Rails：远程：从select_tag为true

Question

I'm calling an AJAX function from a select_tag like so:

<%= select_tag 'quantity', options_from_collection_for_select(order.options), :quantity, :quantity, order.quantity), onchange: "update_price(#{order.id}, this.value);" %>

And here's the function:

<script type='text/javascript'>
  function update_price(order_id, quantity) {
    $.ajax({
      url: "/cart/" + <%= @cart_transaction.id %> + "/update_quantity",
      type: "POST",
      data: {
        "order_id" : order_id,
        "quantity" : quantity },
      dataType: "html"
    });
  }
</script>

My .js.erb isn't called ever, and I suspect it's because I haven't specified remote: true anywhere, but since I don't have a form per se I don't know how to do that. Any help?

Relevant controller code here:

class CartTransactionsController < ApplicationController
  load_and_authorize_resource

  respond_to :html, :js

  before_filter :set_cart_transaction

  def update_quantity
    @order = @cart_transaction.orders.find(params[:order_id])
    @price = current_user.brand.prices
                         .where(template_id: @order.document.template.id)
                         .where(quantity: params[:quantity]).first
    @order.update_attributes(
      price_cents: @price.amount_cents, quantity: params[:quantity]
    )
    @cart_transaction.save!
    respond_to { |format| format.js }
  end

  private

  def set_cart_transaction
    @cart_transaction = current_user.cart
  end

  def cart_transactions_params
    params.require(:cart_transaction).permit(
      :name, :email, :delivery_address, :comments
    )
  end
end

Update

Here's the .js.erb that isn't called for some reason:

console.log("update_quantity.js.erb file");

$('#price_cell').html("<%= j render(partial: 'price', locals: { order: @order }) %>");
$('#subtotals').html("<%= j render(partial: 'subtotals', locals: { cart_transaction: @cart_transaction }) %>");

Answer 1

Try this:

function update_price(order_id, quantity) {
    $.ajax({
      beforeSend: function(xhr) {
        xhr.setRequestHeader('X-CSRF-Token', $('meta[name="csrf-token"]').attr('content'));
      },
      url: "/cart/" + <%= @cart_transaction.id %> + "/update_quantity",
      type: "POST",
      data: {
        "order_id" : order_id,
        "quantity" : quantity }
    });
  }

Answer 2

使用dataType：“ script”，它将工作并呈现js.erb