How to upload a file only once with blueimp file upload plugin?

I found the answer myself - It's enough to unbind the click event of the button after upload:

add : function(e, data) {
            $("#testUploadButton").on("click", function() {
                    $('#progress .bar').show();
                    if ($.browser.msie && parseInt($.browser.version, 10) < 10) {
                        $('#progress .bar').css({
                            "background" : "url(images/progressbar.gif) no-repeat",
                            "width" : "100%"
                        })
                    } else {
                        $('#progress .bar').css({
                            'background-color' : "#2694E8",
                            'width' : '0%'
                        });
                    }
                data.submit();
                $("#testUploadButton").off("click")
            })
        },

I had a similar problem where previously uploaded files were included in the next upload. You can try following solution below:

On Add Function just add "change" event of the file input element like below:

$('#YourFileUploadElementId').change(function(e) {
     data.files.splice(0); // Clear All Existing Files
});

Full Example Below:

$('#YourFileUploadElementId').fileupload({
    // Some options
    add: function (e, data) {
        $('#YourFileUploadElementId').change(function(e) {
          data.files.splice(0); // Clear All Existing Files
        });
    },
    // Other Events
 });

Note: Just change the YourFileUploadElementId to your file upload element id.

Here is the complete example on jsfiddle.net

http://jsfiddle.net/dustapplication/cjodz2ma/5/