Script5: Access is denied intermittent error on Kendo file upload

[Shawn Taylor]

I am using the Kendo UI Upload control with the Knockout-Kendo.js project's binders.  I have a file upload control on my form and am seeking to upload the file through the ajax callback provided by the Knockout-Kendo.js api.  Most of the time, the upload goes through successfully, but every once in a while, so far only on IE, there's an issue and I get a javascript error saying "SCRIPT5: Access is denied."   I've read that IE9 has security rules that can cause this error in certain situations, but I do not understand well enough how the kendo ui control works (or how the knockout-kendo library works) to understand what I might need to change to prevent the error.  Any ideas will be very much appreciated!

Here is a simplified version of my code:
In the view:

<input name="fileUpload" type="file" id="fileUpload" data-bind="kendoUpload: $root.fileUploadSettings()" />

In the javascript viewmodel:

var fileCategory = "myCategory";

fileUploadSettings = function () {
        var kendoSettings = {
            multiple: false,
            enabled: true,
            async: { saveUrl: "../Entity/AddFiles" },
            success: function (e) { _uploadFileSuccess(e, fileCategory); },
            error: function (e) { _uploadFileError(e, fileCategory); },
            select: function (e) { _uploadFile(e, fileCategory); },
            localization: { select: "Upload File" },
        };

In the MVC controller: 

[HttpPost]
public ActionResult AddFiles(File data, System.Web.HttpPostedFileBase fileUpload)
{
    try
    {
        File file = FileUIService.AddFile(data, fileUpload);
        FileView rfv = new FileView()
        {
            Id = file.Id,
            Name = fileUpload.FileName.Substring(fileUpload.FileName.LastIndexOf('\\') + 1)
        };

        return Json(rfv, "text/plain");
    }
    catch (Exception ex)
    {
        return Json(ex.Message, "text/plain");
    }
}

[Daniel]

Hello,

I posted my reply in the support ticket on the same topic. For convenience I am pasting it below:

This error is thrown in Internet Explorer when opening the dialog by triggering the click event via code instead of clicking on the button. This is a security feature of the browser and the same error can be reproduced with an input type file. How is the dialog opened in your scenario?

Regards,
Daniel
Telerik

[Shawn Taylor]

Yes, I do see posts online about this error being triggered when a click event on an upload control is triggered indirectly through javascript.  Unfortunately, I do not see how that may apply in this situation.  My upload is triggered by the user clicking on a control on the page.  As far as I know, that control is the input control that I included in the code section of my original post.  Unless knockout-kendo library or the kendo ui library is manipulating the DOM in a way I would not expect, the click event is being directly triggered by the user.  I've looked through the knockout-kendo library, and it appears that the code there is concerned only with the binding between the viewmodel and the kendo-ui widget, not with adding or removing anything from the DOM.  I am not familiar with the internals of the kendo-ui widget itself, but I assume that you would be aware if that were causing the click even to be indirectly triggered.  

I should perhaps also tell you that in the case where this issue is occurring for me, the kendo widget is in a popup window.  I am using ASP.NET MVC, and that popup window is loaded by making an ajax call to an MVC action that returns a View (not a PartialView).  That View is then populated into a div in the original view by setting its html property via javascript:

function loadPopupWindow (url, window, width, height, title) {
     var windowElement = $('#' + window).data("tWindow");
     $(windowElement.element).find(".t-window-content").css("height", height).css("width", width);

    $('#' + window + " .t-content").empty();
    $.ajax({
        url: url,
        success: function (data) {
            $('#' + window + " .t-content").html(data);
        },
        cache: false
    });
    windowElement.center().open();
}

[Daniel]

Hello,

I posted my reply in the support ticket. In order to avoid duplication, lets continue the communication either in the forum or in the support thread.

Regards,
Daniel
Telerik