How To I Get Upload File Size Using Java Script (Fileupload Control)

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Hi All,
I want to validate an file to be uploaded if size is more then 5 M.B. on button
click event using java script.
Please help me on this.

Thanks in Advance.

Posted 4-Nov-14 19:43pm

kapil0411

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Praneet Nadkar · Answer 1 · 2014-11-04T19:48:00

Solution 1

Hi Kapil,

Let us say that you FileUpload control has id as "FileUpload1".
You can use the following javascript for this:

JavaScript

function validateFileSize() {
      var uploadControl = document.getElementById('<%= FileUpload1.ClientID %>');
      if (uploadControl.files[0].size > 1048576*5) {
          alert('Maximum size allowed is 5 MB');
          return false;
       }
       else {
           return true;
        }
      }

Also, add this to you FileUpload Control,

onchange="validateFileSize();"

Hope this works for you !! :)

Regards,
Praneet

Posted 4-Nov-14 19:48pm

Praneet Nadkar

Updated 4-Nov-14 19:49pm

v2

Comments

[no name] 5-Nov-14 1:51am

Please check the calculation for file size once.

kapil0411 5-Nov-14 2:04am

Hi Praneet,
Thanks for your response.
but i am getting java script error in line :-
if (uploadControl.files[0].size > 1048576*5)

kindly help me on this

[no name] 5-Nov-14 2:06am

use this if (uploadControl.files[0].size > 1048576) {
alert('Maximum size allowed is 1 MB');
return false;
}
This should work
This will be for 1 mb. You can change this as per your needs

kapil0411 5-Nov-14 2:14am

Praneet i am getting error for
"uploadControl.files[0]" it is coming as null.

[no name] 5-Nov-14 2:18am

That code works fine for me. Can u paste your code here ?

kapil0411 5-Nov-14 2:22am

Below is my code.

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<script type="text/javascript" language="javascript">
function validateFileSize() {

var uploadControl = document.getElementById('<%= fileupld1.ClientID %>');
if (uploadControl.files[0].size > 1048576) {
alert('Maximum size allowed is 1 MB');
return false;
}
else {
return true;
}
}

</script>

<asp:FileUpload ID="fileupld1" runat="server" Onchange="return validateFileSize();" />

[no name] 5-Nov-14 2:27am

Change your code to this:
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
<script type="text/javascript">
function validateFileSize() {
var uploadControl = document.getElementById('<%= fileupld1.ClientID %>');
if (uploadControl.files[0].size > 1048576 * 5) {
alert('Maximum size allowed is 5 MB');
return false;
}
else {
return true;
}
}
</script>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:FileUpload ID="fileupld1" runat="server" Onchange="return validateFileSize();" />

[no name] 5-Nov-14 2:28am

try placing your script in header content

kapil0411 5-Nov-14 4:26am

i tried with putting my java script in header content but its giving same error :(