margin: 0 auto'; //找出高度最小的图片，将下一个图片放在下面 //定义一个数组，存放每一列的高度，初始化存的是第一行的所有列的高度 var arrH = []; for(var i = 0; i< oBoxs.length ; i++){ if(i < cols){ arrH.push(oBoxs[i].offsetHeight); } else{ var minH = Math.min.apply(null,arrH); var minIndex = getMinhIndex(arrH,minH); oBoxs[i].style.position = 'absolute'; oBoxs[i].style.top= minH + 'px'; //oBoxs[i].style.left = minIndex * oBoxW + 'px'; oBoxs[i].style.left = oBoxs[minIndex].offsetLeft+'px'; arrH[minIndex] += oBoxs[i].offsetHeight; } } } function getByClass(parent,className){ var boxArr = new Array();//用来获取所有class为box的元素 oElement = parent.getElementsByTagName('*'); for (var i = 0; i <oElement.length; i++) { if(oElement[i].className == className){ boxArr.push(oElement[i]); } }; return boxArr; } //获取当前最小值得下标 function getMinhIndex(array,min){ for(var i in array){ if(array[i] == min) return i; } } //检测是否具备滚动条加载数据块的条件 function checkScrollSlide(){ var oparent = document.getElementById('main'); var oBoxs = getByClass(oparent,'box'); var scrollH = document.body.scrollTop || document.documentElement.scrollTop + document.body.clientHeight || document.documentElement.clientHeight; var lastBoxH = oBoxs[oBoxs.length - 1].offsetTop + Math.floor(oBoxs[oBoxs.length - 1].offsetHeight/2); return (lastBoxH < scrollH )? true : false; }