jQuery Submit form if change input value

I'm used jquery.form plugin, it's working and good but when change input value.. it's submitted good! but redirect me to my uploader.php file, i don't want redirect me, i need to get result in div.result,

to understand me, please look to my code:

HTML

<form id="uploader" action="uploader.php" method="post" enctype="multipart/form-data">
    <input id="file" type="file" name="uploader" value="" draggable="true">
    <input name="submit" type="submit" class="submit" value="Upload">
    <div class="result"></div>
</form>

uploader.php file:

<?php
    if( isset($_POST['submit']) and $_SERVER['REQUEST_METHOD'] == "POST" ){
        echo 'done!';
    }
?>

jQuery code:

jQuery(document).ready(function() {

    $('#uploader').change(function(){

        $(".result").html('');

        $(".result").html('wait..');

        $("#uploader").ajaxForm({
            target: '.result',
            success: function() 
            {
                $('.result').hide().slideDown('fast');
                $('#uploader')[0].reset();
            },

        });

    });

});

I need to echo 'done' in .result div, i don't want to redirect me to uploader.php page.

Working with .ajaxSubmit({})

jQuery(document).ready(function() {

    $('#file').change(function() {

        $(".result").html('');
        $(".result").html('wait..');

        $("#uploader").ajaxSubmit({
            target: '.result',
            success: function() 
            {
                $('.result').hide().slideDown('fast');
                $('#uploader')[0].reset();
            },
        });

    });

});

Thanks everybody.