jQuery sort elements using data id

Answer 1

You can use dataset property which stores all of the custom data-* attributes of an element, it returns a string, in case that you want to convert the string to a number you can use parseInt or + operator.

$('.clist div').sort(function(a,b) {
     return a.dataset.sid > b.dataset.sid;
}).appendTo('.clist');

http://jsfiddle.net/CFYnE/

And yes, your code works here, http://jsfiddle.net/f5mC9/

Edit: Please note that IE10! and below do not support the .dataset property, if you want to support all browsers you can use jQuery's .data() method instead:

$('.clist div').sort(function(a,b) {
     return $(a).data('sid') > $(b).data('sid');
}).appendTo('.clist');

Answer 2

$('.clist div').sort(function(a,b) {
     return parseInt(a.dataset.sid) - parseInt(b.dataset.sid);
}).appendTo('.clist');

Answer 3

A more generic function to sort elements using jQuery:

$.fn.sortChildren = function (sortingFunction: any) {

    return this.each(function () {
        const children = $(this).children().get();
        children.sort(sortingFunction);
        $(this).append(children);
    });

};

Usage:

$(".clist").sortChildren((a, b) => a.dataset.sid > b.dataset.sid ? 1 : -1);