Hello,

I have an ASPxUpload control in a simple form allowing users to upload files to be associated with online articles. However, if the form's submit button is clicked, any files currently chosen in the upload form are automatically uploaded. How do I stop the UploadControl uploading files to the server when a form submit is clicked. I tried uploader.Cancel(); in the button's onClientClick event but that didn't work.

Thanks in advance. 

Hi!

The ASPxUploadControl uses the standard input element with the type="file" to upload files.
The input element always uploads a selected file when form submitting is performed.
When submitting a form, all form data is sent to the server, and file uploading is performed.
It's impossible to cancel file uploading only. It's possible to cancel form submitting only.
Here is the code, implementing this behavior:

The client-side ASPxClientUploadControl.Cancel method allows you to cancel file uploading via callback only.
You can learn more about this method from the following help topic:

http://www.devexpress.com/Help/?document=ASPxperience/DevExpressWebASPxUploadControlScriptsASPxClientUploadControl_Canceltopic.htm

Hi Andrew,

Thanks for getting back to me. If that is the case, how do I loop through all the file input elements within an Upload control? GetText() returns only the contents of the first input element and GetControlCollection() is not recognised as a function of ASPxClientUploadControl. What I need to do is check that all file input elements in the Upload control are blank and if that is the case, then allow the form submission to proceed, otherwise cancel the form submit.

Thanks, dan

Hi!

Use the client-side ASPxClientUploadControl.GetText method with an integer parameter, for example:

Hi Andrew,

That works a treat. Thanks for pointing out that GetText can also take an integer parameter. I had missed that.

Dan