jQuery count child elements

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;

javascript jquery dom

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

or:

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

javascript jquery dom

fastest one:

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

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