how to redirect and show error validateion in laravel

good day, I new in laravel Framework and I face this two problems : -
first one
I want to redirect to my page after 2 seconds automatically.
the second one
I make custom function call (is exist ) if this function returns true data I want to print "name exist before " but the problem here is form was rested when this function returns true and print message. how to prevent form resetting from inputs value? here is my code

controller code

enter code here
public function add(Request $request)

{
        // start add
    if($request->isMethod('post'))
    {
        if(isset($_POST['add']))
        {
            // start validatio array
        $validationarray=$this->validate($request,[
            //'name'  =>'required|max:25|min:1|unique:mysql2.products,name|alpha',
            'name'  =>'required|alpha',
            'price' =>'required|numeric',

            ]);
                // check name is exist

            if(true !=dBHelper::isExist('mysql2','products','`status`=? AND `deleted` =? AND `name`=?',array(1,1,$validationarray['name'])))
            {

                $product=new productModel();
                // start add
                $product->name=$request->input('name');
                $product->save();
                $add=$product->id;
                $poducten=new productEnModel();
                $poducten->id_product=$add;
                $poducten->name=$request->input('name');
                $poducten->price=$request->input('price');
                $poducten->save();
                $dataview['message']='data addes';




            }else{
                $dataview['message']='name is exist before';
            }

        }
    }
    $dataview['pagetitle']="add product geka";
    return view('productss.add',$dataview);
}

this is my routes

Route::get('/products/add',"produtController@add");
    Route::post('/products/add',"produtController@add");

this is my view

@extends('layout.header')
@section('content')
    @if(isset($message))
        
    @endif

    @if(count($errors)>0)
        <div class="alert alert-danger">
            <ul>
              @foreach($errors->all() as $error)
                  <li></li>

                  @endforeach

            </ul>

        </div>
        @endif

    <form role="form"  action="add" method="post" enctype="multipart/form-data">
        
        <div class="box-body">
            <div class="form-group">
                <label for="exampleInputEmail1">Employee Name</label>
                <input type="text" name="name" value="" class="form-control" id="" placeholder="Enter Employee Name">
            </div>

            <div class="form-group">
                <label for="exampleInputEmail1">Email Address</label>
                <input type="text" name="price" value="" class="form-control" id="" placeholder="Enter Employee Email Address">
            </div>
        </div>
        <!-- /.box-body -->
        <div class="box-footer">
            <button type="submit" name="add" class="btn btn-primary">Add</button>
        </div>
    </form>

@endsection

via Chebli Mohamed