PHP和Jquery和ajax实现瀑布流
- WBOYasal
- 2016-06-07 11:35:461253semak imbas
PHP和Jquery和ajax实现下拉淡出瀑布流效果（无需插件）
不废话，直接上代码，您也可以点这里看瀑布流演示http://www.shouce.ren/post/xiaohua。
前台：<?php <br />
$category=$this->getMyVal('category',$_GET);<br>
$xiaohuaList=Xiaohua::model()->getXiaohao($category); //打开页面默认显示的数据<br>
?><br>
<br>
<div>
<br>
<?php foreach ($xiaohuaList as $xiaohua):?><br>
<?php $q_id=$xiaohua->id;?><br>
<div>
<br>
<div>
<span></span><strong>"><?php echo CHtml::encode($xiaohua->title);?></strong>
</div>
<br>
<div>"><?php echo $xiaohua->content;?></div>
<br>
<div><span>);" class="fx cursor_p" data-id="<?php echo $q_id;?>"><span></span>分享</span></div>
<br>
</div>
<br>
<?php endforeach;?><br>
</div>
<br>
<script><br />
var opt={<br />
getResource:function(index,render){//index为已加载次数,render为渲染接口函数,接受一个dom集合或jquery对象作为参数。通过ajax等异步方法得到的数据可以传入该接口进行渲染，如 render(elem)<br />
var html='';<br />
var _url='<?php echo $this->createUrl('listXiaohua');?>';<br />
$.ajax({<br />
type: "get",<br />
url: _url,<br />
dataType : "json",<br />
async:false,<br />
success: function(data){<br />
for( var i in data){<br />
var q_id=data[i].id;<br />
html+='<div class="cell m-bg item-h border_h"><div class="border-solid-b padding-b-5 text-center"><span class="g-bg glyphicon glyphicon-sunglasses margin-r-5" aria-hidden="true"><strong class="color-5 fx_t_'+q_id+'">'+data[i].title+'<div class="padding-t-5 fx_c_'+q_id+'">'+data[i].content+''<br />
+'<div class="padding-t-5 text-right"><span onclick="fx('+q_id+');" class="fx cursor_p" data-id="'+q_id+'"><span class="g-bg glyphicon glyphicon-share-alt margin-r-5" aria-hidden="true">分享';<br />
}<br />
}});<br />
return $(html);<br />
},<br />
column_width:376,<br />
column_space:10,<br />
auto_imgHeight:true,<br />
insert_type:1<br />
}<br />
$('#waterfall').waterfall(opt);<br />
</script>后台：public function actionListXiaohua() {<br>
$xiaohuaList=Xiaohua::model()->getXiaohua();//获取笑话信息<br>
echo CJSON::encode($xiaohuaList);<br>
}js：;(function($){<br>
var<br>
//参数<br>
setting={<br>
column_width:240,//列宽<br>
column_className:'waterfall_column',//列的类名<br>
column_space:2,//列间距<br>
cell_selector:'.cell',//要排列的砖块的选择器，context为整个外部容器<br>
img_selector:'img',//要加载的图片的选择器<br>
auto_imgHeight:true,//是否需要自动计算图片的高度<br>
fadein:true,//是否渐显载入<br>
fadein_speed:600,//渐显速率，单位毫秒<br>
insert_type:1, //单元格插入方式，1为插入最短那列，2为按序轮流插入<br>
getResource:function(index){ } //获取动态资源函数,必须返回一个砖块元素集合,传入参数为加载的次数<br>
},<br>
//<br>
waterfall=$.waterfall={},//对外信息对象<br>
$waterfall=null;//容器<br>
waterfall.load_index=0, //加载次数<br>
$.fn.extend({<br>
waterfall:function(opt){<br>
opt=opt||{};<br>
setting=$.extend(setting,opt);<br>
$waterfall=waterfall.$waterfall=$(this);<br>
waterfall.$columns=creatColumn();<br>
render($(this).find(setting.cell_selector).detach(),false); //重排已存在元素时强制不渐显<br>
waterfall._scrollTimer2=null;<br>
$(window).bind('scroll',function(){<br>
clearTimeout(waterfall._scrollTimer2);<br>
waterfall._scrollTimer2=setTimeout(onScroll,300);<br>
});<br>
waterfall._scrollTimer3=null;<br>
$(window).bind('resize',function(){<br>
clearTimeout(waterfall._scrollTimer3);<br>
waterfall._scrollTimer3=setTimeout(onResize,300);<br>
});<br>
}<br>
});<br>
function creatColumn(){//创建列<br>
waterfall.column_num=calculateColumns();//列数<br>
//循环创建列<br>
var html='';<br>
for(var i=0;i<waterfall.column_num></waterfall.column_num>
html+='<div></div>';<br>
}<br>
$waterfall.prepend(html);//插入列<br>
return $('.'+setting.column_className,$waterfall);//列集合<br>
}<br>
function calculateColumns(){//计算需要的列数<br>
var num=Math.floor(($waterfall.innerWidth())/(setting.column_width+setting.column_space));<br>
if(num
return num;<br>
}<br>
function render(elements,fadein){//渲染元素<br>
if(!$(elements).length) return;//没有元素<br>
var $columns = waterfall.$columns;<br>
$(elements).each(function(i){<br>
if(!setting.auto_imgHeight||setting.insert_type==2){//如果给出了图片高度，或者是按顺序插入，则不必等图片加载完就能计算列的高度了<br>
if(setting.insert_type==1){<br>
insert($(elements).eq(i),setting.fadein&&fadein);//插入元素<br>
}else if(setting.insert_type==2){<br>
insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素<br>
}<br>
return true;//continue<br>
}<br>
if($(this)[0].nodeName.toLowerCase()=='img'||$(this).find(setting.img_selector).length>0){//本身是图片或含有图片<br>
var image=new Image;<br>
var src=$(this)[0].nodeName.toLowerCase()=='img'?$(this).attr('src'):$(this).find(setting.img_selector).attr('src');<br>
image.onload=function(){//图片加载后才能自动计算出尺寸<br>
image.onreadystatechange=null;<br>
if(setting.insert_type==1){<br>
insert($(elements).eq(i),setting.fadein&&fadein);//插入元素<br>
}else if(setting.insert_type==2){<br>
insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素<br>
}<br>
image=null;<br>
}<br>
image.onreadystatechange=function(){//处理IE等浏览器的缓存问题：图片缓存后不会再触发onload事件<br>
if(image.readyState == "complete"){<br>
image.onload=null;<br>
if(setting.insert_type==1){<br>
insert($(elements).eq(i),setting.fadein&&fadein);//插入元素<br>
}else if(setting.insert_type==2){<br>
insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素<br>
}<br>
image=null;<br>
}<br>
}<br>
image.src=src;<br>
}else{//不用考虑图片加载<br>
if(setting.insert_type==1){<br>
insert($(elements).eq(i),setting.fadein&&fadein);//插入元素<br>
}else if(setting.insert_type==2){<br>
insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素<br>
}<br>
}<br>
});<br>
}<br>
function public_render(elems){//ajax得到元素的渲染接口<br>
render(elems,true);<br>
}<br>
function insert($element,fadein){//把元素插入最短列<br>
if(fadein){//渐显<br>
$element.css('opacity',0).appendTo(waterfall.$columns.eq(calculateLowest())).fadeTo(setting.fadein_speed,1);<br>
}else{//不渐显<br>
$element.appendTo(waterfall.$columns.eq(calculateLowest()));<br>
}<br>
}<br>
function insert2($element,i,fadein){//按序轮流插入元素<br>
if(fadein){//渐显<br>
$element.css('opacity',0).appendTo(waterfall.$columns.eq(i%waterfall.column_num)).fadeTo(setting.fadein_speed,1);<br>
}else{//不渐显<br>
$element.appendTo(waterfall.$columns.eq(i%waterfall.column_num));<br>
}<br>
}<br>
function calculateLowest(){//计算最短的那列的索引<br>
var min=waterfall.$columns.eq(0).outerHeight(),min_key=0;<br>
waterfall.$columns.each(function(i){<br>
if($(this).outerHeight()<min></min>
min=$(this).outerHeight();<br>
min_key=i;<br>
}<br>
});<br>
return min_key;<br>
}<br>
function getElements(){//获取资源<br>
$.waterfall.load_index++;<br>
return setting.getResource($.waterfall.load_index,public_render);<br>
}<br>
waterfall._scrollTimer=null;//延迟滚动加载计时器<br>
function onScroll(){//滚动加载<br>
clearTimeout(waterfall._scrollTimer);<br>
waterfall._scrollTimer=setTimeout(function(){<br>
var $lowest_column=waterfall.$columns.eq(calculateLowest());//最短列<br>
var bottom=$lowest_column.offset().top+$lowest_column.outerHeight();//最短列底部距离浏览器窗口顶部的距离<br>
var scrollTop=document.documentElement.scrollTop||document.body.scrollTop||0;//滚动条距离<br>
var windowHeight=document.documentElement.clientHeight||document.body.clientHeight||0;//窗口高度<br>
if(scrollTop>=bottom-windowHeight){<br>
render(getElements(),true);<br>
}<br>
},100);<br>
}<br>
function onResize(){//窗口缩放时重新排列<br>
if(calculateColumns()==waterfall.column_num) return; //列数未改变，不需要重排<br>
var $cells=waterfall.$waterfall.find(setting.cell_selector);<br>
waterfall.$columns.remove();<br>
waterfall.$columns=creatColumn();<br>
render($cells,false); //重排已有元素时强制不渐显<br>
}<br>
})(jQuery);好了，全部完成了。这里看瀑布流演示http://www.shouce.ren/post/xiaohua。
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