Javascript教程_Lazyload 延迟加载效果源码教程_Javascript教程_H5之家

Javascript教程_Lazyload 延迟加载效果源码教程

Lazyload是通过延迟加载来实现按需加载，达到节省资源，加快浏览速度的目的。
网上也有不少类似的效果，这个Lazyload主要特点是：
支持使用window（窗口）或元素作为容器对象；
对静态（位置大小不变）元素做了大量的优化；
支持垂直、水平或同时两个方向的延迟。
由于内容比较多，下一篇再介绍图片延迟加载效果。
兼容：ie6/7/8, firefox 3.5.5, opera 10.10, safari 4.0.4, chrome 3.0

<!DOCTYPE html>
<html xmlns="">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>延迟加载效果</title>
<script>
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<script>
var LazyLoad = function(elems, options) {
//初始化程序
this._initialize(elems, options);
//初始化container
this._initContainer();
//如果没有元素就退出
if ( this.isFinish() ) return;
//初始化模式设置
this._initMode();
//进行第一次触发
this.resize(true);
};
LazyLoad.prototype = {
//初始化程序
_initialize: function(elems, options) {
this._elems = elems;//加载元素集合
this._rect = {};//容器位置参数对象
this._range = {};//加载范围参数对象
this._loadData = null;//加载程序
this._timer = null;//定时器
this._lock = false;//延时锁定
//静态使用属性
this._index = 0;//记录索引
this._direction = 0;//记录方向
this._lastScroll = { "left": 0, "top": 0 };//记录滚动值
this._setElems = function(){};//重置元素集合程序

var opt = this._setOptions(options);

this.delay = opt.delay;
this.threshold = opt.threshold;
this.beforeLoad = opt.beforeLoad;

this._onLoadData = opt.onLoadData;
},
//设置默认属性
_setOptions: function(options) {
    this.options = {//默认值
  container: window,//容器
  mode:  "dynamic",//模式
  threshold: 0,//加载范围阈值
  delay:  100,//延时时间
  beforeLoad: function(){},//加载前执行
  onLoadData: function(){}//显示加载数据
    };
    return $$.extend(this.options, options || {});
},
//初始化容器设置
_initContainer: function() {
var container = $$(this.options.container),
  isWindow = container == window || container == document
    || !container.tagName || (/^(?:body|html)$/i).test( container.tagName );
if ( isWindow ) {
  var doc = document;
  container = doc.compatMode == 'CSS1Compat' ? doc.documentElement : doc.body;
}
//定义执行方法
var oThis = this, width = 0, height = 0;
this.load = $$F.bind( this._load, this );
this.resize = $$F.bind( this._resize, this );
this.delayLoad = function() { oThis._delay( oThis.load ); };
this.delayResize = function(){//防止重复触发bug
  var clientWidth = container.clientWidth,
   clientHeight = container.clientHeight;
  if( clientWidth != width || clientHeight != height ) {
   width = clientWidth; height = clientHeight;
   oThis._delay( oThis.resize );
  }
};
//记录绑定元素方便移除
this._binder = isWindow ? window : container;
//绑定事件
$$E.addEvent( this._binder, "scroll", this.delayLoad );
isWindow && $$E.addEvent( this._binder, "resize", this.delayResize );
//获取容器位置参数函数
this._getContainerRect = isWindow && ( "innerHeight" in window )
  ? function(){ return {
    "left": 0, "right": window.innerWidth,
    "top": 0, "bottom":window.innerHeight
   }}
  : function(){ return oThis._getRect(container); } ;
//设置获取scroll值函数
this._getScroll = isWindow
  ? function() { return {
    "left": $$D.getScrollLeft(), "top": $$D.getScrollTop()
   }}
  : function() { return {
    "left": container.scrollLeft, "top": container.scrollTop
   }};
},
//初始化模式设置
_initMode: function() {
switch ( this.options.mode.toLowerCase() ) {
  case "vertical" ://垂直方向
   this._initStatic( "vertical", "vertical" );
   break;
  case "horizontal" ://水平方向
   this._initStatic( "horizontal", "horizontal" );
   break;
  case "cross" :
  case "cross-vertical" ://垂直正交方向
   this._initStatic( "cross", "vertical" );
   break;
  case "cross-horizontal" ://水平正交方向
   this._initStatic( "cross", "horizontal" );
   break;
  case "dynamic" ://动态加载
  default :
   this._loadData = this._loadDynamic;
}
},
//初始化静态加载设置
_initStatic: function(mode, direction) {
//设置模式
var isVertical = direction == "vertical";
if ( mode == "cross" ) {
  this._crossDirection = $$F.bind( this._getCrossDirection, this,
   isVertical ? "_verticalDirection" : "_horizontalDirection",
   isVertical ? "_horizontalDirection" : "_verticalDirection" );
}
//设置元素
var pos = isVertical ? "top" : "left",
  sortFunction = function( x, y ) { return x._rect[ pos ] - y._rect[ pos ]; },
  getRect = function( elem ) { elem._rect = this._getRect(elem); return elem; };
this._setElems = function() {//转换数组并排序
  this._elems = $$A.map( this._elems, getRect, this ).sort( sortFunction );
};
//设置加载函数
this._loadData = $$F.bind( this._loadStatic, this,
  "_" + mode + "Direction",
  $$F.bind( this._outofRange, this, mode, "_" + direction + "BeforeRange" ),
  $$F.bind( this._outofRange, this, mode, "_" + direction + "AfterRange" ) );
},
//延时程序
_delay: function(run) {
clearTimeout(this._timer);
if ( this.isFinish() ) return;
var oThis = this, delay = this.delay;
if ( this._lock ) {//防止连续触发
  this._timer = setTimeout( function(){ oThis._delay(run); }, delay );
} else {
  this._lock = true; run();
  setTimeout( function(){ oThis._lock = false; }, delay );
}
},
//重置范围参数并加载数据
_resize: function(change) {
if ( this.isFinish() ) return;
this._rect = this._getContainerRect();
//位置改变的话需要重置元素位置
if ( change ) { this._setElems(); }
this._load(true);
},
//加载程序
_load: function(force) {
if ( this.isFinish() ) return;
var rect = this._rect, scroll = this._getScroll(),
  left = scroll.left, top = scroll.top,
  threshold = Math.max( 0, this.threshold | 0 );
//记录原始加载范围参数
this._range = {
  top: rect.top + top - threshold,
  bottom: rect.bottom + top + threshold,
  left: rect.left + left - threshold,
  right: rect.right + left + threshold
}
//加载数据
this.beforeLoad();
this._loadData(force);
},
//动态加载程序
_loadDynamic: function() {
this._elems = $$A.filter( this._elems, function( elem ) {
   return !this._insideRange( elem );
  }, this );
},
//静态加载程序
_loadStatic: function(direction, beforeRange, afterRange, force) {
//获取方向
direction = this[ direction ]( force );
if ( !direction ) return;
//根据方向历遍图片对象
var elems = this._elems, i = this._index,
  begin = [], middle = [], end = [];
if ( direction > 0 ) {//向后滚动
  begin = elems.slice( 0, i );
  for ( var len = elems.length ; i < len; i++ ) {
   if ( afterRange( middle, elems[i] ) ) {
    end = elems.slice( i + 1 ); break;
   }
  }
  i = begin.length + middle.length - 1;
} else {//向前滚动
  end = elems.slice( i + 1 );
  for ( ; i >= 0; i-- ) {
   if ( beforeRange( middle, elems[i] ) ) {
    begin = elems.slice( 0, i ); break;
   }
  }
  middle.reverse();
}
this._index = Math.max( 0, i );
this._elems = begin.concat( middle, end );
},
//垂直和水平滚动方向获取程序
_verticalDirection: function(force) {
   return this._getDirection( force, "top" );
},
_horizontalDirection: function(force) {
   return this._getDirection( force, "left" );
},
//滚动方向获取程序
_getDirection: function(force, scroll) {
var now = this._getScroll()[ scroll ], _scroll = this._lastScroll;
if ( force ) { _scroll[ scroll ] = now; this._index = 0; return 1; }
var old = _scroll[ scroll ]; _scroll[ scroll ] = now;
return now - old;
},
//cross滚动方向获取程序
_getCrossDirection: function(primary, secondary, force) {
var direction;
if ( !force ) {
  direction = this[ primary ]();
  secondary = this[ secondary ]();
  if ( !direction && !secondary ) {//无滚动
   return 0;
  } else if ( !direction ) {//次方向滚动
   if ( this._direction ) {
    direction = -this._direction;//用上一次的相反方向
   } else {
    force = true;//没有记录过方向
   }
  } else if ( secondary && direction * this._direction >= 0 ) {
   force = true;//同时滚动并且方向跟上一次滚动相同
  }
}
if ( force ) {
  this._lastScroll = this._getScroll(); this._index = 0; direction = 1;
}
return ( this._direction = direction );
},
//判断是否加载范围内
_insideRange: function(elem, mode) {
var range = this._range, rect = elem._rect || this._getRect(elem),
  insideH = rect.right >= range.left && rect.left <= range.right,
  insideV = rect.bottom >= range.top && rect.top <= range.bottom,
  inside = {
    "horizontal": insideH,
    "vertical":  insideV,
    "cross":  insideH && insideV
   }[ mode || "cross" ];
//在加载范围内加载数据
if ( inside ) { this._onLoadData(elem); }
return inside;
},
//判断是否超过加载范围
_outofRange: function(mode, compare, middle, elem) {
if ( !this._insideRange( elem, mode ) ) {
  middle.push(elem);
  return this[ compare ]( elem._rect );
}
},
_horizontalBeforeRange: function(rect) { return rect.right < this._range.left; },
_horizontalAfterRange: function(rect) { return rect.left > this._range.right; },
_verticalBeforeRange: function(rect) { return rect.bottom < this._range.top; },
_verticalAfterRange: function(rect) { return rect.top > this._range.bottom; },
//获取位置参数
_getRect: function(node) {
var n = node, left = 0, top = 0;
while (n) { left += n.offsetLeft; top += n.offsetTop; n = n.offsetParent; };
return {
  "left": left, "right": left + node.offsetWidth,
  "top": top, "bottom": top + node.offsetHeight
};
},
//是否完成加载
isFinish: function() {
if ( !this._elems || !this._elems.length ) {
  this.dispose(); return true;
} else {
  return false;
}
},
//销毁程序
dispose: function(load) {
clearTimeout(this._timer);
if ( this._elems || this._binder ) {
  //加载全部元素
  if ( load && this._elems ) {
   $$A.forEach( this._elems, this._onLoadData, this );
  }
  //清除关联
  $$E.removeEvent( this._binder, "scroll", this.delayLoad );
  $$E.removeEvent( this._binder, "resize", this.delayResize );
  this._elems = this._binder = null;
}
}
}
</script>
</head>
<body>
<style>
.lazy{ width:600px;overflow:scroll;border:1px solid #ccc;}
.lazy table{border-collapse:collapse;}
.lazy td{border:1px solid #ccc;text-align:center;padding:20px;background:#FFF;}
#idLazyContainer{height:250px;*position:relative;}
#idLazyContainer table{position:relative;}
#idLazyContainer div{width:140px;height:100px;line-height:100px;position:relative;}
</style>
模式：
<select id="idMode">
<option value="cross-vertical">垂直正交方向</option>
<option value="cross-horizontal">水平正交方向</option>
<option value="vertical">垂直方向</option>
<option value="horizontal">水平方向</option>
<option value="dynamic">动态加载</option>
</select>
阈值：
<input id="idRange" type="text" size="5" maxlength="3">
<input id="idReset" type="button" value="重新开始">
<input id="idRandom" type="button" value="随机位置">
<input id="idWindow" type="button" value="窗口模式">
<div class="lazy" id="idLazyContainer">
<table cellspacing="0" cellpadding="0">
  <tbody id="idLazy">
  </tbody>
</table>
</div>
<script>
function Lazy(lazycontainer, random){
var table = $$("idLazy"), totalX = 10, totalY = 10, i = 0,
  container = $$("idLazyContainer"), color = [1,1,1];
lazycontainer = lazycontainer || container;
while(table.firstChild){ table.removeChild(table.firstChild); }
for ( var n = 0; n < totalY; n++ ) {
  var row = table.appendChild(document.createElement("tr"));
  for ( var m = 0; m < totalX; m++ ) {
   if ( random ) {
    var css = "style='" + $$A.map(["left", "top"], function(style){
      return style + ":" + (Math.floor(Math.random() * 100) - 50) + "px;";
     }).join("") + "'";
   }
   row.appendChild(document.createElement("td")).innerHTML = "<div " + css + "></div>";
  }
};
setTimeout(function(){//ie6渲染bug
  var lazy = new LazyLoad( container.getElementsByTagName("div"), {
    container: lazycontainer || container,
    mode: $$("idMode").value,
    threshold: $$("idRange").value | 0,
    beforeLoad: function() {
     color = $$A.map(color, function(){ return Math.floor((Math.random() * 255)); });
    },
    onLoadData: function(elem) {
     elem.innerHTML = "第 " + ++i + " 个加载";
     elem.style.backgroundColor = "rgb(" + color.join(",") + ")";
     elem.style.color = "rgb(" + $$A.map(color, function(x){ return 255 - x; } ).join(",") + ")";
    }
   });
  $$("idReset").onclick = function(){
   lazy.dispose(); Lazy(lazycontainer, random);
  }
  var style = container.style;
  $$("idWindow").onclick = function(){
   if( this.value == "窗口模式" ){
    lazy.dispose();
    if ( $$B.ie6 ) {
     container.scrollTop = container.scrollLeft = 0;
     style.overflow = "hidden"; style.position = "static";
    } else {
     style.overflow = "visible";
    }
    Lazy(window, random);
    this.value = "容器模式"
   }else{
    lazy.dispose();
    if ( $$B.ie6 ) {
     style.position = "relative";
    }
    style.overflow = "scroll";
    Lazy(container, random);
    this.value = "窗口模式";
   }
  }
  $$("idRandom").onclick = function(){
   if( this.value == "随机位置" ){
    lazy.dispose(); Lazy(lazycontainer, true);
    this.value = "固定位置"
   }else{
    lazy.dispose(); Lazy(lazycontainer, false);
    this.value = "随机位置";
   }
  }
},0);
}
Lazy();
</script>
<br>
<style>
#idLazyContainer2{height:200px;}
#idLazyContainer2 div{width:140px;height:100px;line-height:25px;}
#idLazyContainer2 textarea{display:none;}
</style>
利用textarea加载数据：
<input id="idReset2" type="button" value="重新开始">
<div class="lazy" id="idLazyContainer2">
<table cellspacing="0" cellpadding="0">
  <tr>
   <td><div>
     <textarea><b><a href="">图片滑动切换效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">图片切割效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">图片变换效果(ie only)</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">仿LightBox内容显示效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">图片滑动展示效果</a></b></textarea>
    </div></td>
  </tr>
  <tr>
   <td><div>
     <textarea><b><a href="">仿163网盘无刷新多文件上传系统</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">拖放效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">滑动条效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">Table排序</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">图片切割系统</a></b></textarea>
    </div></td>
  </tr>
  <tr>
   <td><div>
     <textarea><b><a href="">拖拉缩放效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">Tween算法及缓动效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">颜色梯度和渐变效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">blog式日历控件</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">渐变效果</a></b></textarea>
    </div></td>
  </tr>
  <tr>
   <td><div>
     <textarea><b><a href="">Table行定位效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">多级联动浮动菜单</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">浮动定位提示效果</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">简便无刷新文件上传系统</a></b></textarea>
    </div></td>
   <td><div>
     <textarea><b><a href="">图片上传预览效果</a></b></textarea>
    </div></td>
  </tr>
</table>
</div>
<script>
var container = $$("idLazyContainer2"), lazyTable = container.innerHTML;
lazyTable = lazyTable.replace(/<div>/ig, '<div><img src="" />');
function Lazy2(){
container.innerHTML = lazyTable;
var elems = $$A.map( container.getElementsByTagName("textarea"), function(area){ return area.parentNode; }),
  lazy = new LazyLoad( elems, {
   container: container, mode: "cross",
   onLoadData: function(elem) {
    elem.innerHTML = elem.getElementsByTagName("textarea")[0].value;
   }
  });
$$("idReset2").onclick = function(){ lazy.dispose(); Lazy2(); }
}
Lazy2()
</script>
</body>
</html>