script stops working on second loop(modal)

I have a script to add or remove a number. This is working on the first modal but on the second model it stops working. I think it might have to do with the window onload taking the first id and then the second time it stops? How to solve this ? if i make the id’s variable the script will not find the id’s…

script

window.onload=function(){
    var minusBtn = document.getElementById("minus"),
        plusBtn = document.getElementById("plus"),
        numberPlace = document.getElementById("numberPlace"),
        submitBtn = document.getElementById("submit"),
        number = 0, /// number value
        min = 0, /// min number
        max = 30; /// max number

    minusBtn.onclick = function(){
        if (number>min){
            number = number-1; /// Minus 1 of the number
            numberPlace.innerText = number ; /// Display the value in place of the number

        }
        if(number === min) {
            numberPlace.style.color= "red";
            setTimeout(function(){numberPlace.style.color= "black"},500)
        }
        else {
            numberPlace.style.color="black";
        }

    }
    plusBtn.onclick = function(){
        if(number<max){
            number = number+1;
            numberPlace.innerText = number ; /// Display the value in place of the number
        }
        if(number === max){
            numberPlace.style.color= "red";
            setTimeout(function(){numberPlace.style.color= "black"},500)
        }

        else {
            numberPlace.style.color= "black";

        }


    }
    submitBtn.onclick = function(){

        if (number > 1){
            alert( number + " items " + " has been added to basket");
        }else{
            alert( number + " item " + " has been added to basket");
        }
    }

}

Laravel blade page (see id Maindiv)

@extends('frontend.index')
@section('content')
    @foreach($products as $product)
        <article class="col-12 col-lg-3 d-flex justify-content-center mb-2 sbcard1 ">

            <div class="card text-center sbcardhome" style="width: 18rem;">
                <a href="{{route('frontend.detailpage', $product)}}"><img
                        src="{{$product->photo ? asset($product->photo->file) : 'http://via.placeholder.com/62'}}"
                        class="card-img-top img-fluid" alt="{{$product->name}}"></a>
                <div class="card-body">
                    <a id="brownbear" href="{{route('frontend.detailpage', $product)}}"><h5
                            class="card-title fs-6">{{$product->name}}</h5></a>
                    <a id="brownbearprice" href="{{route('frontend.detailpage', $product)}}"><p
                            class="card-text fw-bold">&#8364; {{$product->price}}</p></a>

                    <button type="button" class="btn btn-danger text-center mt-lg-3">Add To Cart</button>

                    <div class="box1" id="ease-in1">
                        <ul class="add-to-links1">
                            <li class="mb-3">
                                <a title="Add to wishlist" href="#"><i class="bi bi-heart  text-black"></i></a>
                            </li>

                            <li class="compare mb-3">
                                <a title="Add to compare" href="#" class=""><i
                                        class="bi bi-arrow-clockwise   text-black"></i></a>
                            </li>

                            <li class="quick-view mb-1">
                                <a data-bs-toggle="modal" data-bs-target="#staticBackdrop{{$product->id}}"
                                   title="Quick view" class="quick_view" href="#"><i
                                        class="bi bi-eye text-black"></i></a>
                            </li>
                        </ul>

                        <div class="modal fade" id="staticBackdrop{{$product->id}}" data-bs-backdrop="static"
                             data-bs-keyboard="false" tabindex="-1"
                             aria-labelledby="staticBackdropLabel{{$product->id}}" aria-hidden="true">
                            <div class="modal-dialog modal-lg">
                                <div class="modal-content">
                                    <div class="modal-header">
                                        <h5 class="modal-title"
                                            id="staticBackdropLabel{{$product->id}}">{{$product->name}}</h5>
                                        <button type="button" class="btn-close" data-bs-dismiss="modal"
                                                aria-label="Close"></button>
                                    </div>
                                    <div class="modal-body ">
                                        <article id="detail" class="container my-5 popreg">
                                            <div class="row">
                                                <div class="d-flex">
                                                    <div class="col-lg-6">

                                                        <img class="img-fluid" id="custommug"
                                                             src="{{$product->photo ? asset($product->photo->file) : 'http://via.placeholder.com/62'}}"
                                                             alt="customizable">
                                                    </div>
                                                    <div class="col-lg-6 text-center text-lg-start">
                                                        <h1 class="fs-3 my-3">{{$product->name}}</h1>
                                                        <p><small><span
                                                                    class="popbold">Reference: </span>{{$product->id}}
                                                            </small></p>
                                                        <p class="popbold fs-3 my-3">&#8364; {{$product->price}}</p>
                                                        <p class="fs-6">{{$product->description}}</p>
                                                        <hr>

                                                        <div id="detailaddtocart" class="row my-2">

                                                            <div id="mainDiv" class="col-lg-3 my-lg-2 col-4 ">
                                                                <button id="minus">-</button>
                                                                <span id="numberPlace">0</span>
                                                                <button id="plus">+</button>
                                                            </div>
                                                            <div class="col-lg-9 col-8 ">
                                                                <button id="submit"
                                                                        class="btn btn-danger add-to-cart my-lg-2"
                                                                        data-button-action="add-to-cart" type="submit">
                                                                    <i class="bi bi-plus-circle"></i>
                                                                    Add to cart
                                                                </button>
                                                            </div>
                                                        </div>
                                                        <div class="row my-3 ">
                                                            <div class="col-lg-4 col-6"><i
                                                                    class="bi bi-suit-heart me-lg-2"></i><a
                                                                    id="detailwish" href="#">Add to wishlist</a></div>
                                                            <div class="col-lg-8 col-6"><i
                                                                    class="bi bi-arrow-clockwise me-lg-2  text-black"></i><a
                                                                    id="detailcompare" href="#">Add to compare</a></div>
                                                        </div>
                                                        <div class="row">
                                                            <div class="col-lg-12 fs-4">
                                                                <p class="popbold">Share</p>
                                                                <a id="facebook" href="#"><i
                                                                        class=" bi bi-facebook mx-2 "></i></a>
                                                                <a id="twitter" href="#"><i
                                                                        class="bi bi-twitter mx-2 "></i></a>
                                                                <a id="google" href="#"><i
                                                                        class="bi bi-google mx-2 "></i></a>
                                                                <a id="instagram" href="#"><i
                                                                        class="bi bi-instagram mx-2 "></i></a>
                                                            </div>
                                                        </div>

                                                    </div>
                                                </div>
                                            </div>
                                        </article>
                                    </div>
                                </div>
                            </div>

                        </div>
                    </div>
                    <p class="discountbtn">{{$product->brand->name}}</p>
                    <p class="new">{{$product->category->name}}</p>
                </div>
            </div>
        </article>
    @endforeach
@endsection

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