Topic: How to add some ajax to shopping cart in rails?

All i want to do in simple words: When input value is changed, i'll put this value in db. I want to add some ajax. I want to do this: When I change my input value (focusout), i call some method, using get-parametr, my method looks like this:

def update_quantity
    @cart = current_cart
    @line_item = LineItem.find(params[:id])
    respond_to do |format|
      if @line_item.update_attribute(:quantity, params[:quantity]) #&& @cart.id == params[:cart]
        format.html { redirect_to(@line_item, :notice => 'Line item was successfully updated.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @line_item.errors, :status => :unprocessable_entity }
      end
    end
  end

This is test-work, so it maybe have some bad solutions, and my view looks like this:

%p
    = line_item.art_name
    = line_item.ART_ID
    = line_item.art_code
    &times
    .cart-quantity
        = line_item.quantity       
        %input{ :class => "quantity", :value => line_item.quantity }
        = link_to "обновить", :controller => "line_items", :action => "update_quantity", :id => line_item.id, :quantity => line_item.quantity, :cart => @cart.id   
    = line_item.total_price

As you see, I want to: when input focus is out, i get new hidden link, and call it, which calls method, which is written upper. What i need to do? what files to create and where, and how to do this? Wanna some ajax)

All i want to do in simple words: When input value is changed, i'll put this value in db.

Re: How to add some ajax to shopping cart in rails?

I really like this subject. Could you tell me more … I would love to explore.


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