NGX-bootstrap 将子模态居中

我有一个使用 ngx-bootstrap v5.6.1 的 Angular 8 应用程序，它打开一个模态，然后在某些情况下，在第一个模态之上打开第二个模态。两者都可以完美地工作，但第二个模态以屏幕为中心，而不是以屏幕下方的模态为中心。这很可能是因为我将类："modal-md modal-dialog-centered"传递到第二个模态中，但我无法找到重新定位第二个模态的方法，除了删除"居中"让它出现在顶部。

我想将第二个模态向上移动屏幕可能多 10% - 20%。这两种模态都是它们自己的独立组件，因为我想使第二个模态在整个应用程序中可重用。

这是我如何称呼模态

第一种模式：

this.bsModalRef = this.modalService.show(ModalComponent, { class: 'modal-lg', backdrop: 'static' });

第二种模式：

this.bsModalRefConf = this.modalService.show(ConfirmModalComponent, { class: 'modal-md modal-dialog-centered', backdrop: 'static' });

它们都使用来自ngx-bootstrap/modal的BsModalService。

谢谢！

将.modal-dialog-centered也应用于大模态，并且要向上移动较小的模态，请为其.modal-content提供下边距。它的大小必须翻倍，因为它是使用 flexbox 居中的。因此，要将其向上移动15vh(设备屏幕高度的15%(，您需要30vh的底部边距。

查看它的工作(在扩展模式下(：

#exampleModalCenter2 .modal-content {
margin-bottom: 30vh;
}
.modal-content {
box-shadow: 0 5px 6px -3px rgba(0,0,0,.2), 0 9px 12px 1px rgba(0,0,0,.14), 0 3px 16px 2px rgba(0,0,0,.12);
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModalCenter">
Launch first modal
</button>
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">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"  data-toggle="modal" data-target="#exampleModalCenter2">Open second modal</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="exampleModalCenter2" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered modal-md" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">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>

由于在另一个模态之上渲染背景只能使用hacky DOM操作来完成，因此我使用box-shadow直观地将它们分开。

更好的方法是在打开较小模态时更改较大模态的不透明度，并将其z-index降低1.您可以使用以下方法实现此目的：

JavaScript：根据小类是否打开动态地向大类添加一个类，并在应用该类时更改其opacity和z-index。
css：要在没有 js 的情况下做到这一点，你所要做的就是在 DOM 中将大的放在小的之后，作为兄弟姐妹，并使用~组合器。演示：

#exampleModalCenter2 .modal-content {
margin-bottom: 20vh;
}
.modal-content {
box-shadow: 0 5px 6px -3px rgba(0,0,0,.2), 0 9px 12px 1px rgba(0,0,0,.14), 0 3px 16px 2px rgba(0,0,0,.12);
}
.modal.show {
opacity: 1;
transition: opacity .3s ease-in-out;
}
.modal.show ~ .modal.show,
.modal.show ~ .modal.show * {
opacity: .5;
pointer-events: none;
z-index: 1049;
}
.modal-backdrop.show ~ .modal-backdrop.show {
opacity: 0;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModalCenter">
Launch first modal
</button>
<div class="modal fade" id="exampleModalCenter2" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered modal-md" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">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>
<div class="modal fade" id="exampleModalCenter" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true">
<div class="modal-dialog modal-dialog-centered modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLongTitle">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"  data-toggle="modal" data-target="#exampleModalCenter2">Open second modal</button>
</div>
</div>
</div>
</div>

。在这一点上，将小的向上移动变得不那么重要了。

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