JavaScript 无缝上下左右滚动加定高定宽停顿效果


根据无缝滚动和八向滚动修改而来,特点是能同一程序中分别向四个方向移动。

  对滚动框内的样式设置有些要求。

  效果:http://www.cnblogs.com/cloudgamer/archive/2008/04/30/1177682.html

  代码:

<!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 oThis = this, oScroller = $(idScroller), oScrollMid = $(idScrollMid);
  
  this.SetOptions(options);
  this.Side = this.options.Side || ["up"];//方向
  this.scroller = oScroller;      //对象
  this.speed = this.options.Speed;  //速度
  this.timer = null;          //时间
  this.pauseHeight = 0;        //定高
  this.pauseWidth = 0;        //定宽
  this.pause = 0;            //定高(宽)
  this.side = 0;            //参数
  
  //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));
  oScrollMid.appendChild(oScrollMid.cloneNode(true));
  
  addEventHandler(oScroller, "mouseover", function() { oThis.Stop(); });
  addEventHandler(oScroller, "mouseout", function() { oThis.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
   //当上下和左右一起使用时必须设置PauseHeight和PauseWidth来设置转向位置
   PauseStep:  1000//停顿时间(PauseHeight或PauseWidth大于0该参数才有效)
  };
  Object.extend(this.options, options || {});
 },
 //转向
 Turn: function() {
  //通过设置方向数组的排列来转向
  this.Side.push(this.Side.shift().toLowerCase());
 },
 //上下滚动
 ScrollUpDown: function() {
  this.pause = this.pauseHeight;
  this.scroller.scrollTop = this.GetScroll(this.scroller.scrollTop, this.heightScroller, this.heightList, this.options.PauseHeight);
  this.pauseHeight = this.pause;
  
  var oThis = this;
  this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
 },
 //左右滚动
 ScrollLeftRight: function() {
  this.pause = this.pauseWidth;
  //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);
  this.pauseWidth = this.pause;
  
  var oThis = this;
  this.timer = window.setTimeout(function(){ oThis.Start(); }, this.speed);
 },
 //获取设置滚动数据
 GetScroll: function(iScroll, iScroller, iList, iPause) {
  var 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; this.Turn();
    } else {
      this.pause += iStep;
    }
  }
  
  return (iScroll + iStep);
 },
 //开始
 Start: function() {  
  //方向设置
  switch (this.Side[0].toLowerCase()) {
    case "right" :
      if(this.widthList < this.widthScroller) return;
      this.side = -1;
      this.ScrollLeftRight();
      break;
    case "left" :
      if(this.widthList < this.widthScroller) return;
      this.side = 1;
      this.ScrollLeftRight();
      break;
    case "down" :
      if(this.heightList < this.heightScroller) return;
      this.side = -1;
      this.ScrollUpDown();
      break;
    case "up" :
    default :
      if(this.heightList < this.heightScroller) return;
      this.side = 1;
      this.ScrollUpDown();
  }
 },
 //停止
 Stop: function() {
  clearTimeout(this.timer);
 }
};
  
window.onload = function(){
  new Scroller("idScroller", "idScrollMid",{ Side:["up","left"], PauseHeight:50, PauseWidth:400 });
}
</script>
<style>
.Scroller {}{line-height:50px; border:1px solid #000000; padding:0px 10px; height:50px; width:400px;}
.Scroller *{}{margin:0px; padding:0px;}
.ScrollMid {}{float:left;}
.ScrollMid ul{}{width:800px;float:left;}
.ScrollMid li{}{list-style:none; float:left; width:390px; padding-left:10px;}
</style>
<div id="idScroller" class="Scroller" style="width:400px; height:50px;">
 <div style="width:1600px">
  <div id="idScrollMid" class="ScrollMid">
   <ul>
    <li>111111111111</li>
    <li>2222222222222</li>
    <li>333333333333333</li>
    <li>4444444444444</li>
   </ul>
  </div>
 </div>
</div>
<div id="test"></div>
</body>
</html>



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