Customizable Options type "Field" what is the best practice to do input validation?

[f1outsourcing]

I have a product with two "Customizable options" of type field. I would like the value of one field to be input verified. Something like text should end with "12121212" otherwise refuse to add to cart/wishlist etc.

What would be the adviced way to create such input field validation?

[LitExtension Expert]

Hi @f1outsourcing, 

You can fire the event when adding the product to the cart/wishlist to check the fields according to your needs.

Hope this can help you! Let me know if you need further assistance.

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[f1outsourcing]

Hi Marcus,

Thanks for the reply Is that not a bit drastic, having to monitor events? Maybe I understand not correctly, do you have a link to an example?

I was actually thinking of something more client side, because it is not really possible to abuse this, it is more of a convenience so people are not entering the wrong data.

I already had to create a theme, I thought maybe 'copy' some product page into the theme and ad there some javascript?