Html 引导模式未正确居中显示

嗨，我想弄明白为什么这个模态是这样显示的。我遵循的代码是从bootstrap网站复制的。 给你

<button type="button" class="btn btn-info btn-lg" (click)="showPerformedActivityModal()">Show Performed Activities</button>

<!--Modal -->
<div class="container">
  <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true"
  [ngStyle]="{'display': myModalIsOpen ? 'block' : 'none', 'opacity': 5}">
    <div class="modal-dialog modal-dialog-centered" 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">
          <app-table [config]="config" [columns]="columns" [entity]="entity" [sort]="sort" [sortOrder]="sortOrder">
          </app-table>
        </div>

        <div class="modal-footer">
          <button type="button" class="btn btn-primary" (click)="refreshResources()">Select Activities</button>
          <button type="button" class="btn btn-default" (click)="closeModal()">Close</button>
        </div>
      </div>

    </div>
  </div>
</div>

显示已执行的活动
情态标题
&时代；
选择活动
接近

这就是工作：

您需要使用新的DIV和自定义CSS，通过“垂直对齐中心”更改类“以模态对话框为中心”

HTML

<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">Launch demo modal</button>

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="vertical-alignment-helper">
    <div class="modal-dialog vertical-align-center">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
          <h4 class="modal-title" id="myModalLabel">Modal title</h4>
        </div>
        <div class="modal-body">...</div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
          <button type="button" class="btn btn-primary">Save changes</button>
        </div>
      </div>
    </div>
  </div>
</div>

---

很好的解决方案！它工作正常，你救了我的命！：-）

.vertical-alignment-helper {
display:table;
height: 100%;
width: 100%;
pointer-events:none;}

.vertical-align-center {
/* To center vertically */
display: table-cell;
vertical-align: middle;
pointer-events:none;}

.modal-content {
/* Bootstrap sets the size of the modal in the modal-dialog class, we need to inherit it */
width:inherit;
max-width:inherit; /* For Bootstrap 4 - to avoid the modal window stretching 
full width */
height:inherit;
/* To center horizontally */
margin: 0 auto;
pointer-events:all;}