Laravel 8: How to share a PHP variable with different pages (using same layout) and components?-CodePudding

I am working on this web app (Laravel 8) in which users can choose their color themes. Basically, to make it simple, let's say each user can choose their primary_color.

On home page (which does not need authentication), the primary_color will come from config (whether user is authenticated or not). On authenticated pages, the primary_color comes from the users table (for the authenticated user). I also have a bunch of pages that use the guest layout if user is not authenticated, and the app layout if user is authenticated. Those would use the primary_color from config if user is not authenticated, and the primary_color chosen by the user if they are authenticated.

All those pages use some components (buttons, nav-links, etc) that need to know the primary_color.

I currently have this line on top of EACH php file that needs to know the primary_color:

$primary_color = (Auth::user() && Route::current()->getName() !== 'home') ? Auth::user()->config->color_theme : "yellow";

(Color "yellow" is hard coded here, just ignore it.)

I would love to avoid that much code replication, but i can't seem to find a way to share this variable from the layout (guest.blade.php or app.blade.php) to the page. I can't seem to be able to include a style.blade.php view that contains the variable, either. The variables declared in this included view do not exist in the rest of the page. I managed to pass the variable to components using a prop. It's not so nice, but it works fine. But it's not so nice, i'd rather use a cleaner solution.

But most importantly, how do i avoid having to copy the same bit of code on top of each page?

Thank you!

CodePudding user response：

If you want to share data with all the views you can use laravel's view composer. it can attach data to all view or multiple views simultaneously. source: https://laravel.com/docs/5.0/views#view-composers alternately: see here https://www.digitalocean.com/community/tutorials/sharing-data-between-views-using-laravel-view-composers

CodePudding user response：

You can use view composers. Under the boot method of AppServiceProvider add the folowing code.

\Illuminate\Support\Facades\View::composer('*',function($view){
            $userPrimaryColor = (Auth::user() && ! Route::is('home')) ? Auth::user()->config->color_theme : "yellow";
            $view->with('primary_color', $userPrimaryColor);
        });

The first argument * indicates that it needs to be shared to all the views. If you need those in few pages you can pass the list of pages as array