Get template params from the input

Question

Previously I was looking into how to get the template I'm currently editing, now I need to make use of a templates/templateName/helper.php file which would need a different kind of request.

// this gets me the template
$app = Factory::getApplication('site');
$template = $app->input->getValue('template');

Question:

How can I get the params from the input for the known $template?

Answer 1

If you want to access the parameters of a specific template inside the Helper, you could write a small database query, like so:

use Joomla\CMS\Factory;
use Joomla\Registry\Registry;

class TplCassiopeiaHelper
{
    private $params = null;

    public function __construct()
    {
        $this->params = $this->getParams();

        // You can now access specific parameters, inside the class, for example:
        // $this->params->get('colorName')
    }

    protected function getParams()
    {
        $db = Factory::getDbo();

        $db->setQuery(
            $db->getQuery(true)
                ->select('params')
                ->from('#__template_styles')
                ->where('template = ' . $db->q('cassiopeia'))
                ->where('client_id = 0')
        );
        $registry = new Registry;
        $registry->loadString($db->loadResult());

        return $registry;
    }
}

Or, when you instantiate the helper class, you could pass $this->params as a constructor argument.

Answer 2

You can do it like this example:

$this->params->get('sitedescription'))

In this instance my XML looks like this:

<config>
    <fields name="params">
        <fieldset name="advanced">
            <field name="sitedescription"
                   type="text"
                   default=""
                   label="JGLOBAL_DESCRIPTION"
                   description="JGLOBAL_SUBHEADING_DESC"
                   filter="string"/>
            <field name="framework" type="list" default="bootstrap4" required="true" label="TPL_STARTER_BOOTSTRAP_4_LABEL" description="TPL_STARTER_BOOTSTRAP_4_DESCRIPTION">
                <option value="">TPL_STARTER_BOOTSTRAP_4_DEFAULT_OPTION</option>
                <option value="bootstrap4">Bootstrap4</option>
                <option value="foundation6">Foundation 6</option>
            </field>
        </fieldset>
    </fields>
</config>