Rails - Mar 2009 - Ajax file upload with remote_form_tag

when I tried below, it worked

<form
 target="upload_iframe"
 action="/profile/validate_charts_file"
 id="upload_charts"
 method="post"
 enctype="multipart/form-data">
  <input type="file" name="charts_file"
id="filename" />
  <input type="button" name="submit"
class="button_light" value="Upload"
/>
</form>
<iframe id="upload_iframe" name="upload_frame"
style="display:
none"></iframe>

I could receive the file at server end through params[:charts_file].

Now i wanted to have it ajax so I just added the ''onSubmit''
like below,
and it didnt work ...

<form
 target="upload_iframe"
 action="/profile/validate_charts_file"
 id="upload_charts"
 onsubmit="new
Ajax.Request(''/profile/validate_charts_file'',
    {asynchronous:true, evalScripts:true,
    parameters:Form.serialize(this)});return false;"
 method="post"
 enctype="multipart/form-data">
  <input type="file" name="charts_file"
id="filename" />
  <input type="button" name="submit"
class="button_light" value="Upload"
/>
</form>
<iframe id="upload_iframe" name="upload_frame"
style="display:
none"></iframe>
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one correction to above

please read following occurrence

<input type="button" name="submit"
class="button_light" value="Upload"

as

<input type="submit" name="submit"
class="button_light" value="Upload"

thanks
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