There is no reaction upon clicking the "add to cart" button despite having established the "jqclick" function.

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Possible reasons for this issue could be:

1. Incorrect implementation of the "jqclick" function: Check if the function is defined properly and if it is being executed on the correct element.

2. Conflicting code or errors: Check if there are any other JavaScript errors on the page that might be impacting the execution of the "jqclick" function.

3. Missing or incorrect selectors: Ensure that the "add to cart" button has the correct selector in the "jqclick" function.

4. Issues with the server-side code: Check if the server-side code responsible for adding the item to the cart is working properly and there are no errors or bugs.

5. Browser issues: Test the functionality in different browsers to see if the issue is specific to one browser or not.

It is essential to identify the root cause of the problem to rectify it.