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JavaScript 无缝上下(左右)滚动加定高(定宽)停顿效果

 2010-09-14 13:27:39 来源:WEB开发网   
核心提示:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmln

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 无缝上下(左右)滚动加定高(定宽)停顿效果(兼容ie/ff)</title>
</head>
<body>
<script type="text/javascript">
var $ = function (id) {
  return "string" == typeof id ? document.getElementById(id) : id;
};
  
var Class = {
 create: function() {
  return function() {
   this.initialize.apply(this, arguments);
  }
 }
}
  
Object.extend = function(destination, source) {
  for (var property in source) {
    destination[property] = source[property];
  }
  return destination;
}
  
function addEventHandler(oTarget, sEventType, fnHandler) {
  if (oTarget.addEventListener) {
    oTarget.addEventListener(sEventType, fnHandler, false);
  } else if (oTarget.attachEvent) {
    oTarget.attachEvent("on" + sEventType, fnHandler);
  } else {
    oTarget["on" + sEventType] = fnHandler;
  }
};
  
var Scroller = Class.create();
Scroller.prototype = {
 initialize: function(idScroller, idScrollMid, options) {
  var oScroll = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);
  
  this.SetOptions(options);
  this.Scroller = oScroller;  
  this.Speed = this.options.Speed;
  this.timer = null;
  this.Pause = 0;
  
  //用于上下滚动
  this.heightScroller = parseInt(oScroller.style.height) || oScroller.offsetHeight;
  this.heightList = oScrollMid.offsetHeight;
  
  //用于左右滚动
  this.widthScroller = parseInt(oScroller.style.width) || oScroller.offsetWidth;
  this.widthList = oScrollMid.offsetWidth;
  
  //js取不到css设置的height和width
  
  oScroller.style.overflow = "hidden";
  oScrollMid.appendChild(oScrollMid.cloneNode(true));
  
  //方向设置
  switch (this.options.Side.toLowerCase()) {
    case "right" :
      if(this.widthList <= this.widthScroller) return;
      this.Scroll = this.ScrollLeftRight;
      this.side = -1;
      break;
    case "left" :
      if(this.widthList <= this.widthScroller) return;
      this.Scroll = this.ScrollLeftRight;
      this.side = 1;
      break;
    case "down" :
      if(this.heightList <= this.heightScroller) return;
      this.Scroll = this.ScrollUpDown;
      this.side = -1;
      break;
    case "up" :
    default :
      if(this.heightList <= this.heightScroller) return;
      this.Scroll = this.ScrollUpDown;
      this.side = 1;
  }
  
  addEventHandler(oScroller, "mouseover", function() { oScroll.Stop(); });
  addEventHandler(oScroller, "mouseout", function() { oScroll.Start(); });
  
  this.Start();
 },
 //设置默认属性
 SetOptions: function(options) {
  this.options = {//默认值
   Step:      1,//每次变化的px量
   Speed:    20,//速度(越大越慢)
   Side:      "up",//滚动方向:"up"是上,"down"是下,"left"是左,"right"是右
   PauseHeight:  0,//隔多高停一次
   PauseWidth:  0,//隔多宽停一次
   PauseStep:  1000//停顿时间(PauseHeight或PauseWidth大于0该参数才有效)
  };
  Object.extend(this.options, options || {});
 }, 
 //上下滚动
 ScrollUpDown: function() {
  this.Scroller.scrollTop = this.GetScroll(this.Scroller.scrollTop, this.heightScroller, this.heightList, this.options.PauseHeight);
  
  var oScroll = this;
  this.timer = window.setTimeout(function(){ oScroll.Scroll(); }, this.Speed);
 },
 //左右滚动
 ScrollLeftRight: function() {
  //document.getElementById("test").innerHTML+=iStep+",";
  //注意:scrollLeft超过1400会自动变回1400 注意长度
  this.Scroller.scrollLeft = this.GetScroll(this.Scroller.scrollLeft, this.widthScroller, this.widthList, this.options.PauseWidth);
  
  var oScroll = this;
  this.timer = window.setTimeout(function(){ oScroll.Scroll(); }, this.Speed);
 },
 //获取设置滚动数据
 GetScroll: function(iScroll, iScroller, iList, iPause) {
  var oScroll = this, iStep = this.options.Step * this.side;
  
  if(this.side > 0){
    if(iScroll >= (iList * 2 - iScroller)){ iScroll -= iList; }
  } else {
    if(iScroll <= 0){ iScroll += iList; }
  }
  
  this.Speed = this.options.Speed;
  if(iPause > 0){
    if(Math.abs(this.Pause) >= iPause){
      this.Speed = this.options.PauseStep; this.Pause = iStep = 0;
    } else {
      this.Pause += iStep;
    }
  }
  
  return (iScroll + iStep);
 },
 //开始
 Start: function() {
  this.Scroll();
 },
 //停止
 Stop: function() {
  clearTimeout(this.timer);
 }
};
  
window.onload = function(){
  new Scroller("idScroller", "idScrollMid",{ Side:"up", PauseHeight:25 });
  new Scroller("idScroller1", "idScrollMid1",{ Side:"right", PauseWidth:250, Speed:10 });
}
</script>
<style>
.Scroller *{}{margin:0px; padding:0px;}
.Scroller {}{line-height:25px;overflow:hidden; border:1px solid #000000;}
  
#idScrollMid ul{}{width:500px;}
#idScrollMid li{}{width:250px;float:left; overflow:hidden; list-style:none;}
  
#idScrollMid1 {}{float:left;}
#idScrollMid1 ul{}{width:250px;float:left;overflow:hidden;}
#idScrollMid1 li{}{list-style:none;}
</style>
<div id="idScroller" class="Scroller" style="width:500px; height:50px;">
 <div id="idScrollMid">
  <ul>
   <li><a href="http://shundebk.cn/">111111111111111111111</a></li>
   <li><a href="http://shundebk.cn/">211111111111111111111</a></li>
   <li><a href="http://shundebk.cn/">311111111111111111111</a></li>
   <li><a href="http://shundebk.cn/">411111111111111111111</a></li>
   <li><a href="http://shundebk.cn/">511111111111111111111</a></li>
   <li><a href="http://shundebk.cn/">611111111111111111111</a></li>
  </ul>
  <div style="clear:both;"></div>
 </div>
</div>
<br />
<br />
<br />
<div id="idScroller1" class="Scroller" style="width:500px; height:50px;">
 <div style="width:2000px">
  <div id="idScrollMid1">
   <ul>
    <li> <a href="http://shundebk.cn/">1111111111111111111111</a></li>
    <li> <a href="http://shundebk.cn/">2111111111111111111111</a></li>
   </ul>
   <ul>
    <li> <a href="http://shundebk.cn/">1211111111111111111111</a></li>
    <li> <a href="http://shundebk.cn/">2211111111111111111111</a></li>
   </ul>
   <ul>
    <li> <a href="http://shundebk.cn/">1311111111111111111111</a></li>
    <li> <a href="http://shundebk.cn/">2311111111111111111111</a></li>
   </ul>
  </div>
 </div>
</div>
<div id="test"></div>
</body>
</html>

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Tags:JavaScript 无缝 上下

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