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I've done a small diagram to illustrate how Isotope variants work, how to set them up and also how to vary attributes like price and shipping weight for a preset variant attribute like color.
[attachment=0:3h8rqyvy]isotopevariants-explain.jpg[/attachment:3h8rqyvy]
Is there any way to show the price for each variant (like you have done in the diagram) on the product reader page? So the user can see the price for each option without having to click on each one.
normally it's rendered into a select dropdown which auto-updates the price field, but I guess you could inspect the $this-> array to see where the fields are located.
The product does not include that information unles it is queried with specific variant set. My understanding is that variants are individual products grouped on the common product which appears in the productlist. I would not expect the grouping product to include the info you request.
I've requested something similar here: www.contao-forge.org/issues/2139