disallowed file types are getting uploaded with jquery-ui version

[xenDev]

when files are added, "filetype not allowed" message is correctly shown but when "start uploads" is clicked, the disallowed filetype is uploaded anyway. The file is unnecessarily transferred to be only rejected by, hopefully, server side checks.

adding an additional check for !data.files[0].error in jquery.fileupload-ui.js fixes the bug for me but I am not sure if this is the best way.

    _startHandler: function (e) {
        e.preventDefault();
        var button = $(e.currentTarget),
            template = button.closest('.template-upload'),
            data = template.data('data');
        button.prop('disabled', true);
        if (data && data.submit  && data.files[0].error ) {
            data.submit();
        }
    },

[blueimp]

Closing as not reproducible on the demo.
The start button is rendered disabled at the start and is only enabled if validation passed:
https://github.com/blueimp/jQuery-File-Upload/blob/master/index.html#L161
https://github.com/blueimp/jQuery-File-Upload/blob/master/js/jquery.fileupload-ui.js#L112

[xenDev]

i am able to reproduce on the demo using "jQuery UI" version using Firefox 26.0 and Chrome 32.0 . Please try uploading an exe file. Both "Start" & "Start Uploads" buttons are enabled. After clicking it, you will see the progress bars moving.

Looks like you tested with "Basic Plus UI".

This commit recently fixed the bug for "Angular JS" version.
46fea69

[blueimp]

You are indeed correct, sorry I missed that you were actually referring to the jQuery UI version.
Will commit a fix shortly.