Encore\Admin\Form\Field\Mobile::render PHP Method

    public function render()
    {
        if (empty($this->format)) {
            $this->format();
        }
        $options = json_encode(['mask' => $this->format]);
        $this->script = <<<EOT

\$('#{$this->id}').inputmask({$options});
EOT;
        return parent::render();
    }