Managing your shopping cart using AJAX

Hi everybody,

This short article is inspired by several forum posts on our developer portal – people were asking about the ability to add items to the shopping cart without reloading the entire page. Furthermore there was a question about how to update the status of the shopping cart (total number of products as well as the total price) after the new product has been added to the cart this way. You can read the entire conversations here and here.

Well, I must say that it’s quite easy to implement this kind of behavior by using the eCommerce Extensibility API. So I spend some time and wrote a simple extension that incorporates the above mentioned functionality.

Update: Kevin Steffer has pointed out that the same results can be achieved without writing any custom code. Take a look at how he does it: Howto implement an AJAX based shopping experience in Dynamicweb eCommerce.

Where to get it

The extension can be downloaded from the following location: Download – The package consists of the following items:

  • Server-side extension (bin\AsyncCart.dll)
  • Stylesheet just to make it look a bit prettier (AsyncCart.css)
  • Small Javascript library that is responsible for all client-side interactions (AsyncCart.js).
  • Custom “Show cart” template (AsyncCart.html).

How to install

First of all the following requirements must be met before you can use the extension:

  • The version of Dynamicweb application must be or higher.
  • You must have the Cart v2 module installed (as well as eCom Catalog module of course).
  • Either jQuery or Prototype JS must be enabled in the frontend (you can do it by going to Management Center -> System -> Solution Settings and selecting the desired framework under the Google API Includes section).
The process of installing the extension is pretty straightforward:
  • Copy bin\AsyncCart.dll file into the /bin folder of your Dynamicweb installation.
  • Copy AsyncCart.js, AsyncCart.css, AsyncCart.html into /Files/Templates/eCom7/Cartv2/Step.
  • Create new page and put both Cart v2 and eCom Catalog module on it.
  • Go to the paragraph settings of the Cart v2 module, under the Steps section click Edit button next to the Show cart step. Choose AsyncCart.html as a template, click OK and save the paragraph.
  • Go to the paragraph settings of the eCom Catalog module and open the product list template for editing. Find your “Add to cart” button/link and add the “onclick” attribute as shown below.

The “addToCart” function is defined in the AsyncCart.html template.

Further development

There is a certain room for improvements of this extension For example, maybe you’d like to render the entire cart instead of updating just two numbers (items total and the total price) or maybe there’s a bug that I didn’t see. For those of you who are interested in improving the extension (and also for all those who’s just curious about how the code works) I’ve put the complete source code for download. You can get it here: Download –


I hope that this small extension will help someone implementing another great eCommerce solution. If you have any questions – feel free to contact me (you can either post the comment here or you can go to our developer forum ask your question there).

Take care.


  1. Posted May 27, 2011 at 9:54 pm | Permalink | Reply

    Cool, but we actually do this on any standard Dynamicweb solution (without any custom code) by having a special set of templates that can output cart/catalog data on a page in XML or JSON format.
    Our JavaScript then interacts with theses pages to add/remove/modify items to cart and also rendering the updates of the cart itself.

    You can see one of our latest implementations here:

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