div と Canvas_html/css_WEB-ITnose の問題-htmlチュートリアル-php.cn

div と Canvas_html/css_WEB-ITnose の問題

WBOY

リリース： 2016-06-21 09:28:33

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  <!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{width: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='width:"+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: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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