js 客户端验证文件类型,获取图片信息 ...
时间：2010-08-08 来源：zalion
<!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=gb2312" /> <title>JS 文件大小及类型判断</title> <mce:style><!-- *{}{ font-size:12px;} --></mce:style><style mce_bogus="1">*{}{ font-size:12px;}</style> <mce:script language="javascript"><!-- function ShowInfo(sUrl) { var FSO,F,Ext; var Extlist = ".gif.jpg.bmp"; //FSO = new ActiveXObject("Scripting.FileSystemObject"); //F = FSO.GetFile(sUrl); Ext = GetExt(sUrl); if(Extlist.indexOf(Ext)==-1) document.getElementById("Info").innerHTML = "扩展名：" + Ext + " 不是图片类型! 原始路径：" + sUrl; else{ document.getElementById("imgs").src = ""; document.getElementById("imgs").alt = "图片加载中……"; document.getElementById("imgs").src = sUrl; var MyImage = new Image(); MyImage.src = sUrl; document.getElementById("Info").innerHTML = "扩展名：" + Ext + " 合法图片类型! 原始路径：" + sUrl + "<br /> 文件大小：" + MyImage.fileSize + " Bytes 尺寸：" + MyImage.width + "*" + MyImage.height; } } function GetExt(sUrl) { var arrList = sUrl.split("."); return arrList[arrList.length-1]; } function DrawImage(ImgD,w,h) { var flag = false; var MyImage = new Image(); MyImage.src = ImgD.src; if(MyImage.readyState != "complete"){ return false; //确保图片完全加载 } if(MyImage.width > 0 && MyImage.height > 0){ flag = true; if(MyImage.width / MyImage.height >= w / h){ if(MyImage.width > w){ ImgD.width = w; ImgD.height = (MyImage.height * w) / MyImage.width; }else{ ImgD.width = MyImage.width; ImgD.height = MyImage.height; } ImgD.alt = "原始尺寸：" + MyImage.width + "x" + MyImage.height; }else{ if(MyImage.height > h){ ImgD.height = h; ImgD.width = (MyImage.width * h) / MyImage.height; }else{ ImgD.width = MyImage.width; ImgD.height = MyImage.height; } ImgD.alt = "原始尺寸：" + MyImage.width + "x" + MyImage.height; } } } function zoomimg(img) { var zoom=parseInt(img.style.zoom,10) || 100; zoom += event.wheelDelta / 24; imgW = img.clientWidth*zoom/100; if (zoom>10) img.style.zoom = zoom + "%"; return false; } // --></mce:script> </head> <body> <form id="form1" name="form1" enctype="multipart/form-data" method="post" action=""> <p> <input name="ofile" type="file" id="ofile" onchange="ShowInfo(this.value);" /> </p> <p id="Info"></p> <p><img src="#" mce_src="#" id="imgs" width="300" height="300" onmousewheel="return zoomimg(this)" onload="DrawImage(this,300,300)" /></p> </form> </body> </html>
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