Module Configuration menu: selection

[marktomm90]

Hi, 

 

I have read prestashops' docs and searched the internet and couldn't find the answer.

 

The prestashop tutorial on making a custom module shows how to change one value in module configuration menu. I am trying to make a <selection multiple="multiple"> type form to select

multiple items from it and store them in a variable (DC_CATEGORIES) for later use.

 

Unfortunately I am unable to accomplish this.

 

Here is my code

    public function getContent()
    {
	$output = null;

	if (Tools::isSubmit('submit'.$this->name))
	{
		$my_module_name = array();
		$my_module_name = unserialize(base64_decode(Tools::getValue('DC_CATEGORIES')));
		if (!$my_module_name  || empty($my_module_name))
			$output .= $this->displayError( $this->l('Invalid Configuration value'.$my_module_name) );
		else
		{
			Configuration::updateValue('DC_CATEGORIES', base64_encode(serialize($my_module_name)));
			$output .= $this->displayConfirmation($this->l('Settings updated'));
		}
	}
	return $output.$this->displayForm();

    }
    
    public function displayForm()
    {
	// Get default Language
	$default_lang = (int)Configuration::get('PS_LANG_DEFAULT');
	
	$categoriesData = Category::getCategories( 0, true, false );
	$categories = array();
	foreach($categoriesData as $category)
        {
            array_push($categories, array(
		'id_option' => $category['id_category'],
                'name' => $category['name']
            ));
        }
		
		
	// Init Fields form array
	$fields_form[0]['form'] = array(
		'legend' => array(
			'title' => $this->l('Settings')
		),
		'input' => array(
			array(
				'type' => 'select',
				'label' => $this->l('Set Categories'),
				'name' => 'DC_CATEGORIES',
				'multiple' => 'multiple',
				'options' => array(
					'query' => $categories,
					'id' => 'id_option',
					'name' => 'name'
				)
			)
		),
		'submit' => array(
			'title' => $this->l('Save'),
			'class' => 'button'
		)
	);
	
	$helper = new HelperForm();
	
	// Module, token and currentIndex
	$helper->module = $this;
	$helper->name_controller = $this->name;
	$helper->token = Tools::getAdminTokenLite('AdminModules');
	$helper->currentIndex = AdminController::$currentIndex.'&configure='.$this->name;
	
	// Language
	$helper->default_form_language = $default_lang;
	$helper->allow_employee_form_lang = $default_lang;
	
	// Title and toolbar
	$helper->title = $this->displayName;
	$helper->show_toolbar = true;        // false -> remove toolbar
	$helper->toolbar_scroll = true;      // yes - > Toolbar is always visible on the top of the screen.
	$helper->submit_action = 'submit'.$this->name;
	$helper->toolbar_btn = array(
		'save' =>
		array(
			'desc' => $this->l('Save'),
			'href' => AdminController::$currentIndex.'&configure='.$this->name.'&save'.$this->name.
			'&token='.Tools::getAdminTokenLite('AdminModules'),
		),
		'back' => array(
			'href' => AdminController::$currentIndex.'&token='.Tools::getAdminTokenLite('AdminModules'),
			'desc' => $this->l('Back to list')
		)
	);
	
	// Load current value
	$helper->fields_value['DC_CATEGORIES'] = Configuration::get('DC_CATEGORIES');
	
	return $helper->generateForm($fields_form);
    }

I tryed using base64_encode/decode because otherwise I would get the 'Error at offset' error

(http://davidwalsh.name/php-serialize-unserialize-issues)

 

Thanks in advance.