Jquery - How to check, if child in hidden DIV is visible?

Answer 1

You could check the display property of the css:

if ($("#two_child").css("display") != "none") {
    //...
}

As Gaby points out in the comments, this would not work if your elements are being hidden using visibility, so you may want to extend it to:

var $child = $("#two_child");
if ($child.css("display") != "none" && $child.css("visibility") != "hidden") {
    //...
}