v13.0.0-42 -- distribution files

examples/drawing/index.html

@@ -12,12 +12,8 @@
   </style>
   <button type="button" id="clearDrawingCanvas">Clear Drawing</button>
   <svg id="drawingCanvas" viewbox="0 0 100 100" width="100%"></svg>
-  <script src="../../y.js"></script>
+  <script src="../yjs-dist.js"></script>
-  <script src="../../../y-array/y-array.js"></script>
+  <script src="../bower_components/d3/d3.min.js"></script>
-  <script src="../../../y-map/dist/y-map.js"></script>
-  <script src="../../../y-memory/y-memory.js"></script>
-  <script src="../../../y-websockets-client/y-websockets-client.js"></script>
-  <script src="../bower_components/d3/d3.js"></script>
   <script src="./index.js"></script>
 </body>
 </html>

examples/drawing/index.js

@@ -1,84 +1,76 @@
 /* globals Y, d3 */
-'strict mode'
 
-Y({
+let y = new Y({
-  db: {
-    name: 'memory'
-  },
   connector: {
     name: 'websockets-client',
-    room: 'drawing-example',
+    url: 'http://127.0.0.1:1234',
-    url: 'localhost:1234'
+    room: 'drawing-example'
-  },
+    // maxBufferLength: 100
-  sourceDir: '/bower_components',
-  share: {
-    drawing: 'Array'
-  }
-}).then(function (y) {
-  window.yDrawing = y
-  var drawing = y.share.drawing
-  var renderPath = d3.svg.line()
-    .x(function (d) { return d[0] })
-    .y(function (d) { return d[1] })
-    .interpolate('basis')
-
-  var svg = d3.select('#drawingCanvas')
-    .call(d3.behavior.drag()
-      .on('dragstart', dragstart)
-      .on('drag', drag)
-      .on('dragend', dragend))
-
-  // create line from a shared array object and update the line when the array changes
-  function drawLine (yarray) {
-    var line = svg.append('path').datum(yarray.toArray())
-    line.attr('d', renderPath)
-    yarray.observe(function (event) {
-      // we only implement insert events that are appended to the end of the array
-      event.values.forEach(function (value) {
-        line.datum().push(value)
-      })
-      line.attr('d', renderPath)
-    })
-  }
-  // call drawLine every time an array is appended
-  y.share.drawing.observe(function (event) {
-    if (event.type === 'insert') {
-      event.values.forEach(drawLine)
-    } else {
-      // just remove all elements (thats what we do anyway)
-      svg.selectAll('path').remove()
-    }
-  })
-  // draw all existing content
-  for (var i = 0; i < drawing.length; i++) {
-    drawLine(drawing.get(i))
-  }
-
-  // clear canvas on request
-  document.querySelector('#clearDrawingCanvas').onclick = function () {
-    drawing.delete(0, drawing.length)
-  }
-
-  var sharedLine = null
-  function dragstart () {
-    drawing.insert(drawing.length, [Y.Array])
-    sharedLine = drawing.get(drawing.length - 1)
-  }
-
-  // After one dragged event is recognized, we ignore them for 33ms.
-  var ignoreDrag = null
-  function drag () {
-    if (sharedLine != null && ignoreDrag == null) {
-      ignoreDrag = window.setTimeout(function () {
-        ignoreDrag = null
-      }, 33)
-      sharedLine.push([d3.mouse(this)])
-    }
-  }
-
-  function dragend () {
-    sharedLine = null
-    window.clearTimeout(ignoreDrag)
-    ignoreDrag = null
   }
 })
+
+window.yDrawing = y
+var drawing = y.define('drawing', Y.Array)
+var renderPath = d3.svg.line()
+  .x(function (d) { return d[0] })
+  .y(function (d) { return d[1] })
+  .interpolate('basic')
+
+var svg = d3.select('#drawingCanvas')
+  .call(d3.behavior.drag()
+    .on('dragstart', dragstart)
+    .on('drag', drag)
+    .on('dragend', dragend))
+
+// create line from a shared array object and update the line when the array changes
+function drawLine (yarray) {
+  var line = svg.append('path').datum(yarray.toArray())
+  line.attr('d', renderPath)
+  yarray.observe(function (event) {
+    line.remove()
+    line = svg.append('path').datum(yarray.toArray())
+    line.attr('d', renderPath)
+  })
+}
+// call drawLine every time an array is appended
+drawing.observe(function (event) {
+  event.removedElements.forEach(function () {
+    // if one is deleted, all will be deleted!!
+    svg.selectAll('path').remove()
+  })
+  event.addedElements.forEach(function (path) {
+    drawLine(path)
+  })
+})
+// draw all existing content
+for (var i = 0; i < drawing.length; i++) {
+  drawLine(drawing.get(i))
+}
+
+// clear canvas on request
+document.querySelector('#clearDrawingCanvas').onclick = function () {
+  drawing.delete(0, drawing.length)
+}
+
+var sharedLine = null
+function dragstart () {
+  drawing.insert(drawing.length, [Y.Array])
+  sharedLine = drawing.get(drawing.length - 1)
+}
+
+// After one dragged event is recognized, we ignore them for 33ms.
+var ignoreDrag = null
+function drag () {
+  if (sharedLine != null && ignoreDrag == null) {
+    ignoreDrag = window.setTimeout(function () {
+      ignoreDrag = null
+    }, 10)
+    sharedLine.push([d3.mouse(this)])
+  }
+}
+
+function dragend () {
+  sharedLine = null
+  window.clearTimeout(ignoreDrag)
+  ignoreDrag = null
+}

examples/html-editor-drawing-hook/index.html

@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+</head>
+  <script src="../yjs-dist.js"></script>
+  <script src="../bower_components/d3/d3.min.js"></script>
+  <script src="./index.js"></script>
+  <style>
+    magic-drawing .drawingCanvas path {
+      fill: none;
+      stroke: blue;
+      stroke-width: 2px;
+      stroke-linejoin: round;
+      stroke-linecap: round;
+    }
+    magic-drawing .drawingCanvas {
+      width: 500px;
+      height: 500px;
+      cursor: default;
+      padding:1px;
+      border:1px solid #021a40;
+    }
+    magic-drawing .clearDrawingButton {
+      position: absolute;
+      top: 0;
+      left: 0;
+    }
+    magic-drawing {
+      position: relative;
+      display: block;
+    }
+  </style>
+</head>
+<body contenteditable="true">
+</body>
+</html>

examples/html-editor-drawing-hook/index.js

@@ -0,0 +1,134 @@
+/* global Y, d3 */
+
+window.onload = function () {
+  window.yXmlType.bindToDom(document.body)
+}
+
+window.addMagicDrawing = function addMagicDrawing () {
+  let mt = document.createElement('magic-drawing')
+  mt.dataset.yjsHook = 'magic-drawing'
+  document.body.append(mt)
+}
+
+var renderPath = d3.svg.line()
+  .x(function (d) { return d[0] })
+  .y(function (d) { return d[1] })
+  .interpolate('basic')
+
+function initDrawingBindings (type, dom) {
+  dom.contentEditable = 'false'
+  dom.dataset.yjsHook = 'magic-drawing'
+  var drawing = type.get('drawing')
+  if (drawing === undefined) {
+    drawing = type.set('drawing', new Y.Array())
+  }
+  var canvas = dom.querySelector('.drawingCanvas')
+  if (canvas == null) {
+    canvas = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
+    canvas.setAttribute('class', 'drawingCanvas')
+    canvas.setAttribute('viewbox', '0 0 100 100')
+    dom.insertBefore(canvas, null)
+  }
+  var clearDrawingButton = dom.querySelector('.clearDrawingButton')
+  if (clearDrawingButton == null) {
+    clearDrawingButton = document.createElement('button')
+    clearDrawingButton.setAttribute('type', 'button')
+    clearDrawingButton.setAttribute('class', 'clearDrawingButton')
+    clearDrawingButton.innerText = 'Clear Drawing'
+    dom.insertBefore(clearDrawingButton, null)
+  }
+  var svg = d3.select(canvas)
+    .call(d3.behavior.drag()
+      .on('dragstart', dragstart)
+      .on('drag', drag)
+      .on('dragend', dragend))
+  // create line from a shared array object and update the line when the array changes
+  function drawLine (yarray, svg) {
+    var line = svg.append('path').datum(yarray.toArray())
+    line.attr('d', renderPath)
+    yarray.observe(function (event) {
+      line.remove()
+      line = svg.append('path').datum(yarray.toArray())
+      line.attr('d', renderPath)
+    })
+  }
+  // call drawLine every time an array is appended
+  drawing.observe(function (event) {
+    event.removedElements.forEach(function () {
+      // if one is deleted, all will be deleted!!
+      svg.selectAll('path').remove()
+    })
+    event.addedElements.forEach(function (path) {
+      drawLine(path, svg)
+    })
+  })
+  // draw all existing content
+  for (var i = 0; i < drawing.length; i++) {
+    drawLine(drawing.get(i), svg)
+  }
+
+  // clear canvas on request
+  clearDrawingButton.onclick = function () {
+    drawing.delete(0, drawing.length)
+  }
+
+  var sharedLine = null
+  function dragstart () {
+    drawing.insert(drawing.length, [Y.Array])
+    sharedLine = drawing.get(drawing.length - 1)
+  }
+
+  // After one dragged event is recognized, we ignore them for 33ms.
+  var ignoreDrag = null
+  function drag () {
+    if (sharedLine != null && ignoreDrag == null) {
+      ignoreDrag = window.setTimeout(function () {
+        ignoreDrag = null
+      }, 10)
+      sharedLine.push([d3.mouse(this)])
+    }
+  }
+
+  function dragend () {
+    sharedLine = null
+    window.clearTimeout(ignoreDrag)
+    ignoreDrag = null
+  }
+}
+
+Y.XmlHook.addHook('magic-drawing', {
+  fillType: function (dom, type) {
+    initDrawingBindings(type, dom)
+  },
+  createDom: function (type) {
+    const dom = document.createElement('magic-drawing')
+    initDrawingBindings(type, dom)
+    return dom
+  }
+})
+
+// initialize a shared object. This function call returns a promise!
+let y = new Y({
+  connector: {
+    name: 'websockets-client',
+    url: 'http://127.0.0.1:1234',
+    room: 'html-editor-example6'
+    // maxBufferLength: 100
+  }
+})
+window.yXml = y
+window.yXmlType = y.define('xml', Y.XmlFragment)
+window.undoManager = new Y.utils.UndoManager(window.yXmlType, {
+  captureTimeout: 500
+})
+
+document.onkeydown = function interceptUndoRedo (e) {
+  if (e.keyCode === 90 && e.metaKey) {
+    if (!e.shiftKey) {
+      window.undoManager.undo()
+    } else {
+      window.undoManager.redo()
+    }
+    e.preventDefault()
+  }
+}

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "yjs",
-  "version": "13.0.0-32",
+  "version": "13.0.0-42",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yjs",
-  "version": "13.0.0-36",
+  "version": "13.0.0-42",
   "description": "A framework for real-time p2p shared editing on any data",
   "main": "./y.node.js",
   "browser": "./y.js",

rollup.test.js

@@ -3,7 +3,7 @@ import commonjs from 'rollup-plugin-commonjs'
 import multiEntry from 'rollup-plugin-multi-entry'
 
 export default {
-  input: 'test/y-xml.tests.js',
+  input: 'test/*.tests.js',
   name: 'y-tests',
   sourcemap: true,
   output: {

src/Type/YArray.js

@@ -5,15 +5,38 @@ import { logID } from '../MessageHandler/messageToString.js'
 import YEvent from '../Util/YEvent.js'
 
 class YArrayEvent extends YEvent {
-  constructor (yarray, remote) {
+  constructor (yarray, remote, transaction) {
     super(yarray)
     this.remote = remote
+    this._transaction = transaction
+  }
+  get addedElements () {
+    const target = this.target
+    const transaction = this._transaction
+    const addedElements = new Set()
+    transaction.newTypes.forEach(function (type) {
+      if (type._parent === target && !transaction.deletedStructs.has(type)) {
+        addedElements.add(type)
+      }
+    })
+    return addedElements
+  }
+  get removedElements () {
+    const target = this.target
+    const transaction = this._transaction
+    const removedElements = new Set()
+    transaction.deletedStructs.forEach(function (struct) {
+      if (struct._parent === target && !transaction.newTypes.has(struct)) {
+        removedElements.add(struct)
+      }
+    })
+    return removedElements
   }
 }
 
 export default class YArray extends Type {
   _callObserver (transaction, parentSubs, remote) {
-    this._callEventHandler(transaction, new YArrayEvent(this, remote))
+    this._callEventHandler(transaction, new YArrayEvent(this, remote, transaction))
   }
   get (pos) {
     let n = this._start
@@ -184,8 +207,12 @@ export default class YArray extends Type {
           prevJsonIns._content.push(c)
         }
       }
-      if (prevJsonIns !== null && y !== null) {
+      if (prevJsonIns !== null) {
-        prevJsonIns._integrate(y)
+        if (y !== null) {
+          prevJsonIns._integrate(y)
+        } else if (prevJsonIns._left === null) {
+          this._start = prevJsonIns
+        }
       }
     })
   }
@@ -214,6 +241,17 @@ export default class YArray extends Type {
     }
     this.insertAfter(left, content)
   }
+  push (content) {
+    let n = this._start
+    let lastUndeleted = null
+    while (n !== null) {
+      if (!n._deleted) {
+        lastUndeleted = n
+      }
+      n = n._right
+    }
+    this.insertAfter(lastUndeleted, content)
+  }
   _logString () {
     const left = this._left !== null ? this._left._lastId : null
     const origin = this._origin !== null ? this._origin._lastId : null

src/Type/YText.js

@@ -29,14 +29,17 @@ export default class YText extends YArray {
       let right = this._start
       let count = 0
       while (right !== null) {
-        if (count <= pos && pos < count + right._length) {
+        const rightLen = right._deleted ? 0 : (right._length - 1)
+        if (count <= pos && pos <= count + rightLen) {
           const splitDiff = pos - count
-          right = right._splitAt(this._y, pos - count)
+          right = right._splitAt(this._y, splitDiff)
           left = right._left
           count += splitDiff
           break
         }
-        count += right._length
+        if (!right._deleted) {
+          count += right._length
+        }
         left = right
         right = right._right
       }

src/Type/y-xml/YXmlFragment.js

@@ -17,7 +17,7 @@ function domToYXml (parent, doms, _document) {
     }
     if (parent._domFilter(d.nodeName, new Map()) !== null) {
       let type
-      const hookName = d._yjsHook
+      const hookName = d._yjsHook || (d.dataset != null ? d.dataset.yjsHook : undefined)
       if (hookName !== undefined) {
         type = new YXmlHook(hookName, d)
       } else if (d.nodeType === d.TEXT_NODE) {
@@ -55,7 +55,7 @@ class YXmlTreeWalker {
       }
     }
     do {
-      if (!n._deleted && n.constructor === YXmlFragment._YXmlElement && n._start !== null) {
+      if (!n._deleted && (n.constructor === YXmlFragment._YXmlElement || n.constructor === YXmlFragment) && n._start !== null) {
         // walk down in the tree
         n = n._start
       } else {

src/Type/y-xml/YXmlHook.js

@@ -24,6 +24,11 @@ export default class YXmlHook extends YMap {
     }
     return this._dom
   }
+  _unbindFromDom () {
+    this._dom._yxml = null
+    this._yxml = null
+    // TODO: cleanup hook?
+  }
   _fromBinary (y, decoder) {
     const missing = super._fromBinary(y, decoder)
     this.hookName = decoder.readVarString()

src/Type/y-xml/selection.js

@@ -68,7 +68,6 @@ export function afterTransactionSelectionFixer (y, transaction, remote) {
     }
   }
   if (shouldUpdate) {
-    console.info('updating selection!!')
     browserSelection.setBaseAndExtent(
       anchorNode,
       anchorOffset,
@@ -76,7 +75,4 @@ export function afterTransactionSelectionFixer (y, transaction, remote) {
       focusOffset
     )
   }
-  // delete, so the objects can be gc'd
-  relativeSelection = null
-  browserSelection = null
 }

src/Type/y-xml/utils.js

@@ -174,7 +174,7 @@ export function reflectChangesOnDom (events, _document) {
         // let anchorViewPosition = getAnchorViewPosition(yxml._scrollElement)
         if (yxml.constructor === YXmlText) {
           yxml._dom.nodeValue = yxml.toString()
-        } else {
+        } else if (event.attributesChanged !== undefined) {
           // update attributes
           event.attributesChanged.forEach(attributeName => {
             const value = yxml.getAttribute(attributeName)
@@ -193,19 +193,27 @@ export function reflectChangesOnDom (events, _document) {
            *       only in the attributes (above)
            */
           if (event.childListChanged && yxml.constructor !== YXmlHook) {
-            // create fragment of undeleted nodes
+            let currentChild = dom.firstChild
-            const fragment = _document.createDocumentFragment()
             yxml.forEach(function (t) {
-              fragment.appendChild(t.getDom(_document))
+              let expectedChild = t.getDom(_document)
+              if (expectedChild.parentNode === dom) {
+                // is already attached to the dom. Look for it
+                while (currentChild !== expectedChild) {
+                  let del = currentChild
+                  currentChild = currentChild.nextSibling
+                  dom.removeChild(del)
+                }
+                currentChild = currentChild.nextSibling
+              } else {
+                // this dom is not yet attached to dom
+                dom.insertBefore(expectedChild, currentChild)
+              }
             })
-            // remove remainding nodes
+            while (currentChild !== null) {
-            let lastChild = dom.lastChild
+              let tmp = currentChild.nextSibling
-            while (lastChild !== null) {
+              dom.removeChild(currentChild)
-              dom.removeChild(lastChild)
+              currentChild = tmp
-              lastChild = dom.lastChild
             }
-            // insert fragment of undeleted nodes
-            dom.appendChild(fragment)
           }
         }
         /* TODO: smartscrolling

test/y-xml.tests.js

@@ -280,7 +280,6 @@ test('deep element insert', async function xml16 (t) {
   deepElement.append(boldElement)
   deepElement.append(attrElement)
   dom0.append(deepElement)
-  console.log(dom0.outerHTML)
   let str0 = dom0.outerHTML
   await flushAll(t, users)
   let str1 = dom1.outerHTML
@@ -340,7 +339,6 @@ test('Filtering remote changes', async function xmlFilteringRemote (t) {
   // check dom
   paragraph.getDom().setAttribute('malicious', 'true')
   span.getDom().setAttribute('malicious', 'true')
-  console.log(xml0.toString())
   // check incoming attributes
   xml1.get(0).get(0).setAttribute('malicious', 'true')
   xml1.insert(0, [new Y.XmlElement('hideMe')])

y.node.js

@@ -1,7 +1,7 @@
 
 /**
  * yjs - A framework for real-time p2p shared editing on any data
- * @version v13.0.0-36
+ * @version v13.0.0-42
  * @license MIT
  */
 
@@ -2204,15 +2204,38 @@ class YEvent {
 }
 
 class YArrayEvent extends YEvent {
-  constructor (yarray, remote) {
+  constructor (yarray, remote, transaction) {
     super(yarray);
     this.remote = remote;
+    this._transaction = transaction;
+  }
+  get addedElements () {
+    const target = this.target;
+    const transaction = this._transaction;
+    const addedElements = new Set();
+    transaction.newTypes.forEach(function (type) {
+      if (type._parent === target && !transaction.deletedStructs.has(type)) {
+        addedElements.add(type);
+      }
+    });
+    return addedElements
+  }
+  get removedElements () {
+    const target = this.target;
+    const transaction = this._transaction;
+    const removedElements = new Set();
+    transaction.deletedStructs.forEach(function (struct) {
+      if (struct._parent === target && !transaction.newTypes.has(struct)) {
+        removedElements.add(struct);
+      }
+    });
+    return removedElements
   }
 }
 
 class YArray extends Type {
   _callObserver (transaction, parentSubs, remote) {
-    this._callEventHandler(transaction, new YArrayEvent(this, remote));
+    this._callEventHandler(transaction, new YArrayEvent(this, remote, transaction));
   }
   get (pos) {
     let n = this._start;
@@ -2383,8 +2406,12 @@ class YArray extends Type {
           prevJsonIns._content.push(c);
         }
       }
-      if (prevJsonIns !== null && y !== null) {
+      if (prevJsonIns !== null) {
-        prevJsonIns._integrate(y);
+        if (y !== null) {
+          prevJsonIns._integrate(y);
+        } else if (prevJsonIns._left === null) {
+          this._start = prevJsonIns;
+        }
       }
     });
   }
@@ -2413,6 +2440,17 @@ class YArray extends Type {
     }
     this.insertAfter(left, content);
   }
+  push (content) {
+    let n = this._start;
+    let lastUndeleted = null;
+    while (n !== null) {
+      if (!n._deleted) {
+        lastUndeleted = n;
+      }
+      n = n._right;
+    }
+    this.insertAfter(lastUndeleted, content);
+  }
   _logString () {
     const left = this._left !== null ? this._left._lastId : null;
     const origin = this._origin !== null ? this._origin._lastId : null;
@@ -2556,14 +2594,17 @@ class YText extends YArray {
       let right = this._start;
       let count = 0;
       while (right !== null) {
-        if (count <= pos && pos < count + right._length) {
+        const rightLen = right._deleted ? 0 : (right._length - 1);
+        if (count <= pos && pos <= count + rightLen) {
           const splitDiff = pos - count;
-          right = right._splitAt(this._y, pos - count);
+          right = right._splitAt(this._y, splitDiff);
           left = right._left;
           count += splitDiff;
           break
         }
-        count += right._length;
+        if (!right._deleted) {
+          count += right._length;
+        }
         left = right;
         right = right._right;
       }
@@ -2723,7 +2764,7 @@ function reflectChangesOnDom (events, _document) {
         // let anchorViewPosition = getAnchorViewPosition(yxml._scrollElement)
         if (yxml.constructor === YXmlText) {
           yxml._dom.nodeValue = yxml.toString();
-        } else {
+        } else if (event.attributesChanged !== undefined) {
           // update attributes
           event.attributesChanged.forEach(attributeName => {
             const value = yxml.getAttribute(attributeName);
@@ -2742,19 +2783,27 @@ function reflectChangesOnDom (events, _document) {
            *       only in the attributes (above)
            */
           if (event.childListChanged && yxml.constructor !== YXmlHook) {
-            // create fragment of undeleted nodes
+            let currentChild = dom.firstChild;
-            const fragment = _document.createDocumentFragment();
             yxml.forEach(function (t) {
-              fragment.appendChild(t.getDom(_document));
+              let expectedChild = t.getDom(_document);
+              if (expectedChild.parentNode === dom) {
+                // is already attached to the dom. Look for it
+                while (currentChild !== expectedChild) {
+                  let del = currentChild;
+                  currentChild = currentChild.nextSibling;
+                  dom.removeChild(del);
+                }
+                currentChild = currentChild.nextSibling;
+              } else {
+                // this dom is not yet attached to dom
+                dom.insertBefore(expectedChild, currentChild);
+              }
             });
-            // remove remainding nodes
+            while (currentChild !== null) {
-            let lastChild = dom.lastChild;
+              let tmp = currentChild.nextSibling;
-            while (lastChild !== null) {
+              dom.removeChild(currentChild);
-              dom.removeChild(lastChild);
+              currentChild = tmp;
-              lastChild = dom.lastChild;
             }
-            // insert fragment of undeleted nodes
-            dom.appendChild(fragment);
           }
         }
         /* TODO: smartscrolling
@@ -2936,7 +2985,6 @@ function afterTransactionSelectionFixer (y, transaction, remote) {
     }
   }
   if (shouldUpdate) {
-    console.info('updating selection!!');
     browserSelection.setBaseAndExtent(
       anchorNode,
       anchorOffset,
@@ -2944,9 +2992,6 @@ function afterTransactionSelectionFixer (y, transaction, remote) {
       focusOffset
     );
   }
-  // delete, so the objects can be gc'd
-  relativeSelection = null;
-  browserSelection = null;
 }
 
 class YXmlEvent extends YEvent {
@@ -3714,7 +3759,7 @@ function domToYXml (parent, doms, _document) {
     }
     if (parent._domFilter(d.nodeName, new Map()) !== null) {
       let type;
-      const hookName = d._yjsHook;
+      const hookName = d._yjsHook || (d.dataset != null ? d.dataset.yjsHook : undefined);
       if (hookName !== undefined) {
         type = new YXmlHook(hookName, d);
       } else if (d.nodeType === d.TEXT_NODE) {
@@ -3752,7 +3797,7 @@ class YXmlTreeWalker {
       }
     }
     do {
-      if (!n._deleted && n.constructor === YXmlFragment._YXmlElement && n._start !== null) {
+      if (!n._deleted && (n.constructor === YXmlFragment._YXmlElement || n.constructor === YXmlFragment) && n._start !== null) {
         // walk down in the tree
         n = n._start;
       } else {
@@ -4196,6 +4241,11 @@ class YXmlHook extends YMap {
     }
     return this._dom
   }
+  _unbindFromDom () {
+    this._dom._yxml = null;
+    this._yxml = null;
+    // TODO: cleanup hook?
+  }
   _fromBinary (y, decoder) {
     const missing = super._fromBinary(y, decoder);
     this.hookName = decoder.readVarString();