当代码指令是正确放置时，为什么这个弹出框会出现在按钮下方？

编程问答 2022-05-01

问题描述

当代码指令是正确放置时，为什么这个弹出框只出现在按钮下方？接下来的几句话只是为了“添加更多细节”让问题通过。

new bootstrap.Popover(document.querySelector('.example-popover'),{
  container: 'body'
})

$(document).ready(function() {
  $(".name-button").click(function(event) {
    $('.modal-header h5.modal-title').html("New message to " + $(this).attr('data-name'));
  });
})
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">

<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js" integrity="sha384-JEW9xMcG8R+pH31jmWH6WWP0WintQrMb4s7ZOdauHnUtxwoG2vI5DkLtS3qm9Ekf" crossorigin="anonymous"></script>


<!--Modal Trigger Buttons -->
<button type="button" class="name-button btn btn-primary btn-lg" data-bs-toggle="modal" data-bs-target="#exampleModal" data-name="Joe">Email Joe</button>

<button type="button" class="name-button btn btn-primary btn-lg" data-bs-toggle="modal" data-bs-target="#exampleModal" data-name="Phil">Email Phil</button>

<button type="button" class="name-button btn btn-primary btn-lg" data-bs-toggle="modal" data-bs-target="#exampleModal" data-name="Nicki">Email Nicki</button>


<!-- The Modal Itself  -->
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

<button type="button" class="btn btn-lg btn-danger example-popover" **data-bs-placement="right" ** data-bs-toggle="popover" title="Popover title" data-bs-content="And here's some amazing content. It's very engaging. Right?">Click to toggle popover</button>

解决方法

因为您没有在布局中为右侧放置留出空间。 Popper 库尝试使用您的偏好，如果它不适合，它会根据库中的算法转到其他地方，以便用户可以实际看到它。

在这里，我已将您的按钮移到了更好的位置，它按预期工作。请注意，您可以使用 fallbackPlacement 属性自行指定后备位置。 Read more

new bootstrap.Popover(document.querySelector('.example-popover'),{
  container: 'body'
})

$(document).ready(function() {
  $(".name-button").click(function(event) {
    $('.modal-header h5.modal-title').html("New message to " + $(this).attr('data-name'));
  });
})
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js" integrity="sha384-JEW9xMcG8R+pH31jmWH6WWP0WintQrMb4s7ZOdauHnUtxwoG2vI5DkLtS3qm9Ekf" crossorigin="anonymous"></script>

<button type="button" class="btn btn-lg btn-danger example-popover" **data-bs-placement="right" ** data-bs-toggle="popover" title="Popover title" data-bs-content="And here's some amazing content. It's very engaging. Right?">Click to toggle popover</button>

<!--Modal Trigger Buttons -->
<button type="button" class="name-button btn btn-primary btn-lg" data-bs-toggle="modal" data-bs-target="#exampleModal" data-name="Joe">Email Joe</button>

<button type="button" class="name-button btn btn-primary btn-lg" data-bs-toggle="modal" data-bs-target="#exampleModal" data-name="Phil">Email Phil</button>

<button type="button" class="name-button btn btn-primary btn-lg" data-bs-toggle="modal" data-bs-target="#exampleModal" data-name="Nicki">Email Nicki</button>

<!-- The Modal Itself  -->
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

bootstrap-5bootstrap-popover