Why do I always get undefined variable error even though I'm passing the variable correctly to-CodePudding

Why do I always get Undefined variable $var error? I'm trying to work with one view only (my_view.blade.php) but for some reason, when I navigate to http://127.0.0.1:8000/ I get the aforementioned error.

My intention's to make the $var variable available in the view so I can use it in the blade file. This variable gets populated only when the user enters text and submits but for some reason, I can't even get to part where I can see the text input field because this file gets thrown upon loading the view. If I get rid {{ $var }}, everything works as intended.

I thought this whole time I'm doing it correctly in terms of passing a variable to the view. What am I doing wrong?

controller:

public function addVar(Request $request) {
    $var = $request->get('var');

    Url::create([
        'var' => $var
    ]);
    
    view('my_view', compact('var'));

    return Redirect::back();
}

web.php:

Route::get('/', function () {
    return view('my_view');
});

Route::post('/add-var', [MyController::class, 'addVar'])->name('add-var');

my_view.blade.php:

{{ $var }}

<form method="POST" action="{{ route('add-var') }}">
    {{csrf_field()}}
    <input type="text" name="var" placeholder="Enter text"/>
    <button type="submit" >Submit</button>
</form>

CodePudding user response：

If you wanna the two routes do the same thing

In web.php:

Route::get('/', [MyController::class, 'addVar']);

Route::post('/add-var', [MyController::class, 'addVar'])->name('add-var');

In my_view.blade.php:

{{ $var ?? '' }}

<form method="POST" action="{{ route('add-var') }}">
    {{csrf_field()}}
    <input type="text" name="var" placeholder="Enter text"/>
    <button type="submit" >Submit</button>
</form>

CodePudding user response：

can you change

$var = $request->get('var');

$var = $request->var;