Function disconnected

index.js:145–236

(poly)

  /*! (c) Andrea Giammarchi */
  function disconnected(poly) {

    var Event = poly.Event;
    var WeakSet = poly.WeakSet;
    var notObserving = true;
    var observer = null;
    return function observe(node) {
      if (notObserving) {
        notObserving = !notObserving;
        observer = new WeakSet();
        startObserving(node.ownerDocument);
      }

      observer.add(node);
      return node;
    };

    function startObserving(document) {
      var connected = new WeakSet();
      var disconnected = new WeakSet();

      try {
        new MutationObserver(changes).observe(document, {
          subtree: true,
          childList: true
        });
      } catch (o_O) {
        var timer = 0;
        var records = [];

        var reschedule = function reschedule(record) {
          records.push(record);
          clearTimeout(timer);
          timer = setTimeout(function () {
            changes(records.splice(timer = 0, records.length));
          }, 0);
        };

        document.addEventListener('DOMNodeRemoved', function (event) {
          reschedule({
            addedNodes: [],
            removedNodes: [event.target]
          });
        }, true);
        document.addEventListener('DOMNodeInserted', function (event) {
          reschedule({
            addedNodes: [event.target],
            removedNodes: []
          });
        }, true);
      }

      function changes(records) {
        for (var record, length = records.length, i = 0; i < length; i++) {
          record = records[i];
          dispatchAll(record.removedNodes, 'disconnected', disconnected, connected);
          dispatchAll(record.addedNodes, 'connected', connected, disconnected);
        }