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jsp上传图片即时显示效果代码

添加时间:2013-12-6
    相关阅读: 相关内容
<script>
function setImagePreview() {       
 var docObj=document.getElementById("doc");        
 var imgObjPreview=document.getElementById("preview");
 if(docObj.files && docObj.files[0]){                       
  //火狐下,直接设img属性                       
  imgObjPreview.style.display = 'block';                       
  imgObjPreview.style.width = '300px';                       
  imgObjPreview.style.height = '120px';                                           
  //imgObjPreview.src = docObj.files[0].getAsDataURL();
  //火狐7以上版本不能用上面的getAsDataURL()方式获取,需要一下方式       
  imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
  }else{                       
   //IE下,使用滤镜                       
   docObj.select();                       
   var imgSrc = document.selection.createRange().text;                       
   var localImagId = document.getElementById("localImag");
   //必须设置初始大小                       
   localImagId.style.width = "250px";                       
   localImagId.style.height = "200px";
  //图片异常的捕捉,防止用户修改后缀来伪造图片
  try{                               
   localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";                               
   localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;                       
  }catch(e){                               
   alert("您上传的图片格式不正确,请重新选择!");                               
   return false;                       
  }
   imgObjPreview.style.display = 'none';                       
   document.selection.empty();               
  }               
   return true;       
  }
</script>
<body>
<input type=file name="doc" id="doc" onchange="javascript:setImagePreview();">
<p><div id="localImag"><img id="preview" width=-1 height=-1 style="diplay:none" /></div></p>
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