模态弹出并带有EJS和Express

Question

因此，首先，我是后端的新手，也许有些困惑，我有一个项目，所以我的困惑是如何连接它：

modal.ejs

<div class="modal fade text-black" id="Modal" tabindex="-1" aria-labelledby="ModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-dialog-centered">
        <div class="modal-content position-relative">
            <div class="modal-body">
                <button type="button"
                    class="btn-close position-absolute top-50 end-0 translate-middle btn-danger rounded-circle"
                    data-bs-dismiss="modal" aria-label="Close"></button>
                <% if(true) { %>
                    data accepted
                <% }else{ %>
                    data rejected
                <% } %>
            </div>
        </div>
    </div>
</div>

index.html零件表格

<form class="col-lg-4 col-lg-offset-4 form-inline justify-content-center" action="/" method="post">
            <input class="form-control mt-2" id="input" type="text" placeholder="Name of company" name="companyName">
            <input class="form-control mt-3" id="input" type="search" placeholder="https://www.company.com/" name="website">    
            <button type="submit" id="button" class="btn btn-primary mt-4 px-4" data-bs-toggle="modal" data-bs-target="#Modal">Check</button>
        </form>
    </div>

有效了，但是弹出窗口没有出现，而是出现了一个新页面

app.js

app.post("/", function (req, res) {
  const url = {
    name: req.body.companyName,
    link: req.body.website,
  };

  Url.findOne({ website: url.link }, function (err, foundCompany) {
    if (foundCompany) {
      console.log("found in db");
      // res.redirect("/accepted");
      res.render("modal");
    } else {
      const newUrl = new Url({
        name: url.name,
        website: url.link,
      });

      newUrl.save();

      console.log("not found in db");
      // res.redirect("/notaccepted");
    }
  });
});

如何使服务器显示数据库的检查结果？
如果找到数据=＆gt;找到的数据
else =＆gt;找不到数据