javascript - 为什么我的默认下拉选项在选择其他选项时会消失?
问题描述
我该如何解决这个问题,所以当我选择一个选项时,下拉菜单上会显示默认选项“正在观看”?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!--------------------------------------------------------------------------------------->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<title>App</title>
</head>
<body class="bg-ttgl">
<div class="container">
<form class="form-group">
<div class="search-row row justify-content-center">
<!--dropdown section-->
<div class="col-7 input-group-prepend">
<button class="btn btn-outline-secondary dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Watching</button>
<div class="dropdown-menu" role="menu">
<a class="dropdown-item">Completed</a>
<a class="dropdown-item">On-Hold</a>
<a class="dropdown-item">Dropped</a>
<a class="dropdown-item">Plan to Watch</a>
</div>
<!--search field section-->
<input type="text" class="form-control" aria-label="Anime list username" label="Anime list username" autocorrect="off" autocapitalize="off" placeholder="MyAnimeList username">
<div class="input-group-append" id="button-addon4">
<button class="btn btn-light btn-outline-secondary" type="submit">
<i class="fa fa-search"></i>
</button>
</div>
</div>
</div>
</form>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<script>$(".dropdown-menu a").click(function () {
$("button.dropdown-toggle").text($(this).text());
});
</script>
</body>
</html>
解决方案
那是因为 'Watching' 作为dropdown-item
. 只需添加<a class="dropdown-item">Completed</a>
到下拉菜单列表中。
例如
<div class="dropdown-menu" role="menu">
<a class="dropdown-item">Watching</a> // Here
<a class="dropdown-item">Completed</a>
<a class="dropdown-item">On-Hold</a>
<a class="dropdown-item">Dropped</a>
<a class="dropdown-item">Plan to Watch</a>
</div>
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