I jsut looked at SE simple code and I woudl say this tempalte si not 100% compatible withj joomla3, e.g. it uses JRegistry class which is gone in J3, also it does some transformations to output conditional fields. Try using Minima template instead.

Hello Klas,

thank you for taking a look.

I'm using that template on a J! 2.5 site. So JRegistry class shouldn't be a problem.

Even if I change simple simon  index.php, lne 6+7 from

$cck = new SdRendering;
$cck->getInstance( $this->template );

to

$cck    =    CCK_Rendering::getInstance( $this->template );

which is the original code from seb_one index.php,

it doesn't change the behaviour. Which is strange because then the template is not using the custom class "SdRendering" at all.

Anyways, I will try minima template.

I tried Minima template but still the conditional JS code is not being rendered. Why is that?

Code for validation is there in my HTML.

Any pointers towards a solution would be much appreciated. Thank you.

Same result with seb_one template and no template/position overrides in place.

Found the problem. Was my own fault.

I'm using  /templates/seb_one/fields/markup.php to customize my field output.

In the original _markup.php there are these lines

    // Computation
    if ( isset( $field->computation ) && $field->computation ) {
        $cck->setComputationRules( $field );
    }
    // Conditional
    if ( isset( $field->conditional ) && $field->conditional ) {
        $cck->setConditionalStates( $field );
    }

They where missing in my markup.php. After pasting them there, conditional code is now being rendered in the HTML.