码迷,mamicode.com
首页 > Web开发 > 详细

js本地图片预览

时间:2014-09-24 13:17:36      阅读:251      评论:0      收藏:0      [点我收藏+]

标签:style   blog   http   color   io   os   java   ar   for   

<!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>

 

js本地图片预览

标签:style   blog   http   color   io   os   java   ar   for   

原文地址:http://www.cnblogs.com/elves/p/3990246.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!