Below provide three pages of special effects to judge upload file size Oh, these three methods are now limited file upload size is a better way, you can upload files when the user limit the size of the upload file to judge processing <!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= "HTML; charset=gb2312 "/> <title>js to judge upload file size </title> </head>
<body> Method One
<input type= "File" Name= "File1" onchange= "Showsize (this.value)" > <script language= "Web Effects" > <!-- function showsize (Files) { var fso,f; Fso=new ActiveXObject ("Scripting.FileSystemObject"); F=fso.getfile (files); if (f.size>1024*4) { Alert (f.size+ "bytes"); } } --> </script> method Two JS to determine the size of the upload file
<script type= "text/javascript" function Chksize (strfilename) { try { var maxsize = 100; //definition of allowable file size, KB, please modify as required! var objstream = new ActiveXObject ("ADODB.stream"); objStream.Type = 1; objStream.Open (); objStream.LoadFromFile (strFileName); if (Math.Round (objstream.size/1024) >maxsize) {alert ("Sorry!) The file you selected is "+math.round (objstream.size/1024,2) +" KB n exceeds the limit of the program "+maxsize+" KB! "); Document.form1.reset (); return false; } Else alert ("Can upload"); }catch (e) { alert ("Not supported"); } } </script>< Form name= "Form1" action= "method=" POST " <input type=" file "Name=" Upfile " Onchange= "Chksize (this.value)"/>//method three
<script>
function getfilesize (filename) {
if (document.all) { Window.oldonerror = window.onerror; Window.onerror = function (err) { if Err.indexof (' Utomation ')!=-1) { Alert (' No permissions to access files '); Return true; } else Return false; }; var fso = new ActiveXObject (' Scripting.FileSystemObject ' ; var file = fso.getfile (filename); Window.onerror = window.oldonerror; return file.size; }} </script> </head>
<form name= "FormName" ><input type= "file" name= "filename" ><br> <input type= button "value=" View file byte size "onclick=" alert (GetFileSize (This.form.filename.value)) ><br> </form> JavaScript to determine the size of the client file, JS to determine the size of the upload file, js get file length </body </html>
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