twitter-bootstrap 如何找出“导航栏切换”按钮是否已使用 Javascript 折叠或隐藏
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How to find out if "navbar-toggle" button is collapsed or hidden with Javascript
提问by Turpal Iliev
Is there a way to find out, with JS, if the toggle button menu is collapsed or hidden.
有没有办法用 JS 找出切换按钮菜单是否折叠或隐藏。
Does class="navbar-toggle"or data-toggle="collapse"have a parameter which indicates this state?
难道类=“导航栏拨动”或数据切换=“崩溃”有这表示在此状态下的参数？
I know the events that are called when the ".collape" is shown or hidden:
我知道显示或隐藏“.collape”时调用的事件：
$('.navbar-collapse').on('shown.bs.collapse', function () {
//called when dropdown menu is shown
});
$('.navbar-collapse').on('shown.bs.collapse', function () {
//called when dropdown menu is shown
});
Furthermore, I know the methods that shows or hides the collapse like this:
此外，我知道显示或隐藏折叠的方法，如下所示：
$('.navbar-collapse').collapse('hide');
But I can′t find any information on how to get the current status of .collapse, telling me if it′s hidden or shown.
但是我找不到任何关于如何获取 .collapse 当前状态的信息，告诉我它是隐藏还是显示。
回答by Nikki9696
(I am editing this answer with a better way.)
（我正在用更好的方式编辑这个答案。）
Yes, you can check if the element is visible, using jquery $(element).is(":visible")
是的，您可以使用 jquery $(element).is(":visible") 检查元素是否可见
Here is a live demo on jsFiddle
这是一个关于 jsFiddle的现场演示
Here is some html
这是一些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()" />
Here is some javascript
这是一些 javascript
function clickedIt() {
var canSee = $("#myNavbar").is(":visible");
alert(canSee);
}
