twitter-bootstrap Bootstrap 4 模态中心内容
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Bootstrap 4 Modal Center Content
提问by TheOrdinaryGeek
Can someone please explain how to horizontally center the title in a Bootstrap 4 modal.
有人可以解释一下如何在 Bootstrap 4 模式中水平居中标题。
I've tried text-center, mx-autoand ml-0 / mr-0but they don't appear to work.
我试过text-center，mx-auto和ml-0 / mr-0，但他们似乎没有工作。
Here's a linkto a fiddle.
这是一个小提琴的链接。
Code below;
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">×</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>
回答by Zim
The modal-headeris display:flex so centering its' content (like the modal-title) works differently. You can use mx-autobut then centering is relative to the close button so it's not exactly centered.
的modal-header是显示：弯曲，从而围绕其内容（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，因此它不完全居中。
One option is to make the header display:block (d-block) and use text-center.
一种选择是使标题 display:block ( d-block) 并使用text-center.
https://jsfiddle.net/44v0b25k/
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">×</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>
Another option is to use w-100on the modal-titleso that it's full width, and text-centerwill also work.
另一种选择是使用w-100的modal-title，这样它的全宽，并且text-center还将工作。
<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">×</span>
</button>
</div>
回答by Pete
Below I have added text-center d-blockto the header and d-inline-blockto the title.
下面我添加text-center d-block到标题和d-inline-block标题。
The problem was that the header was flex with justify-content space-between which pushed your title to the left.
问题是标题是弹性的，中间有 justify-content 空间，这将你的标题推到了左边。
<!-- 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">×</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>回答by DavidG
Just apply CSS to the modal-titleclass, for example:
只需将 CSS 应用于modal-title类，例如：
.modal-title {
text-align: center;
width: 100%;
}
Example: https://jsfiddle.net/vxsw0xsy/
