<!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" >
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
<title>本地图片预览</title>
<style type="text/css">
#preview{width:100px;height:100px;border:1px solid #000;overflow:hidden;}
#imghead {filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);}
</style>
</head>
<body>
<div id="preview">
<img id="imghead" width="100" height="100" border="0" src='../images/demo.jpg'><!--无
预览时的默认图像，自己弄一个-->
</div>
<div id='preview1'>
<img id="imghead1" width="100" height="100" border="0" src='../images/demo.jpg'>
</div>
<br/>
<br/>
<input type="file" id='up' />
<script type="text/javascript">
function previewImage(file,oImg)
{
var oImg1=document.getElementById(oImg);
var MAXWIDTH = 100;
var MAXHEIGHT = 100;
var div = document.getElementById('preview');
if (file.files && file.files[0])
{
div.innerHTML = '<img id=imghead>';
var img = document.getElementById('imghead');
img.onload = function(){
var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth,
img.offsetHeight);
img.width = rect.width;
img.height = rect.height;
img.style.marginLeft = rect.left+'px';
img.style.marginTop = rect.top+'px';
}
var reader = new FileReader();
reader.onload = function(evt){img.src = evt.target.result;
}
reader.readAsDataURL(file.files[0]);
var timer=setTimeout(function(){
console.log(img.src);
oImg1.src=img.src;
},1000);
}
else
{
var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader
(sizingMethod=scale,src="';
file.select();
//var src = document.selection.createRange().text;、
var src = this.ownerDocument.selection.CreateRange().text
console.log(src);
div.innerHTML = '<img id=imghead>';
var img = document.getElementById('imghead');
img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
//console.log(sFilter+'<br>'+src+'<br>'+img+"<br>"+rect);
status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height
+"px;margin-top:"+rect.top+"px;margin-left:"+rect.left+"px;"+sFilter+src+"\"'></div>";
var timer=setTimeout(function(){
oImg1.src=src;
},1000);
}
}
function clacImgZoomParam( maxWidth, maxHeight, width, height ){
var param = {top:0, left:0, width:width, height:height};
if( width>maxWidth || height>maxHeight )
{
rateWidth = width / maxWidth;
rateHeight = height / maxHeight;
if( rateWidth > rateHeight )
{
param.width = maxWidth;
param.height = Math.round(height / rateWidth);
}else
{
param.width = Math.round(width / rateHeight);
param.height = maxHeight;
}
}
param.left = Math.round((maxWidth - param.width) / 2);
param.top = Math.round((maxHeight - param.height) / 2);
return param;
}
window.onload=function()
{
var oUp = document.getElementById('up');
//var imghead1 = document.getElementById('imghead1');
oUp.onchange=function()
{
previewImage(this,'imghead1');
}
}
</script>
</body>
</html>
