Prestashop: Attempted to call function "renderWidget" from the global namespace.

[Bonobomagno]

I tried to use the same pattern used on module/ps_shoppingcart/ajax
but this don't work.
So, how does this still work on ps_shoppingcart?

what i did?
used something like that in an ajax controller

header('Content-Type: application/json'); die(json_encode([ 'preview' => $this->module->renderWidget(null, ['cart' => $this->context->cart]), 'modal' => $modal ]));
This is actually ps_shoppingcart code, but renderWidget is not seen if used on custom modules controllers..

Additionnal information
PrestaShop version: 1.7.5
PHP version: 7.2

[khouloudbelguith]

Hi @Bonobomagno,

Thanks to follow this documentation: https://devdocs.prestashop.com/1.7/modules/concepts/widgets/ check & feedback.
Thanks!

[Bonobomagno]

I'm not talking about that
I just wanna make an ajax controller and found simpler to return the renderWidget function, as you use on ps_shoppingcart module.
This is fine on ps_shoppingcart controller but not on custom one.
Docs dont say nothing about calling $this->module->renderWidget(etc) from controllers

[khouloudbelguith]

ping @eternoendless @PrestaShop/prestashop-core-developers
Thanks!

[Matt75]

You can't use $this->module if you are not in a ps_shoppingcart controller.
You have to get the ps_shoppingcart module instance then call renderWidget on it.
So you can do that :

        /** @var Ps_Shoppingcart $ps_shoppingcart Instance of module ps_shoppingcart */
        $ps_shoppingcart = Module::getInstanceByName('ps_shoppingcart');
        die(json_encode([
            'preview' => $ps_shoppingcart->renderWidget(null, ['cart' => $this->context->cart]),
            'modal'   => $modal
        ]));

[Bonobomagno]

This is not what i want to use. I'm not searching to call module A function from module B controller,
Just want to call a module A function (renderWidget) from module A controller.
I saw this pattern used on ps_shoppingcart , but there are no way to reproduce this.

why i want this? Because it is a simple way to return a rendered template (the widget render a tpl with variables) as a json.

p.s.
btw i had the same result by just using $this->module->fetch(etc) as a json return on the ajax controller .
But i had to repeat the renderWidget logic

[Matt75]

Did you have this on your module class ?

<?php

if (!defined('_PS_VERSION_')) {
    exit;
}

use PrestaShop\PrestaShop\Core\Module\WidgetInterface;

class Yourgreatmodule extends Module implements WidgetInterface

[Bonobomagno]

sure ofc. the widgetRendering is working , so i can call it from the template.
but if i try to call it from the controller, i got this Attempted to call function "renderWidget" from the global namespace. error

[Bonobomagno]

The strange thing is that this module is the only official prestashop module that is using this way to render. So i dunno if ps_shoppingcart works thanks to an hack, or i did something bad

[Matt75]

Did you defined a namespace in your Module class or in your controller ?
I can't reproduce your problem so maybe you did something bad.

For example with ps_banner

<?php
// modules/ps_banner/controllers/front/ajax.php

class Ps_BannerAjaxModuleFrontController extends ModuleFrontController
{
    /** @var Ps_Banner Instance of module ps_banner */
    public $module;

    /**
     * @see FrontController::initContent()
     */
    public function initContent()
    {
        parent::initContent();

        ob_end_clean();
        header('Content-Type: application/json');
        die(json_encode([
            'preview' => $this->module->renderWidget(null, []),
        ]));
    }
}

index.php?controller=ajax&module=ps_banner&fc=module
{"preview":"<a class=\"banner\" href=\"http:\/\/localhost\/\" title=\"\">\n <img src=\"http:\/\/localhost\/modules\/ps_banner\/img\/sale70.png\" alt=\"\" title=\"\" class=\"img-fluid\">\n <\/a>\n"}

[Bonobomagno]

now it is just working.
cache issue? I'm using developer version on debug mode without cache and with recompile forced
Pretty strange way to act..
Thanks for the help btw.