This is simple JoomShopping plugin that prevents adding the same item to the cart again. The user will receive a notification "you have already added this item to the cart". It's useful for e-commerce sites that has products with similar names.
No Duplicate Product in Cart for JShopping can be installed as usual Joomla extension. Download the latest version, proceed to your website: Control Panel > Extensions > Extension manager > Install extension.
The plugin has no settings. Just enable it after the installation.
If you want to change the notification text, you can use Joomla language override feature. Please go to Administrator Panel > Extensions > Languages > Overrides. Then select preferrable front-end language (e.g. English (en-GB) Site) in the filter and add a new
"You have already added this item to the cart" is an example of the text, but you can define your custom text. The result will be like that: