Clear Rails remote form after submitting

In your action.js.erb file

$('#message_content').attr('value','');

Where action is the method name (which you don't state in your question) in your controller

When submit button is pressed for a form marked remote => true, javascript code in rails.js does the submit(). You need not override the functionality.

Try this instead in $(document).ready -

(Edit: Using bind instead of live. Thanks Darren Hicks.)

$("#new_message").bind("ajax:complete", function(event,xhr,status){
  $('#message_content').val('');
}

This adds an event handler for the ajax:complete event. This event is fired when your the ajax-submit-form is completed. More here.

Edit:

Don't forget closing ) on the bind method.

$("#new_message").bind("ajax:complete", function(event,xhr,status){
   $('#message_content').val('');
 })