Why store raise error alert when I enter characters instead of number?

[gsmsalers]

Hi.
When I enter character in place of quantity of shopping cart then it doesn't alert to customer about invalid input.
It supposed to accept number value only, so it should inform customer when they tried to enter character. But without any alert it simply go to shopping cart.

[Ajeh]

This is being addresses in the Zen Cart v1.6 to provide messages when customers try to add "abc" to the cart ...

[gsmsalers]

Thanks for your response.

This is being addresses in the Zen Cart v1.6 to provide messages when customers try to add "abc" to the cart ...