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Originally Posted by aquaimaging
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Hi. Your post reminded to look into this - although you do have the ability to write some custom javascript for a given product option group via the product admin tools, the code you write is only executed when one actually submits the form to add the product to one's cart. What would be more useful - such as in your case - is to be able to add some custom javascript that is executed by the onchange() event. This is what the stock x-cart does, actually - it calls a function called check_options().
In any case, I'm nearly done with a mod that allows you to add some custom javascript that gets called by check_options(). I just added a textarea for that code beneath the existing one on the product options admin page and added a field to the product_options_js db table to store it. It's functional now, I just need to write up the steps and will try to get that posted tonight. I had to modify a bit more than I would have liked, but I'll go ahead and post what I've got asap.
Nate