Method setup

/**
 * Method to attach a Form object to the field.
 *
 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
 * @param   mixed              $value    The form field value to validate.
 * @param   string             $group    The field name group control value. This acts as as an array container for the field.
 *                                       For example if the field has name="foo" and the group value is set to "bar" then the
 *                                       full field name would end up being "bar[foo]".
 *
 * @return  boolean  True on success.
 *
 * @since   1.7.0
 */
public function setup(\SimpleXMLElement $element, $value, $group = null)
{
    // Make sure there is a valid FormField XML element.
    if ((string) $element->getName() !== 'field') {
        return false;
    }
    // Reset the input and label values.
    $this->input = null;
    $this->label = null;
    // Set the XML element object.
    $this->element = $element;
    // Set the group of the field.
    $this->group = $group;
    $attributes = array('multiple', 'name', 'id', 'hint', 'class', 'description', 'labelclass', 'onchange', 'onclick', 'validate', 'pattern', 'validationtext', 'default', 'required', 'disabled', 'readonly', 'autofocus', 'hidden', 'autocomplete', 'spellcheck', 'translateHint', 'translateLabel', 'translate_label', 'translateDescription', 'translate_description', 'size', 'showon');
    $this->default = isset($element['value']) ? (string) $element['value'] : $this->default;
    // Set the field default value.
    if ($element['multiple'] && \is_string($value) && \is_array(json_decode($value, true))) {
        $this->value = (array) json_decode($value);
    } else {
        $this->value = $value;
    }
    // Lets detect miscellaneous data attribute. For eg, data-*
    foreach ($this->element->attributes() as $key => $value) {
        if (strpos($key, 'data-') === 0) {
            // Data attribute key value pair
            $this->dataAttributes[$key] = $value;
        }
    }
    foreach ($attributes as $attributeName) {
        $this->__set($attributeName, $element[$attributeName]);
    }
    // Allow for repeatable elements
    $repeat = (string) $element['repeat'];
    $this->repeat = $repeat === 'true' || $repeat === 'multiple' || !empty($this->form->repeat) && $this->form->repeat == 1;
    // Set the visibility.
    $this->hidden = $this->hidden || strtolower((string) $this->element['type']) === 'hidden';
    $this->layout = !empty($this->element['layout']) ? (string) $this->element['layout'] : $this->layout;
    $this->parentclass = isset($this->element['parentclass']) ? (string) $this->element['parentclass'] : $this->parentclass;
    // Add required to class list if field is required.
    if ($this->required) {
        $this->class = trim($this->class . ' required');
    }
    return true;
}