Making ajax form

Making an ajax form is a javascript code snippet that we see very frequently. So I've tried to write it as a pattern that could be easy to reuse when needed.

<form action="do_something" method="post" id="do_something_form"> 
  Field 1: <input type="text" name="field1" id="field1" /> 
  <br /> 
  Field 2: <input type="text" name="field2" id="field2"/> 
  <br /> 
  <input type="submit" value="Submit" /> 
</form> 

<script>
  jQuery('#do_something_form').submit(function(event){
    // stop normal form submitting
    event.preventDefault();
  
    // get form's fields
    var field1_val = jQuery('#field1').val(),
        field2_val = jQuery('#field2').val(),
        url        = jQuery(this).attr('action');

    // send request
    jQuery.post(url,                   // ajax url
                {
                  field1: field1_val,
                  field2: field2_val
                },                     // data passed to server side
                function(response){    // callback 
                  // do things with response data, ex:
                  alert(response["message"]);
                  if (response["success"] == true) {
                    // ... 
                  }
                },
                "json"                 // response's format 
    );
  });
</script>

Then at backend:

def create
  @form = params
  
  if some_condition
    @result = {
      :success    => true,
      :message    => "Resource has been created successfully!",
      :other_data => {}
    }
  else
    @result = {
      :success => false,
      :message => "Creation failed! Please try again!"
    }
  end

  render :text => @result.to_json
end

Reference:
http://api.jquery.com/jQuery.post/