Question

How to get all id of div.A that has div.collapse is visible,example:

<div class="A">
   <div id="1"></div>
   <div class="collapse"></div>
</div>
<div class="A">
   <div id="2"></div>
   <div class="collapse" style="display:none"></div>
</div>
<div class="A">
   <div id="3"></div>
   <div class="collapse"></div>
</div>

which i should get id 1 and 3.

Answer 1

Probably not the most concise way but

$('div.A div.collapse:visible').siblings('div').each(function(){
    console.log($(this).attr('id'));
});

would work for the example you posted.