关于JS和C#的自适应宽度瀑布流的问题

YAODASI 2013-04-05 02:55:27

在网上找了个“javascript实现自适应宽度的瀑布流”DEMO，挺好的，可否改良一下，让它可以连接.net后台读取图片数据，？？？因为这个代码的数据是直接写在网页上的

原来的HTML代码：
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>瀑布流布局</title>
<script type="text/javascript" language="javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script type="text/javascript" language="javascript" src="js/waterfall.js"></script>

<style type="text/css">
body{margin:0;background-color:#CCCCCC; font-family:微软雅黑;}
#flow-box{margin:10px auto 0 auto; padding:0; background-color:#CCCCCC; position:relative}
#flow-box li{
width:200px; position:absolute;background-color:#ffffff; padding:10px; border:solid 1px #efefef; list-style:none;
opacity:0;
-moz-opacity:0;
filter:alpha(opacity=0);
-webkit-transition:opacity 500ms ease-in-out;
-moz-transition:opacity 500ms ease-in-out;
-o-transition:opaicty 500ms ease-in-out;
transition:opaicty 500ms ease-in-out;}
#flow-box li img{width:100%;}
#flow-box li a{display:block; width:100%; text-align:center; font-size:14px; color:#333; line-height:18px; margin-top:10px; text-decoration:none;}
.loadwrap{position:absolute; left:0; width:100%; text-align:center;}
</style>

<script type="text/javascript" src="js/pul.js"></script>

</head>
<body>
<ul id="flow-box">

</ul>
<div id="loadimg" class="loadwrap"><img src="Images/load.gif" /></div>

<div style="display:none;" id="gotopbtn" class="to_top"><a title="返回顶部" href="javascript:void(0);"></a></div>

<script type="text/javascript">
$(function(){

$(window).scroll(function(){
$(window).scrollTop()>1000 ? $("#gotopbtn").css('display','').click(function(){
$(window).scrollTop(0);
}):$("#gotopbtn").css('display','none');
});

});
</script>
</body>
</html>

JS代码：

function flow(mh, mv) {//参数mh和mv是定义数据块之间的间距，mh是水平距离，mv是垂直距离
var w = document.documentElement.offsetWidth;//计算页面宽度
var ul = document.getElementById("flow-box");
var li = ul.getElementsByTagName("li");
var iw = li[0].offsetWidth + mh;//计算数据块的宽度
var c = Math.floor(w / iw);//计算列数
ul.style.width = iw * c - mh + "px";//设置ul的宽度至适合便可以利用css定义的margin把所有内容居中

var liLen = li.length;
var lenArr = [];
for (var i = 0; i < liLen; i++) {//遍历每一个数据块将高度记入数组
lenArr.push(li[i].offsetHeight);
}

var oArr = [];
for (var i = 0; i < c; i++) {//把第一行排放好，并将每一列的高度记入数据oArr
li[i].style.top = "0";
li[i].style.left = iw * i + "px";
li[i].style.opacity = "1";
li[i].style["-moz-opacity"] = "1";
li[i].style["filter"] = "alpha(opacity=100)";
oArr.push(lenArr[i]);
}

for (var i = c; i < liLen; i++) {//将其他数据块定位到最短的一列后面，然后再更新该列的高度
var x = _getMinKey(oArr);//获取最短的一列的索引值
li[i].style.top = oArr[x] + mv + "px";
li[i].style.left = iw * x + "px";
li[i].style.opacity = "1";
li[i].style["-moz-opacity"] = "1";
li[i].style["filter"] = "alpha(opacity=100)";
oArr[x] = lenArr[i] + oArr[x] + mv;//更新该列的高度
}
document.getElementById("loadimg").style.top = _getMaxValue(oArr) + 50 + "px";//将loading移到下面

function scroll() {//滚动加载数据

var st = oArr[_getMinKey(oArr)];
var scrollTop = document.documentElement.scrollTop > document.body.scrollTop? document.documentElement.scrollTop : document.body.scrollTop;
if (scrollTop >= st - document.documentElement.clientHeight) {
window.onscroll = null;//为防止重复执行，先清除事件
_request(null, "GetList.php", function(data) {//当滚动到达最短的一列的距离时便发送ajax请求新的数据，然后执行回调函数
_addItem(data.d , function() {//追加数据
var liLenNew = li.length;
for(var i = liLen; i < liLenNew; i++) {
lenArr.push(li[i].offsetHeight);
}
for(var i = liLen; i < liLenNew; i++) {
var x = _getMinKey(oArr);
li[i].style.top = oArr[x] + 10 + "px";
li[i].style.left = iw * x + "px";
li[i].style.opacity = "1";
li[i].style["-moz-opacity"] = "1";
li[i].style["filter"] = "alpha(opacity=100)";
oArr[x] = lenArr[i] + oArr[x] + 10;
}
document.getElementById("loadimg").style.top = _getMaxValue(oArr) + 50 + "px";//loading向下移位
liLen = liLenNew;
window.onscroll = scroll;//执行完成，恢愎onscroll事件
});
})
}
}
window.onscroll =scroll;
}

//图片加载完成后执行
window.onload = function() {flow(10, 10)};
//改变窗口大小时重新布局
var re;
window.onresize = function() {
clearTimeout(re);
re = setTimeout(function() {flow(10, 10);}, 200);
}

//追加项
function _addItem(arr, callback) {
var _html = "";
var a = 0;
var l = arr.length;
(function loadimg() {
var img = new Image();
img.onload = function() {
a += 1;
if (a == l) {
for (var k in arr) {
var img = new Image();
img.src = arr[k].img;
_html += '<li><img src="' + arr[k].img + '" /><a href="#">' + arr[k].title + '</a></li>';
}
_appendhtml(document.getElementById("flow-box"), _html);
callback();
}
else {
loadimg();
}
}
img.src = arr[a].img;
})()
}

//ajax请求
function _request(reqdata, url, callback) {
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
var data = eval("(" + xmlhttp.responseText + ")");
callback(data);
}
}
xmlhttp.open("POST", url);
xmlhttp.setRequestHeader("Content-Type", "application/json; charset=utf-8");
xmlhttp.send(reqdata);
}

//追加html
function _appendhtml(parent, child) {
if (typeof (child) == "string") {
var div = document.createElement("div");
div.innerHTML = child;
var frag = document.createDocumentFragment();
(function() {
if (div.firstChild) {
frag.appendChild(div.firstChild);
arguments.callee();
}
else {
parent.appendChild(frag);
}
})();
}
else {
parent.appendChild(child);
}
}

//获取数字数组的最大值
function _getMaxValue(arr) {
var a = arr[0];
for (var k in arr) {
if (arr[k] > a) {
a = arr[k];
}
}
return a;
}
//获取数字数组最小值的索引
function _getMinKey(arr) {
var a = arr[0];
var b = 0;
for (var k in arr) {
if (arr[k] < a) {
a = arr[k];
b = k;
}
}
return b;
}

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