ajax request with form_remote_tag doesn't work

So I'm using a form_remote_tag to attempt an ajax form submission, like so:

<%开发者_如何学JAVA form_remote_tag :update=> 'test', :url=> {:action=>'test_action'} do -%>

It renders with no apparent problem:

<form action="/pages/test_action" method="post" onsubmit="new Ajax.Updater('test', '/pages/test_action', {asynchronous:true, evalScripts:true, parameters:Form.serialize(this)}); return false;">

The test_action action:

def test_action
  if request.xhr?
    render :text => 'some text'
  else
    puts 'nope'
  end
end

When I submit the form(via the submit button, nothing weird like the jquery submit() event), no ajax request is made. The xhr check returns false. Help please??

---

In controller you should respond to specified format, js in your case. For example:

def create
  @item = Item.new(params[:item])

  respond_to do |format|
    if @item.save
      flash[:notice] = 'Item was successfully created.'
      format.js
      format.html { redirect_to(@item) }
      format.xml  { render :xml => @item, :status => :created, :location => @item }
    else
      format.html { render :action => "new" }
      format.xml  { render :xml => @item.errors, :status => :unprocessable_entity }
    end
  end
end

The best practice for now is to use unobtrusive javascript (UJS). There is no form_remote_tag in rails 3. UJS can be used with rails 2.3 as well.