[SOLVED] CHECKBOX ELEMENT: HOW TO LIMIT CHECKED QUANTITY

[kaito]

Hi to everybody:

For a checkbox element I want to set a maximum value for checked items.

I looked for in the forum and found this post: https://fabrikar.com/forums/index.php?threads/howto-limit-the-number-of-selections-for-checkbox-element.20557/
using a PHP validation based in counting separator character of the values stored in the element value, I set PHP validation for a maximum of 3 items checked, so there will be a maximum of 3-1=2 separator characters:

If ("substr_count({afab_votacioncursotipo01___comocalificariasalponente_raw}","-") > 2)
   {
   return false;
   }
else {
   return true;
   }

I have tried with different separator characters as "-" or "," with no efect, when I try to run the form, there is a validating icon appearing with no end.

Is there any way to know the syntax about how checkbox element stores temporally checked values? If I know it, then I can look for that separator caharacter using substr_count function.

Or is there any other way to set a maximum value for checked options?

Thanks in advance,

kaito

 

[lousyfool]

The post you're referring to is soon 10 years old.

Instead, in the "PHP code" field of the PHP validation plugin, enter this:

return count($formModel->formData['afab_votacioncursotipo01___comocalificariasalponente']) <= 3;

 

[kaito]

It works perfect.
Thanks lousyfool !!

 

[mvilela]

Joomla 4.3.2, FabriK Gamma 3, PHP 8.1
Reports the following error:
count(): Argument #1 ($value) must be of type Countable|array, null given

 

[troester]

So make sure that your element is not empty before calling it in your custom code.