Change the value of a template variable after form submit

JHG

Hi,
since my PHP/Evo skills are not really advanced I could need a bit of help with this :-)

I would like to achieve the following scenario:
People send a form via FormLister. After the form is sent, a function changes the value of a certain template variable of the current document. Lets call the TV 'number'.
Every time someone submits the form, the value of the TV 'number' is increased by 1.

The goal is to automatically deactivate the form on the page after the 'number' is equal or higher than 20.
This could be achieved with the if snippet I think. But I need a starting point how to change values of template variables in the actual document with a PHP function.
I am already using a plugin for the form, very close to this one: https://forum.evo.im/d/173-safe-anti-spam-ajax-contactform-with-formlister

Next step would be to use this with multiTV, but that is probably even a bit more tricky.

Would be happy for any hints in the direction how to make a call to change the values of the TVs.

mplavala

Hi,
I assume you just want to have a form that can be sent 20 times and not any more. I don't know how to do this with TVs, but within PHP you should be able to fetch contents of a file on your server and also to write to that file - in other words rather than using a TV I would propose to use a file on the server and plain PHP: https://www.w3schools.com/php/php_file_open.asp
The only other option I can think of is using the DBAPI to directly write the new value into the database, but this may be overly complicated compared to the aforementioned method.

JHG

mplavala

Hi, thanks for the hint. But it needs to be something that can be changed easily in the manager.
Like 20 participants sent the form, but 2 informed us that they can't attend the class so the organizer/teacher can reduce the number in the TV to 18 again.

It's for the case more than 20 people subscribe to the class "over night" for example.

Everything should be connected to the manager UI, so non-techies can use it :-)

mplavala

JHG I see. In that case the standard thing would be to use eshop solution and have limited stock of "items". In such case user should be able to "restock" the item via the UI. For Evo there is Shopkeeper, but I never used it so I cannot help more.

If you want to go with the original solution, then manipulating the database via the DBAPI is likely the only solution I can think of.

fourroses666

Hmm, Shopkeeper is very old, Commerce is a better solution.
But it would still be custom. (should be possible I guess with some plugin/snippet/custom php but I'm not a programmer).