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ASPX: FileUpload limit IN ADVANCE the size and type of files.
Posted on 2014-02-19
Dear experts
I’m relative new to ASPX. I have a page on which a user could upload a file. I want to limit the user by type /image/ and by size (3 MB), but I want do this BEFORE the user post the file. I use a standard FileUpload control, not upload the file in additional page, I upload it on the main Submit button - look the page:
http://demo.asp2.eu/Register_bMA.aspx?langID=EN
I put a code in my Submit button for that purpose, but it look when the user select a big file the code AT all do not goes here – it get server error message. I want to stop user BEFORE he start uploading file with 200 MB by mistake /there is change for such mistake, no body read the message what should be uploaded here and it may start upload video file. /
I’m relative new to ASPX. I have a page on which a user could upload a file. I want to limit the user by type /image/ and by size (3 MB), but I want do this BEFORE the user post the file. I use a standard FileUpload control, not upload the file in additional page, I upload it on the main Submit button - look the page:
http://demo.asp2.eu/Register_bMA.aspx?langID=EN
I put a code in my Submit button for that purpose, but it look when the user select a big file the code AT all do not goes here – it get server error message. I want to stop user BEFORE he start uploading file with 200 MB by mistake /there is change for such mistake, no body read the message what should be uploaded here and it may start upload video file. /
[X]
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Hi,
if server error is coming then you have to change web.config file...
<configuration>
<system.web>
<httpRuntime maxRequestLength="SizeHere
</system.web>
</configuration>
"SizeHere" is in KB. The default is 4096 (= 4 MB).
Another solution is:
http://forums.asp.net/t/1099698.aspx
Hope this helps you.
if server error is coming then you have to change web.config file...
<configuration>
<system.web>
<httpRuntime maxRequestLength="SizeHere
</system.web>
</configuration>
"SizeHere" is in KB. The default is 4096 (= 4 MB).
Another solution is:
http://forums.asp.net/t/1099698.aspx
Hope this helps you.
An when I change this, the user will get the message that bigger size is not allowed ? I doublt, i think it simple will make the error, I'm right or not ?
Active 3 days ago
You can check the size using javascript with the following (for IE this will only work with IE10 or above):
this.files[0].size
Active 3 days ago
It works with all browsers. My comment meant that for IE it will only work with 10 and above, all non-IE browsers should be fine.
Or may be to use AJAX FileUpload control or other third part library? Anyway, i use AJAX library ... i want to put a control which to make validation BEFORE real upload of the file. This is common task, how it is usually solved?
To Carl Tawn
It is a possible solution, could you please help me with more detail how to apply it? I have a simple form with Submit button and C# code after it, i think I should replace and first call this JavaFunction, but I need help for right syntacs
<asp:Button CssClass="submit" ID="btnSubmit" runat="server"
ValidationGroup="contact" OnClick="btnSubmit_Click" Height="38px"
Width="118px" />
Also i think it is easy /for you, not for me/ to detect the user browser in this JavaScript function, if it is <than IE10 to turn off the function.
It is a possible solution, could you please help me with more detail how to apply it? I have a simple form with Submit button and C# code after it, i think I should replace and first call this JavaFunction, but I need help for right syntacs
<asp:Button CssClass="submit" ID="btnSubmit" runat="server"
ValidationGroup="contact" OnClick="btnSubmit_Click" Height="38px"
Width="118px" />
Also i think it is easy /for you, not for me/ to detect the user browser in this JavaScript function, if it is <than IE10 to turn off the function.
Hi dvplayltd,
Something like this oughta do the trick for you:
Alan
Something like this oughta do the trick for you:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default7.aspx.vb" Inherits="Default7" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function checkit(obj) {
var FileName = obj.value;
var FileExt = FileName.substr(FileName.lastIndexOf('.') + 1).toLowerCase();
var FileSize = obj.files[0].size;
var FileSizeMB = (FileSize / 1048576).toFixed(2);
if ((FileExt != "jpg" && FileExt != "gif" && FileExt != "png") || FileSize > 3145728) {
var error = "File type : " + FileExt + "\n\n";
error += "Size: " + FileSizeMB + " MB \n\n";
error += "Please make sure your file is in jpg, gif or png format and less than 3 MB.\n\n";
alert(error);
return false;
}
return true;
} </script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" onchange="checkit(this)" />
</div>
</form>
</body>
</html>
Alan
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