如何获取父元素的类？

Question

I would like to find the class of the parent element of the child with .current .

 var currentli = $('.nav').find('a.current').parent().attr('class'); console.log(currentli);

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="nav"> <ul> <li class="tab1"> <a href="#1" class="current">Welcome</a> </li> <li class="tab2"> <a href="#2">About</a> </li> <!-- and some lists more --> </ul> </div>

but it always throws me undefined

NOTE: I don't know which a currently has .current which is why I have to use the .find() method.

Answer 1

Your code should already work, but it might be more reliable to access the property className instead:

 jQuery(function($) { console.log($('.nav a.current').parent().prop('className')); });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script> <div class="nav"> <ul> <li class="tab1"> <a href="#1" class="current">Welcome</a> </li> <li class="tab2"> <a href="#2">About</a> </li> <!-- and some lists more --> </ul> </div>

Answer 2

This will work:

var currentli = $($('.nav').find('a.current')).parent().attr('class');
console.log(currentli);

I'm simply transforming the found collection into a jQuery object again.

See fiddle: http://jsfiddle.net/RaphaelDDL/wnW4u/

Ps.: If more than one a has class="current" , only the first one will be retrieved.

Answer 3

 jQuery(function($) { console.log($('.nav a.current').parent().prop('className')); });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script> <div class="nav"> <ul> <li class="tab1"> <a href="#1" class="current">Welcome</a> </li> <li class="tab2"> <a href="#2">About</a> </li> <!-- and some lists more --> </ul> </div>