Bootstrap 4 模态中心内容
[英] Bootstrap 4 Modal Center Content
本文介绍了Bootstrap 4 模态中心内容的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
谁能解释一下如何在 Bootstrap 4 模式中水平居中标题.
我试过 text-center、mx-auto 和 ml-0/mr-0 但它们似乎没有工作.
这是一个链接到小提琴.
下面的代码；
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">启动演示模式<!-- 模态--><div class="modalfade" 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">模态标题</h5><button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span>
<div class="modal-body">...
<div class="modal-footer"><button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button><button type="button" class="btn btn-primary">保存更改</button>
解决方案
modal-header 是 display:flex 所以它的内容居中(就像 modal-title) 的工作方式不同.您可以使用 mx-auto 但居中是相对于关闭按钮的，因此它不是完全居中.
一种选择是让标题显示:block (d-block) 并使用 text-center.
https://jsfiddle.net/44v0b25k/
<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><h5 class="modal-title text-center" id="exampleModalLabel">模态标题</h5>
<div class="modal-body">...
<div class="modal-footer"><button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button><button type="button" class="btn btn-primary">保存更改</button>
另一种选择是在 modal-title 上使用 w-100 使其全宽，并且 text-center 也可以使用.
https://jsfiddle.net/306ob2e5/
Can someone please explain how to horizontally center the title in a Bootstrap 4 modal.
I've tried text-center, mx-auto and ml-0 / mr-0 but they don't appear to work.
Here's a link to a fiddle.
Code below;
<!-- 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>
解决方案
The modal-header is display:flex so centering its' content (like the modal-title) works differently. You can use mx-auto but then centering is relative to the close button so it's not exactly centered.
One option is to make the header display:block (d-block) and use 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">×</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-100 on the modal-title so that it's full width, and text-center will also work.
<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>
https://jsfiddle.net/306ob2e5/
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