拖动条改变图片大小

2009-11-24 按钮表单 ℃

<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv=Content-Type content="text/html;charset=gb2312">
<title>拖动条改变图片大小</title>
<style>
*{margin:0;padding:0;font-size:12px;}
.btn{width:50px;height:15px;cursor:pointer;}
#picViewPanel{margin:5 50 0 50px; width:278px; height:200px;overflow:auto;text-align:center;border:solid 1px #cccccc;}
#slider{margin:0 50px;height:15px;width:278px;border:1px solid #000000;position:relative;}
#sliderLeft{height:13px; width:13px;float:left;border:1px solid #cccccc;cursor:pointer;}
#sliderBlock{height:13px;width:50px;border:1px solid #cccccc;position:absolute;top:0;left:113px;cursor:pointer;background:#cccccc;text-align:center;}
#sliderRight{height:13px;width:13px;float:right;border:1px solid #cccccc;cursor:pointer;}
</style>
</head>
<body>
<div id="picViewPanel"></div>
<div id="slider">
<span id="sliderLeft" ><<</span>
<span id="sliderRight">>></span>
<span id="sliderBlock">==</span>
</div>
</body>
<script>
//golbal
var pv = null;
var sd = null;
window.onload=function(){
  pv = new PicView("/images/logo.gif"); 
  sd = new Slider(
  function(p){
     document.getElementById("sliderBlock").innerHTML = 2*p +"%";
          pv.expand(2*p/100);
        },function(){});
}
var PicView = function(url,alt){
  this.url=url;
  this.obj=null;
  this.alt=alt?alt:"";
  this.realWidth=null;
  this.realHeight=null;
  this.zoom=1;
  this.init();
} 
PicView.prototype.init=function(){
  var _img=document.createElement("img");
  _img.src = this.url; 
  _img.alt = this.alt;
  _img.style.zoom = this.zoom;  
  document.getElementById("picViewPanel").appendChild(_img);
  this.obj=_img;
  this.realWidth=_img.offsetWidth;  
  this.realHeight=_img.offsetHeight;
}
PicView.prototype.reBind=function(){  
  this.obj.style.width =  this.realWidth*this.zoom+"px";
  this.obj.style.height = this.realHeight*this.zoom+"px";
  //this.obj.style.zoom = this.zoom; 
}
PicView.prototype.expand=function(n){   
  this.zoom=n;
  this.reBind(); 
}
var Slider = function(ing,ed){
  this.block=document.getElementById("sliderBlock"); 
  this.percent = 0;
  this.value = 0;
  this.ing = ing;
  this.ed = ed;
  this.init();
}
Slider.prototype.init=function(){
  var _sx=0;
  var _cx=0;
  var o=this.block;
  var me=this;
  o.onmousedown=function(e){
 var e=window.event||e;
        _sx = o.offsetLeft;
        _cx = e.clientX-_sx;
        document.body.onmousemove=move;
        document.body.onmouseup=up; 
  };
  function move(e){
 var e=window.event||e;
        var pos_x = e.clientX - _cx;
    pos_x=pos_x<13?13:pos_x;
 pos_x=pos_x>248+15-50?248+15-50:pos_x;
        o.style.left =  pos_x+"px";
   me.percent=(pos_x-13)/2;
        me.ing(me.percent);        
  }
  function up(){
 document.body.onmousemove=function(){};
        document.body.onmouseup=function(){}; 
  }
}
</script>
</html>

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