Javascript、idセレクタ取得してもコンソールに反映されない

販売手数料計算で販売価格のidを取得しコンソール上に反映させたいが出てこない。
リロードするとokが出る為つながっているとは思うのですがなぜかnullと出ています
ご教授お願いします

javascript
1// This file is automatically compiled by Webpack, along with any other files
2// present in this directory. You're encouraged to place your actual application logic in
3// a relevant structure within app/javascript and only use these pack files to reference
4// that code so it'll be compiled.
5
6require("@rails/ujs").start()
7require("turbolinks").start()
8require("@rails/activestorage").start()
9require("channels")
10require("packs/item_price");
11
12
13// Uncomment to copy all static images under ../images to the output folder and reference
14// them with the image_pack_tag helper in views (e.g <%= image_pack_tag 'rails.png' %>)
15// or the `imagePath` JavaScript helper below.
16//
17// const images = require.context('../images', true)
18// const imagePath = (name) => images(name, true)

javascript
1window.addEventListener('load', () => {
2  console.log("OK");
3});
4
5
6const priceInput = document.getElementById("item-input");
7console.log(priceInput);

rails
1    <%# 販売価格 %>
2    <div class="sell-price">
3      <div class="weight-bold-text question-text">
4        <span>販売価格<br>(¥300〜9,999,999)</span>
5        <a class="question" href="#">?</a>
6      </div>
7      <div>
8        <div class="price-content">
9          <div class="price-text">
10            <span>価格</span>
11            <span class="indispensable">必須</span>
12          </div>
13          <span class="sell-yen">¥</span>
14          <%= f.text_field :price, class:"price-input", id:"item-price", placeholder:"例）300" %>
15        </div>
16        <div class="price-content">
17          <span>販売手数料 (10%)</span>
18          <span>
19            <span id='add-tax-price'></span>円
20          </span>
21        </div>
22        <div class="price-content">
23          <span>販売利益</span>
24          <span>
25            <span id='profit'></span>円
26        </div>
27        </span>
28      </div>
29    </div>
30    <%# /販売価格 %>