CODEWITHSUNDEEP
javascriptjquerycss
yarek
yarek

Reputation: 12064

How to show HTML Elements being sorted through animation

Here is my snippet : 

.item {
  display:inline-block;
  width:120px;
  height:120px;
  border:1px solid red;
}
<div id="listing">
  <div data-value="5" class="item">item 5</div>
  <div data-value="3" class="item">item 3</div>
  <div data-value="2" class="item">item 2</div>
  <div data-value="1" class="item">item 1</div>
  <div data-value="4" class="item">item 4</div>
</div>

I would like to sort the divs based on the value of the data-value attribute, but I want to show the items being rearranged using an animation. How can I do this?

Upvotes: 3

Views: 3984

Answers (2)

Dave
Dave

Reputation: 10924

Here's how you can animate the sort:

  1. Loop through all the elements and store their positions
  2. Position the elements absolutely at their original positions
  3. Get the position of the item that will be replaced, and animate to that position.
  4. (Optional) After the animation is complete, you may want to swap out the absolutely positioned items with regular items in sorted order, so the DOM order of the elements is correct.

function animateSort(parent, child, sortAttribute) {
  var promises = [];
  var positions = [];
  var originals = $(parent).find(child);
  var sorted = originals.toArray().sort(function(a, b) {
    // return negative for smaller, zero for equal and positive for greater
    return $(a).attr(sortAttribute) - $(b).attr(sortAttribute);
  });

  originals.each(function() {
    //store original positions
    positions.push($(this).position());
  }).each(function(originalIndex) {
    //change items to absolute position
    var $this = $(this);
    var newIndex = sorted.indexOf(this);
    sorted[newIndex] = $this.clone(); //copy the original item before messing with its positioning
    $this.css("position", "absolute").css("top", positions[originalIndex].top + "px").css("left", positions[originalIndex].left + "px");

    //animate to the new position
    var promise = $this.animate({
      top: positions[newIndex].top + "px",
      left: positions[newIndex].left + "px"
    }, 1000);
    promises.push(promise);
  });

  //instead of leaving the items out-of-order and positioned, replace them in sorted order
  $.when.apply($, promises).done(function() {
    originals.each(function(index) {
      $(this).replaceWith(sorted[index]);
    });
  });
}

$(function() {
  $("input").click(function() {
    animateSort("#listing", "div", "data-value");
  });
});
.item {
  display: inline-block;
  width: 120px;
  height: 120px;
  border: 1px solid red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<input type="button" value="Sort" />
<div id="listing">
  <div data-value="5" class="item">item 5</div>
  <div data-value="3" class="item">item 3</div>
  <div data-value="2" class="item">item 2</div>
  <div data-value="1" class="item">item 1</div>
  <div data-value="4" class="item">item 4</div>
</div>

Upvotes: 7

Rob M.
Rob M.

Reputation: 36541

Though you could easily do this without jquery, here is a (non-animated) way to sort them:

var sorted = $('#listing div').sort(function(a,b) {
   return $(a).data('value') - $(b).data('value');
});

$('#listing').html(sorted);

https://jsfiddle.net/yne89aw4/

I'll see what I can do about animating the sorting

Upvotes: 1

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