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We have different products selected from the dropdown list using productpr, we restrict the number that can be added to the cart by using a script in the form itself.

We use the onsubmit feature, and also:
if(this.qty.value>10 && this.productpr.value=='Small:10'){alert('Maximum of 10 please');return false;}
The form checks if the above product in the qty box is more than 10, if it is, a popup window is shown to the viewer.

With this example, small is a maximum of 10, medium is 20 and large is a maximum of 30.

Qty: