SWFUpload works in IE, but not in Firefox

Question

Using SWFUpload v2.2, Firefox 3, IE 8, Flash 10 In my ASP.NET application all uploads are being processed by upload.aspx (I have the correct upload_url set in the settings object). In IE 8 the uploads hit the upload.aspx page and are processed, but in Firefox they do not. Any suggestions?

Most of the code for the page that the user visits to upload a file is shown here (note: master pages are being used):

<script type="text/javascript" src="../swfupload/swfupload.js"></script>

<script type="text/javascript" src="../js/handlers.js"></script>

<script type="text/javascript">
    var swfu;
    window.onload = function() {
        swfu = new SWFUpload({
            // Backend Settings
            upload_url: "../upload.aspx",
            post_params: {
                "ASPSESSID": "<%=Session.SessionID %>"
            },

            // File Upload Settings
            file_size_limit: "10 MB",
            file_types: "*.*",
            file_types_description: "All Files",
            file_upload_limit: 1,
            file_queue_limit: 1,
            //assume_success_timeout: 60,

            // Event Handler Settings - these functions as defined in Handlers.js
            //  The handlers are not part of SWFUpload but are part of my website and control how
            //  my website reacts to the SWFUpload events.
            file_queue_error_handler: fileQueueError,
            file_dialog_complete_handler: fileDialogComplete,
            upload_progress_handler: uploadProgress,
            upload_error_handler: uploadError,
            upload_success_handler: uploadSuccess,
            upload_complete_handler: uploadComplete,

            // Button settings
            button_image_url: "../Images/XPButtonNoText_160x22.png",
            button_placeholder_id: "spanButtonPlaceholder",
            button_width: 160,
            button_height: 22,
            button_text: '<span class="button">Upload File<span class="buttonSmall">(10 MB Max)</span></span>',
            button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',
            button_text_top_padding: 1,
            button_text_left_padding: 5,

            // Flash Settings
            flash_url: "../swfupload/swfupload.swf", // Relative to this file

            custom_settings: {
                upload_target: "divFileProgressContainer"
            },

            // Debug Settings
            debug: false
        });
    }
</script>

Answer 1

Use an HTTP trace/debugging proxy to see if anything is actually being sent to the server at all and what response is being received, if any. Charles is my favorite and works great with Flash (and everything else HTTP). WireShark and Fiddler are other options.

Charles http://www.xk72.com/charles/

WireShark http://www.wireshark.org/

Fiddler http://www.fiddler2.com/fiddler2/

Answer 2

I know, its an old post, but maybe it will help to solve the problem for some people, because i had the same problem today.

I solved this problem not with using the post array, because i don't know how, and where to debug this script, but with generating a querystring

<script type="text/javascript">
    var swfu;
    window.onload = function() {
        swfu = new SWFUpload({
            // Backend Settings
            upload_url: "../upload.aspx",
            post_params: {
                SessionID: "<%=Session.SessionID %>",
                OtherID: "<%=OtherID %>"
            },

            //And here comes the highlight

            use_query_string : true,

            //code ...

After this you will get a querystring like this: ?SessionID=(id)&OtherID=(otherid)

This works with guarantee under every browser.