How may I sort a list alphabetically using jQuery?

Question

I\'m a bit out of my depth here and I\'m hoping this is actually possible.

I\'d like to be able to call a function that would sort all the items in my list alphabeti

Answer 1

@SolutionYogi's answer works like a charm, but it seems that using $.each is less straightforward and efficient than directly appending listitems :

var mylist = $('#list');
var listitems = mylist.children('li').get();

listitems.sort(function(a, b) {
   return $(a).text().toUpperCase().localeCompare($(b).text().toUpperCase());
})

mylist.empty().append(listitems);

Fiddle

Answer 2

If you are using jQuery you can do this:

$(function() {

  var $list = $("#list");

  $list.children().detach().sort(function(a, b) {
    return $(a).text().localeCompare($(b).text());
  }).appendTo($list);

});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<ul id="list">
  <li>delta</li>
  <li>cat</li>
  <li>alpha</li>
  <li>cat</li>
  <li>beta</li>
  <li>gamma</li>
  <li>gamma</li>
  <li>alpha</li>
  <li>cat</li>
  <li>delta</li>
  <li>bat</li>
  <li>cat</li>
</ul>

Note that returning 1 and -1 (or 0 and 1) from the compare function is absolutely wrong.

Answer 3

You do not need jQuery to do this...

function sortUnorderedList(ul, sortDescending) {
  if(typeof ul == "string")
    ul = document.getElementById(ul);

  // Idiot-proof, remove if you want
  if(!ul) {
    alert("The UL object is null!");
    return;
  }

  // Get the list items and setup an array for sorting
  var lis = ul.getElementsByTagName("LI");
  var vals = [];

  // Populate the array
  for(var i = 0, l = lis.length; i < l; i++)
    vals.push(lis[i].innerHTML);

  // Sort it
  vals.sort();

  // Sometimes you gotta DESC
  if(sortDescending)
    vals.reverse();

  // Change the list on the page
  for(var i = 0, l = lis.length; i < l; i++)
    lis[i].innerHTML = vals[i];
}

Easy to use...

sortUnorderedList("ID_OF_LIST");

Live Demo →

Answer 4

HTML

<ul id="list">
    <li>alpha</li>
    <li>gamma</li>
    <li>beta</li>
</ul>

JavaScript

function sort(ul) {
    var ul = document.getElementById(ul)
    var liArr = ul.children
    var arr = new Array()
    for (var i = 0; i < liArr.length; i++) {
        arr.push(liArr[i].textContent)
    }
    arr.sort()
    arr.forEach(function(content, index) {
        liArr[index].textContent = content
    })
}

sort("list")

JSFiddle Demo https://jsfiddle.net/97oo61nw/

Here we are push all values of li elements inside ul with specific id (which we provided as function argument) to array arr and sort it using sort() method which is sorted alphabetical by default. After array arr is sorted we are loop this array using forEach() method and just replace text content of all li elements with sorted content

Answer 5

$(".list li").sort(asc_sort).appendTo('.list');
//$("#debug").text("Output:");
// accending sort
function asc_sort(a, b){
    return ($(b).text()) < ($(a).text()) ? 1 : -1;    
}

// decending sort
function dec_sort(a, b){
    return ($(b).text()) > ($(a).text()) ? 1 : -1;    
}

live demo : http://jsbin.com/eculis/876/edit

Answer 6

I was looking to do this myself, and I wasnt satisfied with any of the answers provided simply because, I believe, they are quadratic time, and I need to do this on lists hundreds of items long.

I ended up extending jquery, and my solution uses jquery, but could easily be modified to use straight javascript.

I only access each item twice, and perform one linearithmic sort, so this should, I think, work out to be a lot faster on large datasets, though I freely confess I could be mistaken there:

sortList: function() {
   if (!this.is("ul") || !this.length)
      return
   else {
      var getData = function(ul) {
         var lis     = ul.find('li'),
             liData  = {
               liTexts : []
            }; 

         for(var i = 0; i<lis.length; i++){
             var key              = $(lis[i]).text().trim().toLowerCase().replace(/\s/g, ""),
             attrs                = lis[i].attributes;
             liData[key]          = {},
             liData[key]['attrs'] = {},
             liData[key]['html']  = $(lis[i]).html();

             liData.liTexts.push(key);

             for (var j = 0; j < attrs.length; j++) {
                liData[key]['attrs'][attrs[j].nodeName] = attrs[j].nodeValue;
             }
          }

          return liData;
       },

       processData = function (obj){
          var sortedTexts = obj.liTexts.sort(),
              htmlStr     = '';

          for(var i = 0; i < sortedTexts.length; i++){
             var attrsStr   = '',
                 attributes = obj[sortedTexts[i]].attrs;

             for(attr in attributes){
                var str = attr + "=\'" + attributes[attr] + "\' ";
                attrsStr += str;
             }

             htmlStr += "<li "+ attrsStr + ">" + obj[sortedTexts[i]].html+"</li>";
          }

          return htmlStr;

       };

       this.html(processData(getData(this)));
    }
}