check if <ul> <li> has an active link?

问题

i have

<ul>
<li class="section-title">HEADER which triggers dropdown</li>
   <li><a href="element_one">element one</a></li>
   <li><a href="element_one">element one</a></li>
   <li><a href="element_one">element one</a></li>
</ul>

i'm hiding all li-elements (except the first one) with this line:

$('#menu ul li.section-title:first-child').parent().children('li').hide();

i wonder if it's possible to query if one of those three links is active and if so nothing should hide!

is that even possible? thank you for your help!

回答1:

1. Your code will actually hide all li elements (including the first one).
   Use $('#menu ul li:not(:first-child)').hide(); to hide all but the first one..

2. For the next part (to only hide them if none is the current one) use

   var loc = window.location.href;
   var anyActive = false;
   $('#menu li a').each(function(){
       anyActive = anyActive || (this.href == loc);
   });
   
   if (!anyActive)
       $('#menu ul li:not(:first-child)').hide();
   

Update with working code, after comment

var loc = window.location.href;

$('#menu li a').each(function(){
    if (this.href == loc)
        $(this).addClass('activelink');
});

$('#menu ul:not(:has(.activelink)) li:not(:first-child)').hide();

live example: http://jsfiddle.net/gaby/SMmtS/21/

回答2:

Why not attach a class to the active link, then you could do something like:

$(document).ready(function() { $(".myClass").doSomething();});

来源：https://stackoverflow.com/questions/3153229/check-if-ul-li-has-an-active-link