无法在 Bootstrap 5 中使用 JavaScript 打开模式

Cannot get Modal in Bootstrap 5 to open up using JavaScript

我目前正在尝试使用 bootstrap 5.

创建一个加载对话框

所以我做的第一件事就是将文档中的对话框复制到我的测试中 html:

        <div class="modal fade" id="staticBackdrop" data-bs-backdrop="static" data-bs-keyboard="false" tabindex="-1" aria-labelledby="staticBackdropLabel" aria-hidden="true">
            <div class="modal-dialog" id = "waitDialog">
            <div class="modal-content">
                <div class="modal-header">
                <h5 class="modal-title" id="staticBackdropLabel">Modal title</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                </div>
                <div class="modal-body">
                   Some Stuff. 
                </div>
                <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Understood</button>
                </div>
            </div>
            </div>
        </div>  

然后我写了一点JS尝试按照文档中的说明打开它

  var myModal = document.getElementById('waitDialog');
  var modal = bootstrap.Modal.getInstance(myModal)
  modal.show();

这是直接来自 https://getbootstrap.com/docs/5.0/components/modal/#via-javascript

的文档

我不工作,因为模态为空。我做错了什么?

你的代码有两个问题。

首先,getInstance方法returns与DOM元素关联的模态实例,因为它returnsnull,这意味着模态具有没有被初始化。 还有另一种方法 getOrCreateInstance,如果找到 none (https://getbootstrap.com/docs/5.0/components/modal/#getorcreateinstance),它应该创建实例。

其次,模态元素是包含 div 且类名 modal 而不是 ID 为 waitDialog.

的元素

理想情况下,您的代码应该如下所示 https://jsfiddle.net/7m1oqc9d/3/

var myModal = document.getElementById('staticBackdrop');
var modal = bootstrap.Modal.getOrCreateInstance(myModal)
modal.show()
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"/>
  <div class="modal fade" id="staticBackdrop" data-bs-backdrop="static" data-bs-keyboard="false" tabindex="-1" aria-labelledby="staticBackdropLabel" aria-hidden="true">
            <div class="modal-dialog" id="waitDialog">
            <div class="modal-content">
                <div class="modal-header">
                <h5 class="modal-title" id="staticBackdropLabel">Modal title</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                </div>
                <div class="modal-body">
                   Some Stuff. 
                </div>
                <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Understood</button>
                </div>
            </div>
            </div>
        </div>  

首先,您缺少 new 关键字。其次,您调用 bootstrap.Modal 函数将错误 ID 的元素传递给它。

此代码有效:

var myModal = document.getElementById("staticBackdrop");
  var modal = new bootstrap.Modal(myModal);
  modal.show();