[英]How to find out if “navbar-toggle” button is collapsed or hidden with Javascript
有沒有辦法找到JS,如果切換按鈕菜單折疊或隱藏。
class =“navbar-toggle” 或data-toggle =“collapse”是否有一個參數來指示這種狀態?
我知道顯示或隱藏“.collape”時調用的事件:
$('.navbar-collapse').on('shown.bs.collapse', function () { //called when dropdown menu is shown });
此外,我知道顯示或隱藏崩潰的方法,如下所示:
$('.navbar-collapse').collapse('hide');
但我找不到有關如何獲取.collapse當前狀態的任何信息,告訴我它是隱藏還是顯示。
(我正在以更好的方式編輯這個答案。)
是的,您可以使用jquery $(element).is(“:visible”)檢查元素是否可見
這是一些HTML
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">WebSiteName</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Page 1-1</a></li>
<li><a href="#">Page 1-2</a></li>
<li><a href="#">Page 1-3</a></li>
</ul>
</li>
<li><a href="#">Page 2</a></li>
<li><a href="#">Page 3</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>
<li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
</ul>
</div>
</div>
</nav>
<div class="container">
<h3>Collapsible Navbar</h3>
<p>In this example, the navigation bar is hidden on small screens and replaced by a button in the top right corner (try to re-size this window).
<p>Only when the button is clicked, the navigation bar will be displayed.</p>
</div>
<input type="button" value="click me" onclick="clickedIt()" />
這是一些JavaScript
function clickedIt() {
var canSee = $("#myNavbar").is(":visible");
alert(canSee);
}
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