Cannot add any stylesheets to module in prestashop 1.7 - php

Question

I've encountered problem with adding any stylesheets to prestashop front office. I was reading multiple articles, tried multiple solutions and I can't get it to work. Adding styles to back office was not a problem (but that this code for adding styles to back office is workaround I think). Here is the module code. (I've added stylesheet import in multiple places to check every solution. In other modules this methods works as intended). Sorry for messy code I'm not that good in PHP.
<?php
if (!defined('_PS_VERSION_'))
exit();
class PromotionBanner extends Module
{
public function __construct()
{
$this->name = 'promotionbanner';
$this->tab = 'front_office_features';
$this->version = '1.0.0';
$this->author = 'example';
$this->author_uri = 'https://example.com';
$this->ps_versions_compliancy = array('min' => '1.7.1.0', 'max' => _PS_VERSION_);
$this->bootstrap = true;
$this->need_instance = 0;
$this->dir = '/modules/promotionbanner';
$this->css_path = Tools::getShopDomainSsl(true, true) . __PS_BASE_URI__ . 'modules/' . $this->name
. '/' . $this->_path . 'views/css/';
parent::__construct();
$this->displayName = $this->l('Promotion Banner', 'promotionbanner');
$this->description = $this->l('This module provides configurable promotion banner on your website');
$this->confirmUninstall = $this->l('Are you sure you want to uninstall the module?', 'promotionbanner');
}
private function updateConf()
{
Configuration::updateValue('banner_text', $this->l('Wybrane produkty tańsze o 15%! Kod rabatowy: '));
Configuration::updateValue('banner_coupon_code', $this->l('Wybierz kupon rabatowy'));
}
public function install()
{
$this->updateConf();
return parent::install() && $this -> registerHook('displayWrapperTop') && $this->registerHook('header');
}
public function uninstall()
{
if (!parent::uninstall() || !Configuration::deleteByName('promotionbanner_module') &&
!Configuration::deleteByName('banner_coupon_code'))
return false;
return true;
}
public function hookDisplayWrapperTop($params)
{
$this->context->smarty->assign(
array(
'banner_text' => Configuration::get('banner_text'),
'banner_coupon_code' => Configuration::get('banner_coupon_code')
)
);
$this->context->controller->registerStylesheet(
'modules-promotion-banner2', //This id has to be unique
'modules/'.$this->name.'/views/css/front.css',
array('media' => 'all', 'priority' => 150)
);
return $this->display(__FILE__, 'promotionbanner.tpl');
}
public function hookHeader() {
$this->context->controller->addCSS($this->_path . 'views/css/front.css', 'all');
$this->context->controller->registerStylesheet(
'modules-promotion-banner', //This id has to be unique
'modules/'.$this->name.'/views/css/front.css',
array('media' => 'all', 'priority' => 150)
);
}
public function hookActionFrontControllerSetMedia($params) {
$this->context->controller->registerStylesheet(
'module-promotionbanner-style',
'modules/'.$this->name.'/views/css/front.css',
[
'media' => 'all',
'priority' => 200,
]
);
}
public function getPromotions()
{
$cart_rule = _DB_PREFIX_ . 'cart_rule';
$request = "SELECT $cart_rule.id_cart_rule, " . _DB_PREFIX_ . "cart_rule_lang.name, $cart_rule.code " .
"FROM $cart_rule INNER JOIN " . _DB_PREFIX_ . 'cart_rule_lang ON ' . _DB_PREFIX_ . 'cart_rule.id_cart_rule='
. _DB_PREFIX_ . 'cart_rule_lang.id_cart_rule WHERE ' . _DB_PREFIX_ . 'cart_rule.code IS NOT NULL';
$db = Db::getInstance();
$cupons = $db->executeS($request);
$parsedCupons = array();
foreach ($cupons as $cupon) {
array_push($parsedCupons, array(
'code' => $cupon['code'],
'name' => $cupon['name']
));
}
return $parsedCupons;
}
public function displayForm()
{
$form = $this->renderForm();
$this->context->smarty->assign(array(
'banner_text' => Configuration::get('banner_text'),
'banner_coupon_code' => Configuration::get('banner_coupon_code'),
'form_url' => AdminController::$currentIndex . '&configure=' . $this->name . '&token=' . Tools::getAdminTokenLite('AdminModules'),
'name' => $this->name,
'form_tpl' => $form,
'coupon_codes' => $this->getPromotions()
));
$this->context->controller->addCSS(array(
$this->css_path . 'fontawesome-all.min.css',
$this->css_path . 'module.css'
));
$this->output = $this->context->smarty->fetch($this->local_path . 'views/templates/admin/menu.tpl');
return $this->output;
}
public function renderForm()
{
$helper = new HelperForm();
$helper->module = $this;
$helper->name_controller = $this->name;
$helper->token = Tools::getAdminTokenLite('AdminModules');
$helper->currentIndex = AdminController::$currentIndex . '&configure=' . $this->name;
$helper->title = $this->displayName;
$helper->show_toolbar = false;
$helper->toolbar_scroll = false;
$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'),
)
);
$helper->fields_value = array(
'banner_text' => Configuration::get('banner_text'),
'banner_coupon_code' => Configuration::get('banner_coupon_code')
);
return $helper->generateForm(array($this->getConfigForm()));
}
public function getConfigForm()
{
$fields_form = array(
'form' => array(
'input' => array(
array(
'type' => 'text',
'label' => $this->l('Banner text before code: '),
'name' => 'banner_text',
'lang' => false,
'required' => true,
'size' => 20
),
array(
'type' => 'select',
'label' => $this->l('Coupon code: '),
'name' => 'banner_coupon_code',
'required' => true,
'options' => array(
'query' => $this->getPromotions(),
'id' => 'code',
'name' => 'name'
)
)
),
'submit' => array(
'title' => $this->l('Save'),
'class' => 'btn btn-default pull-right'
)
)
);
return $fields_form;
}
public function getContent()
{
$output = "";
if (Tools::isSubmit('submit' . $this->name)) {
$banner_text = strval(Tools::getValue('banner_text'));
$banner_coupon_code = strval(Tools::getValue('banner_coupon_code'));
if (!isset($banner_text) || !isset($banner_coupon_code))
$output .= $this->displayError($this->l('Please insert something in this field.'));
else {
Configuration::updateValue('banner_text', $banner_text);
Configuration::updateValue('banner_coupon_code', $banner_coupon_code);
$output .= $this->displayConfirmation($this->l('Field updated successfully!'));
}
}
return $output . $this->displayForm();
}
}

Answer 1

Okay so I've managed to successfully register the stylesheet in the prestashop 1.7.6.1. But I think this is a good time to mention some of my mistakes and address some of the problems.
Checklist of registering a stylesheet in front office
Use correct hook for the job.
My problem has been unsolved because I've used a wrong hook.
Make sure that your __construct() registered a official hook for registering stylesheets (prestashop 1.7.x). The correct hook is: $this->registerHook('actionFrontControllerSetMedia'); you can find official docs here (If you don't have front controller in your module): https://devdocs.prestashop.com/1.7/themes/getting-started/asset-management/#without-a-front-controller-module
Make sure that you registered your hook function with $params (I don't know why but it doesn't work without a function parameter defined... This also stopped me from successfull register). The proper function should look like this:
$this->context->controller->registerStylesheet(
'stylesheet-id', //This id has to be unique
'modules/'.$this->name.'/views/css/front.css',
array('server' => 'local', 'priority' => 10)
);
}
As #bakis mentioned. After every try clear your browser cache + prestashop cache for chrome or chromium users I would suggest to disable the browser cache in inspector window completely.
I know that $this->context->controller->addCSS still exists, but this function is useful only for back office stylesheet register. Even the official docs are saying about it
Backward compatibility is kept for the addJS(), addCSS(), addJqueryUI() and addJqueryPlugin() methods.
That's pretty much everything about this question. I hope it will help someone in the future who is searching for answer.