当将要显示模态时，会引发Bootstrap中的show.bs.modal事件。在这里，我添加了一个脚本来生成警报-
<script>
$(document).ready(function(){
$("#button1").click(function(){
$("#newModal").modal("show");
});
$("#newModal").on('show.bs.modal', function () {
alert('The modal will be displayed now!');
});
});
</script>在上方，单击按钮即可生成模态。之后，我使用show.bs.modal事件在模态即将可见时生成警报。
以下是一个示例，演示如何在将要显示模式时在Bootstrap中触发show.bs.modal事件-
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Team</h2>
<p>The following is the result of the selections:</p>
<button type="button" class="btn btn-default btn-lg" id="button1">Result</button>
<div class="modal fade" id="newModal" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Selected Players</h4>
</div>
<div class="modal-body">
<p>Tom and Jack selected in the team.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</div>
<script>
$(document).ready(function(){
$("#button1").click(function(){
$("#newModal").modal("show");
});
$("#newModal").on('show.bs.modal', function () {
alert('The modal will be displayed now!');
});
});
</script>
</body>
</html>