如何处理Selenium Webdriver中的两个弹出窗口？

Question

我遇到的情况是，当我单击页面元素时，它会显示一个弹出窗口，而当我单击当前弹出窗口的元素时，它会显示另一个带有“取消”和“删除”按钮的弹出窗口。在第一个弹出窗口中，我可以单击而无需切换，但是我不能单击第二个弹出窗口。

我得到的错误-

  

没有此类警报

我使用的代码-

driver.switchTo().alert().accept();

并且切换帧代码也不起作用。

这是html-

class="modal-backdrop in"></div>
<div class="modal in" id="headingDeletionConfirmationModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" style="display: block;">
    div class="modal-dialog" role="document">
        <form action="http://ad.ad.co.in/Assessment/deleteCoscholasticHeading" method="post">
            <input type="hidden" id="heading_Id" value="48" name="heading_Id"> <input type="hidden" id="class_Id" value="7" name="class_Id"> <input type="hidden" id="year_Id" value="20" name="year_id">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">×</span>
                    </button>
                    <h4 class="modal-title" id="myModalLabel">Are you sure you want to
                        delete this Heading ?</h4>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                    <button type="submit" class="btn btn-primary">Delete</button>
                </div>
            </div>
        </form>
    </div>
</div>
<div class="modal-dialog" role="document">
        <form action="http://admin.ad.co.in/Assessment/deleteCoscholasticHeading" method="post">
            <input type="hidden" id="heading_Id" value="48" name="heading_Id"> <input type="hidden" id="class_Id" value="7" name="class_Id"> <input type="hidden" id="year_Id" value="20" name="year_id">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                        <span aria-hidden="true">×</span>
                    </button>
                    <h4 class="modal-title" id="myModalLabel">Are you sure you want to
                        delete this Heading ?</h4>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                    <button type="submit" class="btn btn-primary">Delete</button>
                </div>
            </div>
        </form>
    </div>

有帮助吗？