BrandFilterForm.php

<?php

/**
 * @package shop
 */
class BrandFilterForm extends Form {

	protected $currentFilter = [];

	public function __construct($controller, $name = "BrandFilterForm") {

		$this->currentFilter = Session::get('BrandFilter');

		parent::__construct(
			$controller,
			$name,
			$this->getFormFields(),
			$this->getFormActions()
		);

		$this->addExtraClass("brand-filter-form");

		$this->extend('updateBrandFilterForm');

		$this->setLegend('Brands');

		$this->disableSecurityToken();
	}

	public function filterbrands($data, $form) {
		$filters             = $data['Filters'];
		$this->currentFilter = $filters;
		if (empty($filters)) {
			Session::clear('BrandFilter');
		} else {
			Session::set('BrandFilter', $filters);
		}

		return $this->controller->redirectBack();
	}

	public function reset($data, $form) {
		Session::clear('BrandFilter');
		$this->currentFilter = [];
		
		return $this->controller->redirectBack();
	}

	/**
	 * @return FieldList Fields for this form.
	 */
	protected function getFormFields() {

		$fields = new FieldList();

		$fields->push(
			(new CheckboxSetField('Filters', '', ProductBrand::get('ProductBrand', 'Displayed=1')->map()->toArray(), $this->currentFilter))
				->setFieldHolderTemplate('BrandFilterCheckboxSetHolder')
		);

		return $fields;
	}

	/**
	 * @return FieldList Actions for this form.
	 */
	protected function getFormActions() {
		$fieldList = new FieldList(
			FormAction::create('filterbrands', 'Filter')
			          ->setUseButtonTag(true)
			          ->addExtraClass('btn btn-main')
			          ->setButtonContent('Filter')
		);


		if (!empty($this->currentFilter)) {
			$removeAction = new FormAction('removefilter', 'Clear');
			$removeAction->setUseButtonTag(true);
			$removeAction->addExtraClass('btn btn-compare pull-right');
			$removeAction->setButtonContent('Clear');
			$fieldList->push($removeAction);
		}

		return $fieldList;
	}

}