jQuery-瀑布流的取巧做法分享
分析：瀑布流，做法有2种
（1）绝对定位方案：每个单元格设置为绝对定位，通过计算，分别设置 top , left 即可实现
（2）浮动方案：弄N列布局（浮动），然后图片数据，按顺序依次插入，如N为3列 ，第一张图片插入到第一列，第二张图片插入到第二列，第三张图片插入到第三列，第四张图片插入到第一列........这样循环插入（不能自适应）
浮动方案例子：
预览地址：http://lgy.1zwq.com/wallPics/
CSS与HTML代码：
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body,ul,li{margin:0;margin:0;}
ul{list-style:none;}
.clearfix:after{visibility:hidden;display:block;font-size:0;content:" ";clear:both; height:0;}.clearfix{*zoom:1}
/*瀑布流*/
.wallList{width:860px;}
.wallList li{float:left;display:inline;margin-right:16px;}
.wallList li a{background:#eee;border:1px solid #ccc;padding:5px 5px 0 5px;display:block;margin-bottom:10px;}
.wallList li a:hover{border-color:#f60;}
.wallList li .name{display:block;text-align:center;padding:8px 0;}
.loadTips{text-align:center;padding:15px 0;}
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<div class="wallList" id="wallList">
<ul class="clearfix">
<li></li>
<li></li>
<li></li>
</ul>
<p class="loadTips" id="loadTips"><span>正在加载......</span></p>
</div>
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使用jQuery实现，大概思路如下：
给 window 绑定 scroll事件，下拉的时候获取 $(document).scrollTop() ，然后获取N列中 最小的高度值，JS提供的API是Math.min()，但这个API最多只能传入 2 个参数，所以就需要用aplly来扩展，
Math.min.apply(null,[xxx,xxx,xxxx,xxxx]) ，当 $(document).scrollTop() 大于 最小的高度值，就Ajax请求url，如果有数据，就往页面插入HTML结构，没有则提示 “加载完”
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// 数据格式
var testJson = {
"status":1,
"data":[
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x300/B5E61D/fff","width":240,"height":300,"name":"图片1"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x210/333/fff","width":240,"height":210,"name":"图片2"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x190/f60/fff","width":240,"height":190,"name":"图片3"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x230/B5E61D/fff","width":240,"height":230,"name":"图片4"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x280/B5E61D/fff","width":240,"height":280,"name":"图片5"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x260/eee/fff","width":240,"height":260,"name":"图片6"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x180/000/fff","width":240,"height":180,"name":"图片7"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x240/B5E61D/fff","width":240,"height":240,"name":"图片8"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x265/B5E61D/fff","width":240,"height":265,"name":"图片9"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x245/259/fff","width":240,"height":245,"name":"图片10"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x310/B5E61D/fff","width":240,"height":310,"name":"图片11"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x210/B5E61D/fff","width":240,"height":210,"name":"图片12"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x150/B5E61D/fff","width":240,"height":150,"name":"图片13"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x165/B5E61D/fff","width":240,"height":165,"name":"图片14"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x100/B5E61D/fff","width":240,"height":100,"name":"图片15"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x280/B5E61D/fff","width":240,"height":280,"name":"图片16"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x225/B5E61D/fff","width":240,"height":225,"name":"图片17"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x210/B5E61D/fff","width":240,"height":210,"name":"图片18"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x230/B5E61D/fff","width":240,"height":230,"name":"图片19"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x210/B5E61D/fff","width":240,"height":210,"name":"图片20"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x300/B5E61D/fff","width":240,"height":300,"name":"图片21"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x210/333/fff","width":240,"height":210,"name":"图片22"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x190/f60/fff","width":240,"height":190,"name":"图片23"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x230/B5E61D/fff","width":240,"height":230,"name":"图片24"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x280/B5E61D/fff","width":240,"height":280,"name":"图片25"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x210/eee/fff","width":240,"height":210,"name":"图片26"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x180/000/fff","width":240,"height":180,"name":"图片27"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x240/B5E61D/fff","width":240,"height":240,"name":"图片28"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x195/B5E61D/fff","width":240,"height":195,"name":"图片29"},
{"href":"http:xxxxxxx","src":"http://dummyimage.com/240x245/259/fff","width":240,"height":245,"name":"图片30"}
]
}
var wallPic = function(){
var $target = $('#wallList'),
$li = $target.find('li'),
$tips = $('#loadTips'),
oTop = 0,//滚动判断的值
row = 3,//列数
page = 1,//ajax请求的页码值
url = 'xxxx', //ajax请求地址
on_off = true; //插入结构的开关，防止ajax错误性多次加载数据
return{
fillData:function(callback){
var _that = this;
on_off = false;
/* ajax
--------------------*/
// $.get(url,{ page:page,count:30 },function(json){
// if(json.status==1){
// _that.appenDHTML(json.data);
// on_off = true;
// page++;
// }else{
// _that.loadedTips();
// }
// },'json');
/* 模拟测试-设置定时器模拟ajax请求数据
-----------------------*/
setTimeout(function(){
// 模拟终止
if(page==3){
_that.loadedTips();
return;
}
_that.appendHTML(testJson.data);
on_off = true;
page++;
},400);
},
appendHTML:function(data){
var len = data.length,
n = 0;
for(;n<len;n++){
var k = 0;
n>(row-1)?k=n%row:k=n;
$li[k].innerHTML += '<a href="'+data[n].href+'" target="_blank"><img src="'+data[n].src+'" width="'+data[n].width+'" height="'+data[n].height+'" alt="'+data[n].name+'" /><span class="name">'+data[n].name+'</span></a>';
}
this.getOTop();
},
getOTop:function(){
oTop = Math.min.apply(null,[$li.eq(0).height(),$li.eq(1).height(),$li.eq(2).height()])+$target.offset().top;
},
loadedTips:function(){
$('#loadTips').find('span').text('数据已加载完');
setTimeout(function(){
$('#loadTips').css({'visibility':'hidden'});
},200);
// 解绑事件
$(window).unbind('scroll',$.PRoxy(this.scrollEvent,this));
},
scrollEvent:function(){
if($(document).scrollTop()+$(window).height()>oTop&&on_off){
this.fillData();
}
},
init:function(){
this.fillData();
$(window).bind('scroll',$.proxy(this.scrollEvent,this));
}
}
}();
wallPic.init();
