javascript - How can I sort elements by numerical value of data attribute?

Question

I have multiple elements with the attribute: data-percentage, is there a way of sorting the elements into ascending order with the lowest value first using either JavaScript or jQuery?

HTML:

<div class="testWrapper">
  <div class="test" data-percentage="30">
  <div class="test" data-percentage="62">
  <div class="test" data-percentage="11">
  <div class="test" data-percentage="43">
</div>

Desired result:

<div class="testWrapper">
  <div class="test" data-percentage="11">
  <div class="test" data-percentage="30">
  <div class="test" data-percentage="43">
  <div class="test" data-percentage="62">
</div>

Answer 1

Use Array.sort:

var $wrapper = $('.testWrapper');

$wrapper.find('.test').sort(function(a, b) {
    return +a.dataset.percentage - +b.dataset.percentage;
})
.appendTo($wrapper);

Here's the fiddle: http://jsfiddle.net/UdvDD/

---

If you're using IE < 10, you can't use the dataset property. Use getAttribute instead:

var $wrapper = $('.testWrapper');

$wrapper.find('.test').sort(function(a, b) {
    return +a.getAttribute('data-percentage') - +b.getAttribute('data-percentage');
})
.appendTo($wrapper);

Here's the fiddle: http://jsfiddle.net/UdvDD/1/