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Can someone help me in getting the size of a file posted in the ASP.Net FileUpload control using javascript..??

Many Thanks,
Posted 1-Nov-12 20:46pm
ryanb31 at 2-Nov-12 16:39pm
As I recall, you can't because JS does not have access to the file system the way you need it to, but you can after it has been uploaded.

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Solution 1

This works 100%
Example to get file size before upload using JQuery
<html xmlns="">
 <title>Get File Size</title>
 <script src="Scripts/jquery-1.7.1.min.js" type="text/javascript" > </script>
 <script type="text/javascript">
 function GetFileSize(fileid) {
 try {
 var fileSize = 0;
 //for IE
 if ($.browser.msie) {
 //before making an object of ActiveXObject,
 //please make sure ActiveX is enabled in your IE browser
 var objFSO = new ActiveXObject("Scripting.FileSystemObject"); var filePath = $("#" + fileid)[0].value;
 var objFile = objFSO.getFile(filePath);
 var fileSize = objFile.size; //size in kb
 fileSize = fileSize / 1048576; //size in mb
 //for FF, Safari, Opeara and Others
 else {
 fileSize = $("#" + fileid)[0].files[0].size //size in kb
 fileSize = fileSize / 1048576; //size in mb
 alert("Uploaded File Size is" + fileSize + "MB");
 catch (e) {
 alert("Error is :" + e);
<form name="upload" action="">
<input type="file" name="fUpload" id="fUpload" />
<input type="button" value="Get File Size" onclick="GetFileSize('fUpload');" />
Example to get file size before upload in Asp.Net using JQuery
<form id="form1" runat="server">
<asp:FileUpload ID="fUpload" runat="server" />
 <asp:Button ID="btnGetSize" runat="server" Text="Button" OnClientClick="GetFileSize('fUpload');" />

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