Upload control : upload file twice, in ajax and with final POST submit button

[Richard]

Hello,

I have posted the following question on Stack Overflow :

https://stackoverflow.com/questions/60001543/telerik-upload-control-in-mvc-core-upload-file-twice-in-ajax-and-with-final

Basically, I need to be able to post the file in a Telerik Upload control twice : in async mode (works fine), and at final POST of the form with a submit button. The file is not posted with the submit button in form, despite the form seem to be correctly declared.

I guess this is due to the fact to have enabled Async mode on the upload control.

The control is defined like this :

@(Html.Kendo().Upload()

    .Name("fileUpload")

    .Multiple(false)

    .Async(a => a

        .Save("AnalyzeFile", "Request")

        .AutoUpload(true)

    )

    .Events(e => e.Success("onUploadOperationSuccess"))

    .Validation(validation => validation.AllowedExtensions(new[] { ".csv" }))

    .HtmlAttributes(new { style = "width:100%" }))

 

and the form :

@using (Html.BeginForm("Save", "Request", FormMethod.Post, new { @class = "form-horizontal", id = "requestForm", enctype="multipart/form-data" }))
{
    ...
    <button id="finalSubmit" type="submit" class="k-button k-primary">Valider</button>
}

[Ivan Danchev]

Hello Richard,

The Upload's async mode is designed to send the file on selection (or after confirmation with the autoUpload option set to "false"). It is not designed to be used in a form. The sync mode is to be used when submitting the files with form, but this mode does not work with a handler and does not make a request to the server on file selection. In this mode the Upload works as a standard <input type="file"> and the files are sent with the form submission. 

That being said, I don't think we can come up with a workaround for your scenario. There is a thread in stackoverflow: https://stackoverflow.com/a/35200162

in which Murat demonstrates how the selected files can be sent with an AJAX request, but this essentially sends the form data not just the files Thus, I am not sure whether it is applicable to your case, since it would mean sending the form data twice.

Regards,
Ivan Danchev
Progress Telerik

[hines]

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