avalonjs制作响应式瀑布流特效_javascript技巧

　 布局不是基于float，也不是基于绝对定位，看最下面的html,css就知道了。也没有满篇烦人的html插入，代码很清爽

function getIndex(index) {
  if (index < 10) {
    index = "00" + index;
  } else if (index < 100) {
    index = "0" + index;
  }
  return index;
}
var $ = function(id) {
  return document.getElementById(id);
};
require([ "avalon-min" ], function(avalon) {
  var waterfall = {
      load_items : null,
      loaded_items:[],
      col_num : 0,// 列数
      waterfall_model : null,
      col_width : 200,
      loaded_num : 0,
      init_num : 0,
      loading : false,
      start:0,
      resizing:false,
      find_shortest_col : function() {
      // 找出最小高度的列
        var a = avalon($('row0')).height(), min_i = 0;
        for ( var i = 1; i < this.col_num; i++) {
          var b = avalon($('row' + i)).height();
          if (b < a) {
            min_i = i;
            a = b;
          }
        }
        return min_i;
      },
      init : function(data) {
        this.load_items = data;
        this.loaded_items=this.loaded_items.concat(data);
        this.waterfall_model = waterfall_model;
        this.col_num = Math.floor(avalon(window).width()
            / this.col_width);
        this.init_num = this.col_num;
        for ( var j = 0; j < this.col_num; j++) {
          waterfall_model.img_list.push([]);
        }
        for ( var j = 0; j < this.col_num; j++) {
         // 第一行图片
          var a={};
          a.src=getIndex(data[j].src);
          a.height=data[j].height;
          a.text=data[j].text;
          waterfall_model.img_list[j].push(a);
        }
        this.start=this.col_num;
      },
      add_item : function(i) {
        var a = this.find_shortest_col();
        var b={};
        var c=this.load_items[this.init_num+i];
        if(c){
          b.src=getIndex(c.src);
          b.height=c.height;
          b.text=c.text;
          waterfall_model.img_list[a].push(b);
        }
      },
      resize_item:function(i){
        //console.log(i);
        var a = this.find_shortest_col();
        var b={};
        var c=this.loaded_items[this.init_num+i];
        if(c){
          b.src=getIndex(c.src);
          b.height=c.height;
          b.text=c.text;
          waterfall_model.img_list[a].push(b);
        }
      }
    };
    var waterfall_model = avalon.define("waterfall",function(vm) {// vm
              vm.img_list = [];
              vm.rendered = function() {// 每次图片加载渲染后执行

                if(waterfall.resizing){
                  if (waterfall.loaded_num+ waterfall.init_num<waterfall.loaded_items.length){
                    waterfall.loaded_num++;
                    waterfall.resize_item(waterfall.loaded_num);
                    //waterfall.start++;
                  }
                }else{

                  if (waterfall.loaded_num + waterfall.init_num <waterfall.load_items.length){
                    waterfall.loaded_num++;
                    waterfall.add_item(waterfall.loaded_num);
                    waterfall.start++;
                  }
                }
              };
    });
  avalon.config({
    debug:false
  });
  avalon.scan();
  function debouncer( func , timeout ) {
      var timeoutID , timeout = timeout || 200;
      return function () {
       var scope = this , args = arguments;
       clearTimeout( timeoutID );
       timeoutID = setTimeout( function () {
         func.apply( scope , Array.prototype.slice.call( args ) );
       } , timeout );
      }
    }
  avalon.post("http://localhost/css/test.php?start=0", function(data) {
  // 加载第一次
    waterfall.init(data);
  }, "json");
  window.onscroll =debouncer( function ( e ) {
    var scrollTop = avalon(window).scrollTop(), windowHeight = avalon(
    window).height(), documentHeight = avalon(document).height();
    if (windowHeight + scrollTop==documentHeight) {
        avalon.post("http://localhost/css/test.php?start="+(waterfall.start), function(data) {
        // 加载第一次
        waterfall.resizing=false;
        waterfall.load_items=data;
        waterfall.loaded_items=waterfall.loaded_items.concat(data);
        waterfall.loaded_num =waterfall.init_num=0;
        waterfall.add_item(0);
        }, "json");
    }
  });
  window.onresize = debouncer( function ( e ) {
    var windowWidth = avalon(window).width(), k = Math
    .floor(windowWidth / 200), detect_left = avalon(
    $('waterFallDetect')).offset().left;
    if (Math.abs(detect_left) >= 199) {
      waterfall.col_num = Math.floor(avalon(window).width()
      / waterfall.col_width);
      waterfall_model.img_list = [];
      for ( var j = 0; j < waterfall.col_num; j++) {
        waterfall_model.img_list.push([]);
      }
      waterfall.resizing=true;
      waterfall.loaded_num =waterfall.init_num=0;
      //waterfall.start=0;
      waterfall.resize_item(0);
    }
  },30) ;
});

html

<div id='wrap' ms-controller="waterfall">
  <ul ms-each-els="img_list" id='wrap_row'>
    <li ms-each-el="els" ms-attr-id='row{{$index}}'
      data-each-rendered='rendered'>
      <p>
        <img
          ms-src="http://cued.xunlei.com/demos/publ/img/P_{{el.src}}.jpg"
          width='192' ms-attr-height='{{el.height}}'> <span>{{el.src}}</span>
      </p>
    </li>
    <li id='waterFallDetect' ms-if='$last'></li>
  </ul>
</div>

css

#wrap ul li {
display: inline-block;
*display: inline;
zoom: 1;
vertical-align: top;
font-size: 16px;
}
#wrap ul li p {
margin: 5px 2.5px;
border: 1px solid red;
min-width: 192px;
min-height: 100px;
}
#wrap span {
display: block;
}
#waterFallDetect {
width: 192px;
height: 100px;
border: 1px solid red;
}

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