Nette\Forms\Controls\BaseControl::loadHttpData PHP Method

    public function loadHttpData()
    {
        $this->setValue($this->getHttpData(Form::DATA_TEXT));
    }

 public function loadHttpData()
 {
     parent::loadHttpData();
     if ($this->value) {
         $this->onUpload($this, $this->value);
     }
 }