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How do I reference the fileuploader, trying to make msgbox appeaer if fileuploader hasnt been submitted

Posted on 2008-10-13
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Last Modified: 2013-12-17
I currently use this when one of  my dropdowns hasnt be selected. Now I need to be able to stop the user from submitting a request if the attachment hasnt been attached and the path is still visible in the uploader. I was going for an onlick if uploader is not blank then msgbox popup. The problem is I dont know how to reference the uploader. .Text .Value or another way? This is my attempt...

All help much appreciated
btnSubmit.Attributes.Add("onclick", "if(document.getElementById('FileUploadControl').text!='') {window.alert('Please submit your attachment before submitting request');return false;}");

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Question by:dwezil
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TimCottee earned 500 total points
ID: 22700890
Hello dwezil,

It is the .value property, however there is no guarantee that this will actually work. In IE it does if you allow active scripting that IE7 blocks. In firefox it doesn't seem to work at all. The reason for this is that access to that control is strictly controlled, in theory you should have no access to it (certainly no ability to write a value in there) and as I say there is no guarantee that client-side script will be able to access the .value property correctly on all browsers.

Regards,

TimCottee
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by:dwezil
ID: 22700911
well could i possibly create a text box that mirrors the text in the uploader and set the msgbox to react to whether that text box has text or not?
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by:TimCottee
TimCottee earned 500 total points
ID: 22700921
dwezil,

On the same basis, if you cannot access the property then you cannot mirror it. This is a case where your only recourse is to handle this in server-side validation rather than client-side.

TimCottee
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Author Comment

by:dwezil
ID: 22700927
thats annoying, I thought it would have been a simple thing to do
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by:TimCottee
TimCottee earned 500 total points
ID: 22700933
dwezil,

Indeed, it is a security thing though. Because that control is allowed access to the client's file system it poses a security risk as such it has been "locked down" in such a way to prevent any access to it with script. There is an obvious reason for this, if you could access that value easily and change it to a specific file you would then be able to silently upload any file from the client's machine to your server thus potentially compromising any system that viewed your page.

I understand the problem though and it is one that afflicts all of us.

TimCottee
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Author Comment

by:dwezil
ID: 22700960
not even FileUploadControl.HasFile. Im clutching at straws here
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Assisted Solution

by:TimCottee
TimCottee earned 500 total points
ID: 22701022
dwezil,

Server-side that is, and there it is no problem at all. It is simply the ability to interact with the control on the client-side that is severely restricted for security purposes. Once a user has selected a file and submitted the form then you can use .Hasfile etc in your server-side code quite happily. Of course the only problem with that is that you cannot prepopulate the fileupload element with the previously selected file name if it fails validation and is returned to the client.

TimCottee
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Author Closing Comment

by:dwezil
ID: 31505552
Thanks for your help Tim
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