ASP.NET

18-Oct-06 14:45

I have recieved no answer from my previous query but I do have more information so hopefully I someone may have some more information for me. (For a quick reminder I am creating an ASP.NET control to upload n number of files and as part of that I am using Javascript to dynamically generate file inputs through the DOM)

When uploading a file through ASP.NET the encoding type of the form must be "multipart/form-data" which I already knew, however, it must be the HtmlForm for the page that is set and not just any form. (http://msdn2.microsoft.com/en-us/library/system.web.ui.htmlcontrols.htmlform.aspx, and http://msdn2.microsoft.com/en-us/library/system.web.ui.htmlcontrols.htmlinputfile.aspx)

A simple loop through Page.Controls reveals the HtmlControl for the page if there is one. (Surprise there is no method to return it! so you must roll your own) With this set I am still unable to upload files!

Now here is where it gets really interesting: If I add <input type="file" id="thisIsATest" runat="server"/> somewhere in my user control everything works even though I am not using the thisIsATest element for the upload. I can't find any meaningful difference in the HTML source between the two.

Any ideas?

On two occasions I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question. - Charles Babbage

minhpc_bk18-Oct-06 15:36

18-Oct-06 15:36

Ennis Ray Lynch, Jr. wrote:
A simple loop through Page.Controls reveals the HtmlControl for the page if there is one. (Surprise there is no method to return it! so you must roll your own) With this set I am still unable to upload files!

You can use the HttpRequest.Files Property [^] to access the uploaded file collection.

Ennis Ray Lynch, Jr. wrote:
I can't find any meaningful difference in the HTML source between the two.

The difference is that the HtmlInputFile marked with runat="server" will set the Enctype = "multipart/form-data" for the form element if this property is empty.

Ennis Ray Lynch, Jr.18-Oct-06 15:44

18-Oct-06 15:44

Heh, the problem is the HttpRequest.Files.Property does not get populated when you generate your own html code using Javascript and DOM even if you set the enctype.

minhpc_bk18-Oct-06 15:45

18-Oct-06 15:45

Ennis Ray Lynch, Jr. wrote:
HttpRequest.Files.Property does not get populated when you generate your own html code using Javascript and DOM even if you set the enctype.

Yes, it does.

Ennis Ray Lynch, Jr.18-Oct-06 15:56

18-Oct-06 15:56

I may seem like a moron but I am not, I have actually been working on this for quite a while. When I generate input type of file using javascript they are not uploaded on the post even when the encType is properly set unless I have placed one using the designer.

minhpc_bk18-Oct-06 16:23

18-Oct-06 16:23

Below is a quick example:

<%@ Page Language="C#" %>
      
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
       
<script runat="server">
          
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        Response.Write(string.Format("Files uploaded: {0} <br/>", Request.Files.Count));
        HttpFileCollection files = Request.Files;
        for(int index=0; index<files.Count; index++)
        {
            Response.Write(string.Format("Filename: {0} size: {1} <br/>", files[index].FileName, files[index].ContentLength));
        }
    }
</script>
        
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Dynamic upload</title>
    <script type="text/javascript">
        var iCount = 0;
        function AddInputFile()
        {
            iCount++;
            var inputFile = document.createElement("<input type='file' id='file" + iCount +"' name='file"+ iCount +"' />");
            var br = document.createElement("<br/>");
                     
            var container = document.getElementById("divInputFile");           
            container.appendChild(inputFile);
            container.appendChild(br);
        }
    </script>
</head>
<body>
    <form id="form1" runat="server" enctype="multipart/form-data">
    <div id="divInputFile">
              
    </div>
    <button on_click="AddInputFile();">Add New Upload</button>
    <asp:Button runat="server" ID="btnUpload" Text="Upload" On_Click="btnUpload_Click" />
    </form>
</body>
</html>

Ennis Ray Lynch, Jr.18-Oct-06 16:31

18-Oct-06 16:31

That is nearly identical to what I have. Yet for some reason it does not work. The only way I can get it to work is to type out

<br />
<input type="file" runat="server" id = "blah" /><br />

Somewhere in the html in the aspx page. If that isn't there the upload doesn't work! That is why I am so troubled, it is supposed to work.

BTW

Ennis Ray Lynch, Jr.18-Oct-06 16:32

18-Oct-06 16:32

Which .NET version did you write your code in? I am writing in 1.1 at work which is were I am having the problem.

Re: BTW

minhpc_bk18-Oct-06 16:39

18-Oct-06 16:39

Ennis Ray Lynch, Jr. wrote:
Which .NET version did you write your code in? I am writing in 1.1 at work which is were I am having the problem.

I'm doing the version 2.0 (v2.0.50727), I'll try in the version 1.1 then.

Re: BTW

minhpc_bk18-Oct-06 16:49

18-Oct-06 16:49

It works just fine with the v1.1.4322 version.

Re: BTW

Ennis Ray Lynch, Jr.18-Oct-06 16:55

18-Oct-06 16:55

I will just try backing out until it works (hopefully). Thanks for checking for me, btw. I think it might be related to the form tag then.

Ennis Ray Lynch, Jr.19-Oct-06 4:12

Aha: Those that don't know everything may be interested

19-Oct-06 4:12

Your html head is marked as runat server, does that mean AddInputFile is running at the server?

Ennis Ray Lynch, Jr.19-Oct-06 7:13

Forms Authentication Question [modified]

19-Oct-06 7:13

ASP.NET will autogenerate a name element for all controls created on the server-side and the HTML spec, http://www.w3.org/TR/html4/interact/forms.html#successful-controls[^], states the name is required for Successful controls and only successful controls are required to be posted back.

To make it weird it seems browser agents still group by id for a post so input elements with the same id are submitted if at least one has a name? Neat. So, if you want to dynamically generate input elements in client-side java script you must include the name attribute in the input element tag!

Rob Walter18-Oct-06 12:05

Rob Walter

18-Oct-06 12:05

Hi All,

We currently use our own authentication scheme for our ASP.Net applications. However, we now investigation using Forms Authentication so we can take advantage of some the personalization and web parts functionality in .Net 2.0.

Is it possible, on a single web server, to have a single login virtual directory that contains the login page, but require each user to authenticate to each application. Example

|   web server root
|
| - Application1
  |
  | - default.aspx
|
| - Application2
  |
  | - default.aspx
|
| - Login
  |
  | - login.aspx

So, basically, is this scenario possible using forms authentication. I've been trying and seem to get in a loop. I access application1, it redirects to the login page, authenticates OK, redirects back to application1, but it takes me back to the login page.

Any help would be greatly appreciated.

Regards,

Robert

-- modified at 18:26 Wednesday 18th October, 2006

Re: Forms Authentication Question

minhpc_bk18-Oct-06 15:43

Re: Forms Authentication Question

18-Oct-06 15:43

The problem here IMO is that the Login.aspx web page is located outside the boundary of the web application such as application1, so the authentication ticket generated does not have meaning to the application1 and as a result of that the application1 refuses to access its web page. What you might need to do is to configure so that the authentication cookies can be used across the application boundary, for more details you can see Forms Authentication Across Applications[^]

Also, you require the authentication for each application, not for all, so the name of the authentication cookie should be dynamically set in the Login page depending on which application is currently accessed.

Rob Walter22-Oct-06 15:51

Rob Walter

22-Oct-06 15:51

Hi,

Still haven't been able to get it to work... I've tried changing the cookie name in code dynamically but the properties I've trying to use are read-only. Which property should I be setting in code?

Here is the Login virtual directory web.config:

<authentication mode="Forms"><br />
    <forms loginUrl="/FALogin/Login.aspx" name="Login" protection="All"  path="/" <br />
           timeout="30" enableCrossAppRedirects="true"><br />
    </forms><br />
</authentication><br />
<authorization><br />
  <allow users="?" /><br />
</authorization><br />
<machineKey validationKey="C50B3945949462D0E8DB8CB5CDA1742572A487D9401E3400267682B202B746511891C1BAF47F8D25C07F6C39A104696DB51F17C529AD3CABE" <br />
      decryptionKey="8A9BE8FD67AF6979E7D20198CFEA50DD3D3799C77AF2B72F" <br />
        validation="SHA1" />

Here is the Application 1 virtual directory web.config:

<authentication mode="Forms"><br />
    <forms loginUrl="/FALogin/Login.aspx" name="Application1" protection="All"  path="/" <br />
           timeout="30" enableCrossAppRedirects="true"><br />
    </forms><br />
</authentication><br />
<authorization><br />
  <allow users="?" /><br />
</authorization><br />
<machineKey validationKey="C50B3945949462D0E8DB8CB5CDA1742572A487D9401E3400267682B202B746511891C1BAF47F8D25C07F6C39A104696DB51F17C529AD3CABE" <br />
      decryptionKey="8A9BE8FD67AF6979E7D20198CFEA50DD3D3799C77AF2B72F" <br />
        validation="SHA1" />

Thanks.

Robert

Re: Forms Authentication Question

minhpc_bk23-Oct-06 5:49