Cannot access Blade Component variables inside the view - php

Question

I have been running into this very weird issue with Laravel.
I had a problem where one of my component views was not able to read the variables defined in its class.
It was kind of strange because I have several components running in my project and they all worked fine, except for this one.
So I created a fresh Laravel project to test some things out (Wanted to check if the problem was on my end, maybe I somehow messed up the project files).
I created a new component on a blank project using php artisan make:component Test
Then I simply added a test variable to the class component like so:
<?php
namespace App\View\Components;
use Illuminate\View\Component;
class Test extends Component
{
public $test;
/**
* Create a new component instance.
*
* #return void
*/
public function __construct()
{
$this->test = "testing";
}
/**
* Get the view / contents that represent the component.
*
* #return \Illuminate\View\View|string
*/
public function render()
{
return view('components.test');
}
}
And tried to access it over in the view like so:
<div>
<p> {{$test}} </p>
</div>
For some reason, this is not working and I can't figure out why. It just says that $test is undefined.
Perhaps I should point out, I am a beginner in Laravel, so excuse me if I am making some obvious mistake. It just seemed weird that this is not working on a blank project.
Thank you in advance.

Answer 1

In fact, all of the answers are misleading. The $test property is already public, and as such available to the template. Please don't go and manually add parameters to the view.
I just encountered a similar issue, and while I can say for sure that it has to do with the component class name, I could not trace it down, because it started working again magically.
What I can say about it is:
I had a class with the same base classname but a different namespace, deleted the non-component class, and then suddenly the component was rendered as an anonymous component, by-passing the component class completely. (You can easily verify that by putting a dd() in your component class constructor.)
My first thought was that the autoloader needed a refresh, but composer dump did not change anything.
renaming the component class and template to something else solved the issue.
when I wanted to track down the bug, I renamed the class and template back to the original name, but now it suddenly worked...
my guess is that the view cache was causing the issue. It worked from the moment when I was changing the x-blade (<x-component-name ... />) in the template that was including the component. So it is plausible that the issue magically went away because the cached view was replaced due to the template change.
So based on this, your best options to solve the issue are:
Verify that your properties are public, they will not be available in your template if they are protected or private.
Clear caches, esp. the view cache (php artisan view:clear).
Dump the autoloader (composer dump).
Verify that your class is actually used. Put a dd() in your constructor. If you still get errors from the template, Blade is by-passing your class and trying to use your template as an anonymous component.
Rename the component to something else to see if the class name clashes.
Hope that helps anyone who experiences this confusing issue.

Answer 2

In my case It was because of cached view so php artisan view:clear did the job
so what is wrong?
The problem happens when you already have a view component and in some point you want to add a dedicated class to provide some data to your component and because laravel already cached your component the "dedicated class" wont be triggered

Answer 3

You need to send variable to the view. Some ways
In an array
$test = 'Hi';
return view('components.test', ['test' => $this->test]);
Using with
$test = 'Hi';
return view('components.test')->with('test', $test);
The last one, i like it this one.
$test = 'Hi';
return view('components.test', compact('test'));
Let me know how it works, regards.

Answer 4

within the render() function, instead of return view('components.test');, do return view('components.test', ['test' => $this->test])