jQuery Uploadify Advanced File Validation Question

After long time of searching the best upload technique I've decided to go with jQuery Uploadify.

I got no problem implementing it into existing code, excluding one thing. I created strict upload validation rules.

The main problem is that onAllComplete() function returns success message. In my validation file I tried to use echo 'errror' and die('error') as well. Without any luck. I've searched Google and SO. Without any luck.

Do you have any ideas/advices/snippets? Any help appreciated.

Update
To make my situation clear. I'm using onComplete() function to show eventual but I have no idea how to force onAllComplete() function to show correct data.

Update 2 I applied IgalSt (I'm sure I did something similar before) but still having the same issue. My onComplete function looks as following now:

onComplete: function (ev, queueID, fileObj, response) {
    var result = $.parseJSON(response).success;
    alert(result);
            if (result == false) {
        alert('invalid')
    } else {
        alert('everything is OK');
        var size = Math.round(c.size/1024);
    }
    return false;
},

If I alert(response) it alertsfalse` so it should be working. Any suggestions why it's not? onAllComplete() function still shows this file as uploaded successfully.

Regards, Tom

Solution

as long as the server returns 200 state header you the onAllComplete callback will fire. onError callback will fire only when you've got an error header back: 500 or 404 for example. Therefore, your server side code should return a response with a flag if there was a problem and you should use onAllComple to do some kind of IF for than.

For example if you page return a JSON with error:

[{"success":"false"}]

you onAllComplete function will look something like that:

'onComplete':   function(ev, queueID, fileObj, response) {
            var result = $.parseJSON(response).success;
            if (!result)
              alert('invalid')
                        else
                           alert('everything is OK');
        }