Bootstrap 4 模态中心内容

Question

有人可以解释如何在 Bootstrap 4 模式中水平居中标题。

我试过 text-center ， mx-auto 和 ml-0 / mr-0 但它们似乎不起作用。

这是小提琴的 链接。

下面的代码；

 <!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
  Launch demo modal
</button>

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

原文由 TheOrdinaryGeek 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

modal-header 是 display:flex，所以居中其内容（如 modal-title ）的工作方式不同。您可以使用 mx-auto 但是居中是相对于关闭按钮的，所以它并不完全居中。

一种选择是使标题显示：块 ( d-block ) 并使用 text-center 。

https://jsfiddle.net/44v0b25k/

 <div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header d-block">
        <button type="button" class="close float-right" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
        <h5 class="modal-title text-center" id="exampleModalLabel">Modal title</h5>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

另一种选择是在 w-100 modal-title 使其成为全宽，并且 text-center 也可以工作。

 <div class="modal-header">
     <h5 class="modal-title w-100 text-center" id="exampleModalLabel">Modal title</h5>
     <button type="button" class="close" data-dismiss="modal" aria-label="Close">
        <span aria-hidden="true">&times;</span>
     </button>
</div>

https://jsfiddle.net/306ob2e5/

原文由 Zim 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

下面我在标题中添加了 text-center d-block 并将 d-inline-block 添加到标题中。

问题是标题是 flex 与 justify-content space-between 把你的标题推到左边。

 <!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header text-center d-block">
        <h5 class="modal-title d-inline-block" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

示例 Bootply

原文由 Pete 发布，翻译遵循 CC BY-SA 3.0 许可协议