Problem in uploading file through jquery ajax. It does not response anything. How it could solve out? Please help me..

[Jitesh Sinha]

<form class="trainee-form" id="question-bank" action="./libs/create-question.php" method="POST" enctype="multipart/form-data">

    <label class="legend">Upload Question Bank</label>

    <div class="form-controls">

        <label class="control-label" for="upload_question">Choose file:</label>

        <div class="controls">

            <input type="file" name="upload_question" id="upload_question" />

        </div>

    </div>

    <div class="form-controls">

        <label class="control-label" for="upload"></label>

        <div class="controls">

            <button type="submit" id="upload">UPLOAD</button>

        </div>

    </div>

</form>

<script>

    $(document).ready(function(){

        $('#question-bank').submit(function(){

            $.ajax({

                url: $('#question-bank').attr('action'),

                contentType:$('#question-bank').attr('enctype','multipart/form-data'),

                fileElementId: $('#upload_question').val(),

                dataType:'json',

                success: function(e){

                    $('div.dialog').html(e);

                }

            });

        return false;

        });

    });

</script>