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JavaScript 无缝上下左右滚动加定高定宽停顿效果

January 11th,2009 14:04:34 Category : Javascript

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来源：cloudgamer

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。

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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