Proper template override of characteristic display

-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.3.24

I want to add an onchange function to the select that changes the variant. I looked into the file /administrator/com_hikashop/types/characteristic.php. On line 257 where it reads:

I wanted to add a function so that it reads:

I've created the function in a view file and it is present in the page source code. I read the documentation at www.hikashop.com/support/support/documen...tation.html#override . I copied the file at /administrator/com_hikashop/types/characteristic.php and pasted it into /templates/MY_TEMPLATE/html/hikashop_characteristics.php and made the change I mentioned above, but it's not working. I'm sure there's more involved that I'm not doing. Any help would be appreciated.

The documentation doesn't say that you should copy/paste that file.
It says that you need to create a hikashop_characteristics.php file and in it develop a function hikashop_characteristics_html(&$element,&$params,&$obj) and that to understand what you need to put in it, you'll want to look at the code in administrator/com_hikashop/types/characteristic.php
It actually won't be that easy.

In your case, I would do something different and not use the characteristic display override.
Instead, edit the file "show_block_characteristic" via the menu Display>Views, and change the line:
echo $this->characteristic->displayFE($this->element, $this->params) . '</div>';

to:
echo str_replace('return hikashopUpdateVariant(this);','return hikashopUpdateVariant(this);hikashopNoStockNoPrice();',$this->characteristic->displayFE($this->element, $this->params)) . '</div>';

That way, it's still done as an override, and even if you update HikaShop, you still use the standard characteristic system with just that JS function call added.

Thanks nicolas,
I saw the line of code you mentioned, but just did not think anything about a str_replace. Very simple fix. Worked perfect