PHP和Jquery和ajax实现下拉淡出瀑布流效果（无需插件），jqueryajax_PHP教程

<br /><?php <br />$category=$this->getMyVal('category',$_GET);<br />$xiaohuaList=Xiaohua::model()->getXiaohao($category); //打开页面默认显示的数据<br />?><br /><br /><div id="waterfall">
	<?php foreach ($xiaohuaList as $xiaohua):?>
		<?php $q_id=$xiaohua->id;?>
		<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"></span><strong class="color-5 fx_t_<?php echo $q_id;?>"><?php echo CHtml::encode($xiaohua->title);?></strong></div>
			<div class="padding-t-5 fx_c_<?php echo $q_id;?>"><?php echo $xiaohua->content;?></div>
			<div class="padding-t-5 text-right"><span onclick="fx(<?php echo $q_id;?>);" class="fx cursor_p" data-id="<?php echo $q_id;?>"><span class="g-bg glyphicon glyphicon-share-alt margin-r-5" aria-hidden="true"></span>分享</span></div>
		</div>
	<?php endforeach;?>
</div>
<script>
var opt={
  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)
	  var html='';
	  var _url='<?php echo $this->createUrl('listXiaohua');?>';
	  $.ajax({
		type: "get",
		url: _url,
		dataType : "json",
		async:false,
		success: function(data){
			for( var i in data){
				var q_id=data[i].id;
	        	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"></span><strong class="color-5 fx_t_'+q_id+'">'+data[i].title+'</strong></div><div class="padding-t-5 fx_c_'+q_id+'">'+data[i].content+'</div>'
	        		 +'<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"></span>分享</span></div></div>';
	        }
	  }});
	  return $(html);
  },
  column_width:376,
  column_space:10,
  auto_imgHeight:true,
  insert_type:1
}
$('#waterfall').waterfall(opt);
</script>

	public function actionListXiaohua() {
		$xiaohuaList=Xiaohua::model()->getXiaohua();//获取笑话信息
		echo CJSON::encode($xiaohuaList);
	}

;(function($){
   var
   //参数
   setting={
      column_width:240,//列宽
	  column_className:'waterfall_column',//列的类名
	  column_space:2,//列间距
	  cell_selector:'.cell',//要排列的砖块的选择器，context为整个外部容器
	  img_selector:'img',//要加载的图片的选择器
	  auto_imgHeight:true,//是否需要自动计算图片的高度
	  fadein:true,//是否渐显载入
	  fadein_speed:600,//渐显速率，单位毫秒
	  insert_type:1, //单元格插入方式，1为插入最短那列，2为按序轮流插入
	  getResource:function(index){ }  //获取动态资源函数,必须返回一个砖块元素集合,传入参数为加载的次数
   },
   //
   waterfall=$.waterfall={},//对外信息对象
   $waterfall=null;//容器
   waterfall.load_index=0, //加载次数
   $.fn.extend({
       waterfall:function(opt){
		  opt=opt||{};
	      setting=$.extend(setting,opt);
		  $waterfall=waterfall.$waterfall=$(this);
		  waterfall.$columns=creatColumn();
		  render($(this).find(setting.cell_selector).detach(),false); //重排已存在元素时强制不渐显
		  waterfall._scrollTimer2=null;
		  $(window).bind('scroll',function(){
		     clearTimeout(waterfall._scrollTimer2);
			 waterfall._scrollTimer2=setTimeout(onScroll,300);
		  });
		  waterfall._scrollTimer3=null;
		  $(window).bind('resize',function(){
		     clearTimeout(waterfall._scrollTimer3);
			 waterfall._scrollTimer3=setTimeout(onResize,300);
		  });
	   }
   });
   function creatColumn(){//创建列
      waterfall.column_num=calculateColumns();//列数
	  //循环创建列
	  var html='';
	  for(var i=0;i<waterfall.column_num;i++){
	     html+='<div class="'+setting.column_className+'" style="width:'+setting.column_width+'px; display:inline-block; *display:inline;zoom:1; margin-left:'+setting.column_space/2+'px;margin-right:'+setting.column_space/2+'px; vertical-align:top; overflow:hidden"></div>';
	  }
	  $waterfall.prepend(html);//插入列
	  return $('.'+setting.column_className,$waterfall);//列集合
   }
   function calculateColumns(){//计算需要的列数
      var num=Math.floor(($waterfall.innerWidth())/(setting.column_width+setting.column_space));
	  if(num<1){ num=1; } //保证至少有一列
	  return num;
   }
   function render(elements,fadein){//渲染元素
      if(!$(elements).length) return;//没有元素
      var $columns = waterfall.$columns;
      $(elements).each(function(i){
		  if(!setting.auto_imgHeight||setting.insert_type==2){//如果给出了图片高度，或者是按顺序插入，则不必等图片加载完就能计算列的高度了
		     if(setting.insert_type==1){
			    insert($(elements).eq(i),setting.fadein&&fadein);//插入元素
			 }else if(setting.insert_type==2){
			    insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素
		     }
			 return true;//continue
		  }
		  if($(this)[0].nodeName.toLowerCase()=='img'||$(this).find(setting.img_selector).length>0){//本身是图片或含有图片
		      var image=new Image;
			  var src=$(this)[0].nodeName.toLowerCase()=='img'?$(this).attr('src'):$(this).find(setting.img_selector).attr('src');
			  image.onload=function(){//图片加载后才能自动计算出尺寸
			      image.onreadystatechange=null;
				  if(setting.insert_type==1){
				     insert($(elements).eq(i),setting.fadein&&fadein);//插入元素
				  }else if(setting.insert_type==2){
					 insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素
				  }
				  image=null;
			  }
			  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
			      if(image.readyState == "complete"){
					 image.onload=null;
					 if(setting.insert_type==1){
					    insert($(elements).eq(i),setting.fadein&&fadein);//插入元素
					 }else if(setting.insert_type==2){
					    insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素
					 }
					 image=null;
				  }
			  }
			  image.src=src;
		  }else{//不用考虑图片加载
		      if(setting.insert_type==1){
				 insert($(elements).eq(i),setting.fadein&&fadein);//插入元素
			  }else if(setting.insert_type==2){
				 insert2($(elements).eq(i),i,setting.fadein&&fadein);//插入元素
			  }
		  }
	  });
   }
   function public_render(elems){//ajax得到元素的渲染接口
   	  render(elems,true);
   }
   function insert($element,fadein){//把元素插入最短列
      if(fadein){//渐显
	     $element.css('opacity',0).appendTo(waterfall.$columns.eq(calculateLowest())).fadeTo(setting.fadein_speed,1);
	  }else{//不渐显
         $element.appendTo(waterfall.$columns.eq(calculateLowest()));
	  }
   }
   function insert2($element,i,fadein){//按序轮流插入元素
      if(fadein){//渐显
	     $element.css('opacity',0).appendTo(waterfall.$columns.eq(i%waterfall.column_num)).fadeTo(setting.fadein_speed,1);
	  }else{//不渐显
         $element.appendTo(waterfall.$columns.eq(i%waterfall.column_num));
	  }
   }
   function calculateLowest(){//计算最短的那列的索引
      var min=waterfall.$columns.eq(0).outerHeight(),min_key=0;
	  waterfall.$columns.each(function(i){
		 if($(this).outerHeight()<min){
		    min=$(this).outerHeight();
			min_key=i;
		 }
	  });
	  return min_key;
   }
   function getElements(){//获取资源
      $.waterfall.load_index++;
      return setting.getResource($.waterfall.load_index,public_render);
   }
   waterfall._scrollTimer=null;//延迟滚动加载计时器
   function onScroll(){//滚动加载
      clearTimeout(waterfall._scrollTimer);
	  waterfall._scrollTimer=setTimeout(function(){
	      var $lowest_column=waterfall.$columns.eq(calculateLowest());//最短列
		  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
		  var scrollTop=document.documentElement.scrollTop||document.body.scrollTop||0;//滚动条距离
		  var windowHeight=document.documentElement.clientHeight||document.body.clientHeight||0;//窗口高度
		  if(scrollTop>=bottom-windowHeight){
			 render(getElements(),true);
		  }
	  },100);
   }
   function onResize(){//窗口缩放时重新排列
      if(calculateColumns()==waterfall.column_num) return; //列数未改变，不需要重排
      var $cells=waterfall.$waterfall.find(setting.cell_selector);
	  waterfall.$columns.remove();
	  waterfall.$columns=creatColumn();
      render($cells,false); //重排已有元素时强制不渐显
   }
})(jQuery);