jquery sort list based on data attribute value

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Try to use sort() with appendTo(),

$(".listitems li").sort(sort_li) // sort elements
                  .appendTo('.listitems'); // append again to the list
// sort function callback
function sort_li(a, b){
    return ($(b).data('position')) < ($(a).data('position')) ? 1 : -1;    
}

Snippet:

$(function() {
  $(".listitems li").sort(sort_li).appendTo('.listitems');
  function sort_li(a, b) {
    return ($(b).data('position')) < ($(a).data('position')) ? 1 : -1;
  }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<ul class="listitems">
  <li data-position="3">Item 3</li>
  <li data-position="2">Item 2</li>
  <li data-position="1">Item 1</li>
  <li data-position="4">Item 4</li>
</ul>

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