JavaScript input type=file Get file size and type restrictions

HTML code:

<input name= "txtname" type= "file" id= "pic" onchange= "LoadImage (This)"/>

JavaScript code:

Function loadimage (IMG)  {            var  filePath = img.value;             Var fileext = filepath.substring (Filepath.lastindexof ("."))                 .tolowercase () ;            if  (!CHECKFILEEXT (FILEEXT))  {                alert (" The file you uploaded is not a picture, please re-upload! ");                 img.value  =  "";                 return;            }             if  (Img.files && img.files[0])  {//                 alert (IMG);//                 alert (Img.files[0])                  alert (' The file size you selected '  +  (Img.files[0]. size / 1024). toFixed (0)  +  "KB");//                 var xx = img.files[0];//                 for  (VAR I IN XX)  {//                     alert (Xx[i])//                 }            } else {                 img.select ();                 var url =  Document.selection.createRange () .text;                 try {                     var fso = new activexobject (" Scripting.FileSystemObject ");                 } catch  (e)  {                     alert (' If you're using IE8 below   Please turn down the security level! ');                 }                 alert ("File Size:"  +  (FSO. GetFile (URL). size / 1024). toFixed (0)  +  "KB");             }        }          function checkfileext (EXT)  {             if  (!ext.match (/.jpg|. Gif|. Png|. bmp/i))  {                 return false;            }             return true;         }

This article is from the "focus area of it elite" blog, so be sure to keep this source http://msuccess.blog.51cto.com/5486886/1636377

JavaScript input type=file Get file size and type restrictions