[英]Get the element which has class active?
I've a list. 我有一份清单。 I want to get the element of the id which has class active. 我想获得具有类活动的id的元素。
<ul class="nav nav-tabs" id="nav">
<li class="active" id="day" onclick="changeDur('day')"><a data-toggle="tab">Day</a></li>
<li id="week" onclick="changeDur('week')"><a data-toggle="tab">Week</a></li>
<li id="month" onclick="changeDur('month')"><a data-toggle="tab">Month</a></li>
<li id="year" onclick="changeDur('year')"><a data-toggle="tab">Year</a></li>
</ul>
Here's what I'm trying? 这是我正在尝试的?
var period_val = $("#nav.active").attr('id');
alert(period_val)
It gives me undefined
. 它给了我undefined
。
Where I'm going wrong? 我哪里错了?
var period_val = $("#nav .active").attr('id');
您需要一个空间来选择后代元素。
var period_val = $("#nav .active").attr('id');
- needs a space after "#nav", otherwise you're looking for an UL which has id "nav" and class "active" - 在“#nav”之后需要一个空格,否则你正在寻找一个具有id“nav”和类“active”的UL
A child selector, as mentioned above would do as well. 如上所述,子选择器也可以。
Just to make my post a bit more usefull here are the links: 只是为了使我的帖子更有用,这里是链接:
您还可以使用子选择器 >
:
var period_val = $("#nav > .active").attr("id");
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