How to display dynamic navigation bar from blade template - php

Question

I have a navigation bar stored in the database, and I have a Controller witch lists the navbar for my template file.
$navbar=/*Query*/
return view('inc.template')->with('nav',$navbar);
I have other pages where I want to use the template with the navigation bar of course, but when I extend the template I get error message 'Undefined variable $nav'. I understand why I get this error message, because I don't returned the variable for the other page. So I need solution for this.. every idea is welcome!.
I have single product page, where I want to include the template with the navigation bar and also I will list the Single Product here.
I know I can copy the query code and paste it to the single product controller, but I believe this is not a good solution (repeating myself).
Thanks in advance for your ideas!

Answer 1

You need to check the View Composer which will help you do what you want : https://laravel.com/docs/8.x/views#view-composers (use the correct Laravel version).
In order to do this, you will need to create a new class that will be your view composer and then register it to the container of Laravel.
In your case, that would be something like this :
<?php
namespace App\Http\View\Composers;
use Illuminate\View\View;
class NavbarComposer
{
/**
* Create a new navbar composer.
*
* #return void
*/
public function __construct()
{
// If you need to do something when instanciating this view composer
}
/**
* Bind data to the view.
*
* #param \Illuminate\View\View $view
* #return void
*/
public function compose(View $view)
{
// here you can add as many variables that your navbar might need
// first parameter is the name of the variable and second the value.
$view->with('navbarData', []);
}
}
To register your view composer you can then do something like this :
View::composer('profile', ProfileComposer::class);
Maybe take a tour to https://www.laracasts.com to learn the basics of Laravel because that's not how to use routes.

Answer 2

I don't really understand your code, but I think this may help you:
If you want to get the variable in your non-yield blades, you can share your variable from controller's constructor, so don't need to add that in all methods. Just add this constructor method in your controller-class like this:
// ADD THIS >>>
public function __construct()
{
View::share('data', 'example');
}
// <<<
// YOUR EXISTING METHOD >>>
public function index()
{
return view('navbar');
}
// <<<
Now you can access $data variable in your blade, which are used in your appropriate page.
Don't forget to use this class in the top of controller's class:
use Illuminate\Support\Facades\View;

Answer 3

The simple answer is: you just need to return everything that belongs to your home.blade.php in the index function of the HomeController. You should do something like this:
public function index(){
$navbar = "Your query to get navbar data";
return view('home',[
'navbar' => $navbar
]);
}
Then call the navbar data into your home.blade.php ( or into the actual navbar.blade.php ) by using foreach.
Note: If you want to call the navbar in multiple views just call the navbar data from all the view returning functions as like index function.
UPDATE
To achieve that you can just do something as:
public function index(){
$navbar = "Your query to get navbar data";
if(count($navbar) == 0){
$navbar = "";
}
$slider = "Your query to get slider data";
if(count($slider) == 0){
$slider = "";
}
return view('home',[
'navbar' => $navbar,
'slider' => $slider,
]);
}