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9.0.4 BuyProductDialog breaks product page with large variant lists
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Joe Payne2  
#1 Posted : Tuesday, August 31, 2021 4:54:27 AM(UTC)
Joe Payne2

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Some of our products have extremely large variant lists. We can easily have 30,000+ variant combinations spread across 5 dropdowns on a single product.

This routine in ProductController.cs:
Code:

        [HttpPost]
        [Code.BuyProductDialog.GetChoiceSelections]
        [Code.BuyProductDialog.PrepareBuyProductDialogData]
        [Code.BuyProductDialog.AddToCartValidation]
        public ActionResult BuyProductDialog(BuyProductDialogParams parameters, int quantity, string addToCart, string addToWishlist, string subscribe, RestockNotificationSignup signup, decimal? price, bool? autoDeliver, short? deliveryInterval)


returns a Controller.Json() response. However the JSON response size is limited internally. It does not respect the JSON response size in web.config.

The result is any partial postback made when selecting variant dropdown choices (for large variant lists) throws an exception:
Quote:
Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.


The only solution I found in StackOverflow is here: https://stackoverflow.co...jsonlength-in-web-config

However the accepted fix didn't work because this isn't a web service. Further down you'll see the working solution for a controller action method is to rewrite the method's final return statement. Change it from:
Code:
return Json(new { status = "HTML", html = RenderRazorViewToString("_BuyProductDialog", model)});


to:

Code:

            return new JsonResult()
            {
                Data = new { status = "HTML", html = RenderRazorViewToString("_BuyProductDialog", model) },
                JsonRequestBehavior = JsonRequestBehavior.DenyGet,
                MaxJsonLength = int.MaxValue
            };


I suggest you make the same change as the product page will be broken for products with a large list of variant choices.

I'll continue to do more testing to be sure this resolves the issue and post here if I find new information. Ideally the variants list choices should be pulled individually via separate ajax requests to provide better scalability in larger stores. But I get why it's nice having everything loaded up in one call too.
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shaharyar  
#2 Posted : Tuesday, August 31, 2021 6:46:33 AM(UTC)
shaharyar

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Joined: 10/5/2018(UTC)
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Thanks for pointing this out. I am registering this as an improvement.
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