在 Bootstrap 中向下拉菜單添加開放類的問題

Question

我正在嘗試將.open類添加到.btn-group以通過執行以下操作來保持菜單打開

$('.keep-Open').on('click', function() {
        $('.btn-group').addClass('open');
 });

但它不起作用！

我不想使用

.preventDefault(); 
.stopPropagation(); 

因為這兩個停止一切，包括 chechbox 或選擇選項，所以我想為什么不在點擊事件時將open類添加到.btn-group ？ 你能告訴我為什么這不起作用嗎？

 $('.keep-Open').on('click', function() { $('.btn-group').addClass('open'); });

 body{margin:50px;} .dropdown-menu{min-width:230px;}

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <!-- Single button --> <div class="btn-group"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Action <span class="caret"></span> </button> <div class="dropdown-menu"> <div class="list-group"> <button type="button" class="list-group-item keep-Open">Cras justo odio</button> <button type="button" class="list-group-item keep-Open">Dapibus ac facilisis in</button> <button type="button" class="list-group-item keep-Open">Morbi leo risus</button> <button type="button" class="list-group-item keep-Open">Porta ac consectetur ac</button> <button type="button" class="list-group-item keep-Open">Vestibulum at eros</button> </div> </div> </div>

Answer 1

默認點擊處理程序刪除了open類，因為您不想使用停止傳播，一種解決方案是使用 timeout(async) 調用將類添加回來

 $('.keep-Open').on('click', function() { setTimeout(function() { $('.btn-group').addClass('open'); }) });

 body { margin: 50px; } .dropdown-menu { min-width: 230px; }

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <!-- Single button --> <div class="btn-group"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Action <span class="caret"></span> </button> <div class="dropdown-menu"> <div class="list-group"> <button type="button" class="list-group-item keep-Open">Cras justo odio</button> <button type="button" class="list-group-item keep-Open">Dapibus ac facilisis in</button> <button type="button" class="list-group-item keep-Open">Morbi leo risus</button> <button type="button" class="list-group-item keep-Open">Porta ac consectetur ac</button> <button type="button" class="list-group-item keep-Open">Vestibulum at eros</button> </div> </div> </div>