beforeSend - doesn't work at all

_new.html.haml

=simple_form_for(@transaction, :remote => true ) do |f|
	=f.error_notification

	=f.input :description
	=f.input :amount
	=f.collection_radio_buttons :kind, [['expense', 'Expense'] ,['income', 'Income']], :first, :last
	=f.button :submit, "Create New Transaction", :class => "btn btn-primary btn-large", :name => "create_transaction"

create.js.erb

$('form#new_transaction')
.bind("ajax:beforeSend", function() {
	alert("ajax:beforeSend has been triggered"); // Doesn't work...why?
})
.bind("ajax:success", function(){
      alert("ajax:success has been triggered"); // Workes
})
.bind("ajax:complete", function(){
	alert("ajax:complete has been triggered"); // Workes
});

new.js.erb

$("#transaction-modal .modal-body").html("<%= escape_javascript(render :partial => "transactions/new") %>", function() {
	$('#transaction-modal').modal('show');
});