how to upload an attachment in a couchapp

[Goog Cheng]

Hi,  all!  I  forked from here :https://github.com/jchris/proto/tree/photo  and  add some lines to the index.html 

<form id="recipe-upload" name="recipe-upload"><input id="_attachments" type="file" name="_attachments"/><input type="submit"/></form>
  </body>
  <script src="vendor/couchapp/loader.js"></script>
  <script type="text/javascript" charset="utf-8">
    $("#recipe-upload").submit(function(e) {
  e.preventDefault();
  var data = {};
  $("form :file").each(function() {
    data[this.name] = this.value;
  });

  if (!data._attachments || data._attachments.length == 0) {
    alert("Please select a file to upload.");
    return;
  }

  $(this).ajaxSubmit({
    url: "http://localhost:5984/doc/test",
    success: function(resp) {
      alert("ssss");
    }
  });
});  
  </script>

and why i have choose a file , it reminfs me "Please select a file to upload."

[Dave Cottlehuber]

On 14 November 2012 21:05, R.J. Steinert <r...@rjsteinert.com> wrote:
> Here's a basic example that I wrote. https://gist.github.com/4074427

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Nice work RJ! This would be a good addition to
http://wiki.apache.org/couchdb/Working_with_Forms which is missing a
section "using client-side javascript", if you want to contribute it!

A+
Dave