如何知道在 bootstrap 中单击了哪个菜单项

Question

我想知道在 bootstrap 菜单中单击了哪个元素。

我有一个带有下拉菜单的菜单，所以我想知道单击了哪个菜单项，我想将其存储在浏览器本地存储中，该怎么做？

我试过这个来点击菜单项，但它不起作用：

document.addEventListener('click', function(e) {
  alert(e.target.id);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">

<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a>
        </li>
        <li><a href="#">Link</a>
        </li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a>
            </li>
            <li><a href="#">Another action</a>
            </li>
            <li><a href="#">Something else here</a>
            </li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Separated link</a>
            </li>
            <li role="separator" class="divider"></li>
            <li><a href="#">One more separated link</a>
            </li>
          </ul>
        </li>
      </ul>
      <form class="navbar-form navbar-left" role="search">
        <div class="form-group">
          <input type="text" class="form-control" placeholder="Search">
        </div>
        <button type="submit" class="btn btn-default">Submit</button>
      </form>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="#">Link</a>
        </li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a>
            </li>
            <li><a href="#">Another action</a>
            </li>
            <li><a href="#">Something else here</a>
            </li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Separated link</a>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <!-- /.navbar-collapse -->
  </div>
  <!-- /.container-fluid -->
</nav>

还有如何从数据库中存储和检索它们的值？

Answer 1

首先，您必须更具体地说明要向哪些元素添加侦听器。您必须向这些元素添加特定的 class。然后你可以用 jQuery:

轻松做到这一点

$(".yourClassName"){
//$(this) will refer to the element
}

这样您就可以在本地存储中存储被点击元素的内容：

$(".yourClassName"){
    var value = $(this).text();
    var id = $(this).attr("id");
    localStorage.setItem(id , value );
    }

这样您就可以检索它们的值：

var value = localStorage.getItem(itemId);

Answer 2

为锚点添加委托点击事件到 .dropdown-menu:-

已更新fiddle

$('.dropdown-menu').on('click', 'a', function(e){
  
  // 'this' is the clicked anchor
  
  var text = this.text;
  var href = this.href;
  
  alert(text);
  
  // here add to local storage;
  
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<ul class="dropdown-menu">
  <li><a href="#">Action</a></li>
  <li><a href="#">Another action</a></li>
  <li><a href="#">Something else here</a></li>
  <li role="separator" class="divider"></li>
  <li><a href="#">Separated link</a></li>
</ul>

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