class.ilCharSelectorRadioGroupInputGUI.php

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<?php

class ilCharSelectorRadioGroupInputGUI extends ilRadioGroupInputGUI
{
    public function __construct(
        string $a_title = "",
        string $a_postvar = ""
    ) {
        global $DIC;

        parent::__construct($a_title, $a_postvar);
        $this->lng = $DIC->language();
    }

    public function checkInput(): bool
    {
        $lng = $this->lng;
        if (!parent::checkInput()) {
            return false;
        }

        if ($this->int('char_selector_availability') === ilCharSelectorConfig::ENABLED
            && trim(implode("", $this->strArray('char_selector_blocks'))) === ""
            && trim($this->str('char_selector_custom_items')) === '') {
            $this->setAlert($lng->txt("char_selector_msg_blocks_or_custom_needed"));
            return false;
        } else {
            return true;
        }
    }
}