Call function if Admin Option Changes?

[alexp999]

Hi,

I am working on an add-on and would like to clear out a cache directory if a setting changes.

I have seen that you can run a validation callback, is it possible to use this to determine if the value has changed?

i.e. I don't want to clear the cache directory everytime someone presses save in the ACP settings, only if this specific settings value has changed.

 

[Paul B]

Yes, that's exactly how you do it.
I do it for my FT add-on when the max value is changed:

 

[alexp999]

How do you compare the old and new value within that function?

 

[Chris D]

You have access to the $dw object, see XenForo_Option_TemplateFiles for an example.

You can do: $dw->getExisting('option_value') and compare that to $option or simply, $dw->isChanged('option_value');

 

[alexp999]

isChanged didn't seem to work, but getExisting did, so I have been able to create an if statement which does what I want.

Thanks for the help.