Add extra markup to an inputfield

[Frank Vèssia]

I'd like to add extra markup to a specific inputfield text in the admin using a module, I tried an hook like this but pw says the method doesn't exist
 

$this->addHookBefore('Inputfield::render', $this, "addMarkup");

 
protected function addMarkup($event){
    $Inputfield = $event->object;
    if($Inputfield->attr('name') == "myfieldname"){
         
        $Inputfield->setMarkup([
            'item_content' => "my markup"
        ]);
           
    }
}

[bernhard]

If you hook the render() method, the $event->return contains the markup. Therefore you need to modify $event->return to modify the markup:

[Frank Vèssia]

nice, thanks bernhard!

[gmclelland]

@bernhard off topic, but what is RockBodyBuilder?