If no checkbox is checked, display an error message - Laravel

I tried a couple of things to display an error message. The idea is that the user can add tags to his products. On my main view is a table with all products listed. Every line of the table have his own a checkbox and the user can select any product he want, to add some tags to these products on the next page.

My problem is, I want to display a flash message that tells the user, he haven't checked any checkboxes. Nothing more then that. Currently he gets directed to the next page with no product selected.

---

My tries

Thats the controller function, the user getting directed to, if he submits the form.

public function edit() {

// some non important controller code 
if(count(Input::get('id')) == 0)
{
    Session::flash('danger', 'Sie haben kein Produkt gewählt!');
    return redirect()->back();
}
else
{
    return view('layout.edit.productedit', [
        'ids' => $data,                  // non important variables
        'products' => $product_name        
    ]);
}

}

and in my view:

@if (Session::has('danger'))
    <div class="alert alert-danger"></div>
@endif

That didn't worked so well. The user gets his error message displayed but if he does everything right, the next page also gets this error message AND the tagging request doesn't work anymore.

So I need another way to check if the user has selected any checkbox and tell him, he need's to select at least a single checkbox to continue adding tags.

Maybe with a Javascript/Jquery solution or another way in laravel.

Thanks for taking your time and I'm sorry for my bad english.