jQuery count child elements

<div id="selected">
  <ul>
    <li>29</li>
    <li>16</li>
    <li>5</li>
    <li>8</li>
    <li>10</li>
    <li>7</li>
  </ul>
</div>

I want to count the total number of <li> elements in <div id="selected"></div>. How is that possible using jQuery's .children([selector])?

You can use .length with just a descendant selector, like this:

var count = $("#selected li").length;

If you have to use .children(), then it's like this:

var count = $("#selected ul").children().length;

You can test both versions here.

$("#selected > ul > li").size()

or:

$("#selected > ul > li").length

fastest one:

$("div#selected ul li").length

var length = $('#selected ul').children('li').length
// or the same:
var length = $('#selected ul > li').length

You probably could also omit li in the children's selector.

See .length.

You can use JavaScript (don't need jQuery)

document.querySelectorAll('#selected li').length;