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  • 图片预览-兼容IE

    直接贴代码吧:

    <!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=utf-8" />
    <title>图片上传本地预览</title>
    <style type="text/css">
    #preview{260px;height:190px;border:1px solid #000;overflow:hidden;}
    #imghead {filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);}
    </style>
    <script type="text/javascript">


    //图片上传预览 IE是用了滤镜。
    function previewImage(file)
    {
    var MAXWIDTH = 260;
    var MAXHEIGHT = 180;
    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]);
    }
    else //兼容IE
    {
    var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
    file.select();
    var src = document.selection.createRange().text;
    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);
    status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
    div.innerHTML = "<div id=divhead style='"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;"+sFilter+src+""'></div>";
    }
    }
    function clacImgZoomParam( maxWidth, maxHeight, width, height ){
    var param = {top:0, left:0, 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;
    }
    </script>
    </head>
    <body>
    <div id="preview">
    <img id="imghead" width="100" height="100" border="0" src='<%=request.getContextPath()%>/images/defaul.jpg'>
    </div>


    <input type="file" onchange="previewImage(this)" />
    </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/jiangxiaobo/p/5240977.html
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