sandbox/add-remove.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">

  <title>add/remove</title>

  <link rel="stylesheet" href="css/examples.css" />
  <link rel="stylesheet" href="css/basics.css" />

</head>
<body>

  <h1>add/remove</h1>

  <p>
    <button id="append">Append items</button>
    <button id="prepend">Prepend items</button>
  </p>

  <div class="container">
    <div class="item w2"></div>
    <div class="item h4"></div>
    <div class="item w2"></div>
    <div class="item h4"></div>
    <div class="item"></div>
    <div class="item h2"></div>
    <div class="item w4"></div>
    <div class="item w4"></div>
    <div class="item w4"></div>
  </div>

<script src="../bower_components/get-size/get-size.js"></script>
<script src="../bower_components/desandro-matches-selector/matches-selector.js"></script>
<script src="../bower_components/ev-emitter/ev-emitter.js"></script>
<script src="../bower_components/fizzy-ui-utils/utils.js"></script>
<script src="../bower_components/outlayer/item.js"></script>
<script src="../bower_components/outlayer/outlayer.js"></script>
<script src="../js/rect.js"></script>
<script src="../js/packer.js"></script>
<script src="../js/item.js"></script>
<script src="../js/packery.js"></script>

<script src="examples.js"></script>
<script>

function getItemFragment() {
  var fragment = document.createDocumentFragment();
  var items = [];

  for ( var i=0; i < 3; i++ ) {
    var item = document.createElement('div');
    var wRand = Math.random();
    var widthClass = wRand > 0.85 ? 'w4' :
      wRand > 0.7 ? 'w2' : '';
    var hRand = Math.random();
    var heightClass = hRand > 0.85 ? 'h4' :
      hRand > 0.7 ? 'h2' : '';
    item.className = 'item ' + widthClass + ' ' + heightClass;
    fragment.appendChild( item );
    items.push( item )
  }

  return {
    items: items,
    fragment: fragment
  };
}

  var container = document.querySelector('.container');
  var pckry = window.packery7 = new Packery( container );

  var appendButton = document.querySelector('#append');

  appendButton.addEventListener( 'click', function( event ) {
    var itemFrag = getItemFragment();
    container.appendChild( itemFrag.fragment );
    pckry.appended( itemFrag.items );
  });

  var prependButton = document.querySelector('#prepend');

  prependButton.addEventListener( 'click', function( event ) {
    var itemFrag = getItemFragment();
    container.insertBefore( itemFrag.fragment, container.firstChild );
    pckry.prepended( itemFrag.items );
  });

  container.addEventListener( 'click', function( event ) {
    var elem = event.target;
    if ( !matchesSelector( elem, '.item' ) ) {
      return;
    }

    pckry.remove( elem );
    pckry.layout();
  });

</script>

</body>
</html>