Building AJAX Enabled File Uploading System with Progress Bar Using ASP.NET 2.0: ASP Alliance

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Building AJAX Enabled File Uploading System with Progress Bar Using ASP.NET 2.0

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by Jesudas Chinnathampi (Das)
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Displaying a "Please Wait …" Message during an Upload

To display the "Please Wait … Message" we need to use the UpdateProgress control. The UpdateProgress control that we will be using for our upload will be as follows:

Listing 4

<asp:UpdateProgress ID="UP" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>
<asp:Label ID="lblWait" runat="server" Text="Please wait.."></asp:Label>
</ProgressTemplate>                          
</asp:UpdateProgress>

Each time the submit button is clicked the web page will be posted back to the server. You would think that you will see the message, “Please wait.” Well again, we need to look at one more aspect before we can see the “Please wait” message during a file upload.

We need to write a client side JavaScript function that will change the visibility of the UpdateProgress during the post back. The JavaScript will look like:

Listing 5

<script language="javascript" type="text/javascript">
function showWait()
{
    if ($get('myFile').value.length > 0)
    {
        $get('UpdateProgress1').style.display = 'block';
    }
}
</script>

The function showWait will have to be invoked during the form submission. In our scenario that would be the OnClientClick event for the button control.

Listing 6

<asp:Button ID="btnUpload" runat="server" Text="Upload" 
OnClick="UploadFile" OnClientClick="javascript:showWait();"/>

The complete code listing for both AJAX File Upload and Please Wait message is as follows:

<%@ Page Language="C#" AutoEventWireup="true"%>
<html>
<head>
<script runat="server">
protected void UploadFile(object src, EventArgs e)
{
    if (myFile.HasFile)
    {
        string strFileName;
        strFileName = myFile.FileName;
        myFile.PostedFile.SaveAs(Server.MapPath(".") + "//" + strFileName);
    }
}
</script>
 
<script language="javascript" type="text/javascript">
function showWait()
{
    if ($get('myFile').value.length > 0)
    {
        $get('UpdateProgress1').style.display = 'block';
    }
}
</script>
    <title>File Upload</title>
</head>
<body>
<form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server"/>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <Triggers>
            <asp:PostBackTrigger ControlID="btnUpload" /> 
        </Triggers>
        <ContentTemplate>
            <asp:FileUpload ID="myFile" runat="server" />
            <asp:Label ID="lblMsg" runat="server"></asp:Label>            
            <br />
            <asp:Button ID="btnUpload" runat="server" Text="Upload" 
                OnClick="UploadFile" OnClientClick="javascript:showWait();"/>           
            <asp:UpdateProgress ID="UpdateProgress1" runat="server" 
                AssociatedUpdatePanelID="UpdatePanel1">
                <ProgressTemplate>
                    <asp:Label ID="lblWait" runat="server" BackColor="#507CD1" 
                        Font-Bold="True" ForeColor="White" 
                        Text="Please wait ... Uploading file"></asp:Label>
                </ProgressTemplate>
            </asp:UpdateProgress>
        </ContentTemplate>
    </asp:UpdatePanel>
</form>
</body>
</html>

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User Comments

Title: Building AJAX Enabled File Uploading System with Progress Bar Using ASP.NET 2.0
Name: Neeraj k Shrivastwa
Date: 8/6/2008 6:34:51 AM
Comment:
The FileUpload Server Control does not work within the UpdatePanel. Within the updatepanel the HasFile property of FileUpload control always comes false.

Title: Super
Name: MMK
Date: 8/5/2008 5:59:43 AM
Comment:
useful

Title: No Progress Bar
Name: Nic
Date: 7/23/2008 8:12:42 AM
Comment:
There is no progress bar here so the title is even more misleading...

Title: Feedback
Name: Meera
Date: 7/1/2008 2:41:11 AM
Comment:
Can this be done in a user control???

Title: hi
Name: jeni
Date: 6/9/2008 4:10:17 AM
Comment:
its helpfull

Title: Good Code
Name: Naresh
Date: 6/5/2008 9:49:13 PM
Comment:
Very clear saving me from lot of confusion...

Title: PostBackTrigger ???
Name: AL
Date: 5/16/2008 7:11:44 AM
Comment:
What reason put this in UpdatePanel if you use PostBackTrigger? This is full PostBack!

Title: Good Code
Name: Rahi
Date: 5/14/2008 4:56:31 PM
Comment:
Saved me a lot of time...

Title: Have to agree with the new guy
Name: Blake Shadle
Date: 4/10/2008 9:18:53 AM
Comment:
I'm going to have to agree with the new guy on this one. Not exactly the "AJAX" experience that I'm sure everyone hoped for.

Title: error when in UserControl
Name: Exshakto
Date: 4/3/2008 6:03:27 AM
Comment:
Im trying to put this in a asp.net User Control, and im getting an error in the javascript. Where do you think I should put the javascript when its in a user control?

Title: cool
Name: Sudhir T
Date: 3/10/2008 8:07:34 AM
Comment:
Nice post. Simple and beautiful

Title: great!!!!!!!!
Name: sadhana singh
Date: 2/27/2008 9:58:15 PM
Comment:
very nice please keep on pasting more materials it helped me lot thx again!!!!!!!!!

Title: Postback is happening
Name: Nagaraj
Date: 2/1/2008 5:41:17 AM
Comment:
Still postback is happening when we upload file.

Title: The title is misleading!!!
Name: MCM
Date: 1/18/2008 3:10:43 PM
Comment:
This is NOT AJAX. It just doing a full post back. If it's just post back without utilizing any AJAX...why would you need to put it into an update panel?

Title: Very Good Ariticle
Name: Rahul Chauhan
Date: 1/7/2008 1:52:32 AM
Comment:
Plz keep on posting new tutorials on ajax.

Great Job

Title: Good
Name: Rajak Shaik
Date: 12/14/2007 12:06:31 AM
Comment:
Very good article

Title: How to upload the media
Name: Cristiano
Date: 12/12/2007 8:37:19 AM
Comment:
How to upload some media like mp3 songs and picture .jpeg

Title: Need attachment in Sharepoint Designer Form
Name: Kuldeep Singh
Date: 12/10/2007 6:27:55 AM
Comment:
Would you please explain how can i use this code in my Sharepoint Designer custom form????

Title: .NET Programmer
Name: Raj
Date: 12/3/2007 12:13:15 PM
Comment:
Awesome buddy, although simple it made my day today. Superb.

Title: Misleading Title
Name: Haissam Abdul Malak
Date: 11/30/2007 2:11:36 AM
Comment:
The article is explained in a good way, however the content is not related to the title!!

Title: hail to the n00bz
Name: Michael
Date: 11/15/2007 8:00:39 AM
Comment:
Great article, thanks ;)
:) Although I'm using this for my current project:
http://www.aurigma.com/Products/ImageUploader/default.aspx
The price is pretty steep though but it has yummy resize and thumbnailing along with other stuff that I don't need :)

Title: one more developer
Name: Dotnet Coder
Date: 11/14/2007 4:46:45 PM
Comment:
Even though you are using UpdatePanel. It is not actually AJAX, it is posting synchronously all the time.

Title: How to change postedFile?
Name: nice
Date: 11/13/2007 8:33:45 PM
Comment:
How to change (in code) myFile.PostedFile in UploadFile() method? Changing it u can steal any file form client hard drive :-)

Title: good
Name: iraj
Date: 11/13/2007 2:44:49 PM
Comment:
great

Title: URL
Name: JasonJ
Date: 11/13/2007 11:56:48 AM
Comment:
Here is the link.

http://geekswithblogs.net/rashid/archive/2007/08/01/Create-An-Ajax-Style-File-Upload.aspx

Title: Cheating
Name: JasonJ
Date: 11/13/2007 11:55:45 AM
Comment:
This method simply fakes an ajax postback and which might look cool but defeats the whole purpose of the ajax postback. Anyway, here is a link to a page that does it correctly, using an IFrame as Microsoft does in Hotmail.

Title: FileUpload AJAX
Name: Subgurim
Date: 11/13/2007 5:32:20 AM
Comment:
Great, but take a look at the FileUpload AJAX control for ASP.NET hosted on codeplex (http://www.codeplex.com/fileuploadajax)

Title: Update Panel not working in side from view
Name: QuocThinh
Date: 10/8/2007 2:58:54 AM
Comment:
Hi all, I just try your method, but I have a form view all the field will be save to the database, among that, I have fileUrl file that contains the uploads filename, so I must put this upload file inside the form view. But it not working both update panel and update progress, I don't know why.

Title: Not working with gif IE7 solved
Name: lp
Date: 10/4/2007 10:46:25 AM
Comment:
Sorry for the 3rd comment ;-) but I've found solution for IE7 here http://west-wind.com/WebLog/posts/1227.aspx:

add this to JavaScript:
setTimeout('document.images["Progressbar"].src = "progressbar_green.gif"', 200);

and set ID of the image to "Progressbar".

Title: Not working with gif
Name: lp
Date: 10/4/2007 10:01:27 AM
Comment:
In FF it's working, IE7 and Opera not :-(

Title: Not working with gif
Name: lp
Date: 10/4/2007 9:47:28 AM
Comment:
Thx for the article.

But I got a problem. Text (Label) is working OK but using gif e.g. from http://mentalized.net/activity-indicators/ doesn't work - it shows only a white place. Any idea?

Title: This is NOT a AJAX based File Upload Method
Name: Adam Nemitoff
Date: 10/3/2007 10:32:54 AM
Comment:
The method documented here does a full post-back and therefore the title of this article is misleading!

Title: why?
Name: Mikal Schacht Jensen
Date: 10/3/2007 3:46:46 AM
Comment:
I've been attempting to upload files using ASP.NET ajax, and although I haven't spent much time exploring it, I always ended up having to do a full postback to actually be able to retrieve the file serverside. So when I first saw this article linked somewhere, I immediatly clicked over here.

I'm still a fairly inexperienced programmer with less than a year's paid programming under my belt. But having read it now, I fail to see the point of it all. Doesn't adding the button to a postbacktrigger make it cause a full postback, and thus defeat the entire purpose of using Ajax?

Title: Rc
Name: rahul
Date: 10/3/2007 2:33:35 AM
Comment:
good, but not explored ajax much