VM2 AJAX Update Price on Child Product Selection

[q-styler]

Hi!
I'm building a webstore with VirtueMart 2.0.6 on Joomla 2.5.4.

So I'm having a fan that has several models with different prices and SKUs of course.

I created a product and some child products. Each of them has its SKU and price. (pic in russian)


Then I created a "Generic Child Variant" custom field with these options:
Published: Yes
Cart Attribute: Yes
Only Administrator: No
List: No
Hidden: No
And named it "Variants"

Then I went to my parent product into Custom Fields tab. Added that custom field choosed SKU in value dropdown list and hit "save".

Now I'm having a dropdown list with SKUs in it on a product page. But when I change its value it doesn't ajax update the price, just redirects browser to the child product url.

I made some investigation on this and found out that and found out that onchange event of the dropdown list generated triest to ajax-get details with these function:
VirtueMartControllerProductdetails::recalculate()
Passing it these data:


And this function just calculates the price of the parent product. Not the child one.
It never triest to access that $field[0]['custom_value'] to get the url of the child product. Neither it deals with quantity (which is another issue).

Please help me!

[q-styler]

Okay. Here's the solution that worked for me.
I'm not sure if it's the proper one, but since it works it's fine for me. Doublecheck all your functions after applying it.

Since $field[0]['custom_value'] didn't make any sense I went to the html code generation of that dropdown list.
It is located in this file: /administrator/components/com_virtuemart/models/customfields.php on line 765. In function VirtueMartModelCustomfields::displayType()

This file is very unclean and has a lot of comments. So I can presume that it's still under heavy development.

So find this piece of code:

Code Select Expand

foreach($uncatChildren as $k => $child){
$options[] = array( 'value' => JRoute::_('index.php?option=com_virtuemart&view=productdetails&virtuemart_category_id='.$virtuemart_category_id.'&virtuemart_product_id='.$child['virtuemart_product_id']) ,'text' =>$child['product_name']);
}

return JHTML::_('select.genericlist', $options,'field['.$row.'][custom_value]','onchange="window.top.location.href=this.options[this.selectedIndex].value" size="1" class="inputbox"', "value","text",
JRoute::_('index.php?option=com_virtuemart&view=productdetails&virtuemart_category_id='.$virtuemart_category_id.'&virtuemart_product_id='.$selected));

break;

This will generate you a dropdown list with "field[0][custom_value]" name and path to the child product as the value of each option.

And change it with these lines:

Code Select Expand

foreach($uncatChildren as $k => $child){
$options[] = array( 'value' => $child['virtuemart_product_id'] ,'text' =>$child[$value]);
}
// window.top.location.href=this.options[this.selectedIndex].value
return JHTML::_('select.genericlist', $options,'virtuemart_product_id[]','onchange="" size="1" class="inputbox"', "value","text",
JRoute::_('index.php?option=com_virtuemart&view=productdetails&virtuemart_category_id='.$virtuemart_category_id.'&virtuemart_product_id='.$selected));

break;

Please note that I removed the onchange javascript code and hid it in the comment since it still tries to redirect me.

I also changed 'text' =>$child['product_name'] to 'text' =>$child[$value] because I want this dropdown list to show not only product_name but the thing I selected in custom fields tab.

I'm really gratefull for anyone who will tell me if this was really bug, or I messed up with the code.

Thank you!